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<h1>SLF4J News</h1>
<p>Please note that you can receive SLF4J related announcements by
subscribing to the <a
href="http://www.qos.ch/mailman/listinfo/announce">QOS.ch
announce</a> mailing list.
</p>
<hr noshade="noshade" size="1"/>
<h3>March 16th, 2017 - Release of SLF4J 1.7.25</h3>
<p>In slf4j-simple module, added a configuration option to
enable/disable caching of the System.out/err target. This
enhancement was requested in <a
href="https://jira.qos.ch/browse/SLF4J-395">SLF4J-395</a> by
Hervé Boutemy.
</p>
<p>Refactored several internal methods in <code>SimpleLogger</code>
in order to ease its extension. This enhancement was requested in
<a href="https://jira.qos.ch/browse/SLF4J-394">SLF4J-394</a> by
Hervé Boutemy.</p>
<p>Updates the <code>serialVersionId</code> of
<code>BasicMarker</code> in order to ease diagnosis of
serialization issues with this class.
</p>
<hr noshade="noshade" size="1"/>
<h3>February 23rd, 2017 - Release of SLF4J 1.7.24</h3>
<p>In its MANIFEST.MF file, the jcl-over-slf4j module now declares
exporting <code>org.apache.commons.logging</code> version "1.2"
instead of version "1.1.1". Otherwise, no java code has
changed. The change was requested in <a
href="https://jira.qos.ch/browse/SLF4J-383">SLF4J-383</a> reported
by Florian Kolbe and only affects OSGi environments.
</p>
<p>Fix performance bottleneck in <code>BasicMarker</code> which now
uses a <code>CopyOnWriteArray</code> instead of a
<code>Vector</code>. This problem was raised in <a
href="https://jira.qos.ch/browse/SLF4J-240">SLF4J-240</a> by Ralph
Goers.</p>
<p>CAL10N is now declared as an optional dependency of
slf4j-ext. This fixes <a
href="https://jira.qos.ch/browse/SLF4J-369">SLF4J-369</a> reported
by Matej Spiller-Muys.
</p>
<hr noshade="noshade" size="1"/>
<h3>February 15th, 2017 - Release of SLF4J 1.7.23</h3>
<p class="highlight">Update to SLF4J version 1.7.23 to enable
slf4j-log4j12 to run under Java 9.</p>
<p>When running under Java 9, log4j version 1.2.x is unable to
correctly parse the "java.version" system property. Assuming an
inccorect Java version, it proceeded to disable its MDC
functionality. The slf4j-log4j12 module shipping in this release
fixes the issue by tweaking MDC internals by reflection, allowing
log4j to run under Java 9. See also <a
href="https://jira.qos.ch/browse/SLF4J-393">SLF4J-393</a>.</p>
<p>Fixed issue <code>EventRecodingLogger</code> not saving marker
data in the event. This issue was reported in <a
href="http://jira.qos.ch/browse/SLF4J-379">SLF4J-379</a> by Manish
Soni with Jonas Neukomm providing the relevant PR.
</p>
<p>The slf4j-simple module now uses the latest reference to
System.out or System.err. In previous releases the reference was
set at the beginning and re-used. This change fixes <a
href="https://jira.qos.ch/browse/SLF4J-389">SLF4J-389</a> reported
by Igor Polevoy.</p>
<hr noshade="noshade" size="1"/>
<h3>December 13th, 2016 - Release of SLF4J 1.7.22</h3>
<p>Add support for OFF level in <code>SimpleLogger</code>. This
feature was requested in <a
href="http://jira.qos.ch/browse/SLF4J-332">SLF4J-332</a>.
</p>
<p>Allow re-initialization of <code>SimpleLogger</code> by
"friends". This change was requested in <a
href="http://jira.qos.ch/browse/SLF4J-370">SLF4J-370</a> by
Christian Schulte.
</p>
<hr noshade="noshade" size="1"/>
<h3>April 4th, 2016 - Release of SLF4J 1.7.21</h3>
<p>Fixed a memory leak due to a race-condition occurring during
SLF4J initialization. In that case, some
<code>SubstituteLogger</code> instances may continue to accumulate
log events until the JVM eventually runs out of memory. This issue
was reported in <a
href="http://jira.qos.ch/browse/SLF4J-364">SLF4J-364</a> by Jeff
Flanigan.</p>
<p><code>LoggerFactory</code> makes sure to release all resources
referenced by <code>SubstituteLoggerFactory</code>
post-initialization. See also <a
href="http://jira.qos.ch/browse/SLF4J-366">SLF4J-366</a>
</p>
<hr noshade="noshade" size="1"/>
<h3>March 29th, 2016 - Release of SLF4J 1.7.20</h3>
<p class="red">Releases 1.7.19 and 1.7.20 suffer from a <a
href="http://jira.qos.ch/browse/SLF4J-364">memory leak</a>. Please
use version 1.7.21 or later instead.</p>
<p>Fixed initialization problem encountered on the Google App
Engine platform with SLF4J version 1.7.19 but not other versions.
The problem was reported in <a
href="http://jira.qos.ch/browse/SLF4J-363">SLF4J-363</a> by Osvaldo
Pinali Doederlein.
</p>
<hr noshade="noshade" size="1"/>
<h3>March 14th, 2016 - Release of SLF4J 1.7.19</h3>
<p class="red">Releases 1.7.19 and 1.7.20 suffer from a <a
href="http://jira.qos.ch/browse/SLF4J-364">memory leak</a>. Please
use version 1.7.21 or later instead.</p>
<p>Fixed <code>NullPointerException</code> thrown by
org.slf4j.helpers.SubstituteLogger.isDelegateEventAware(SubstituteLogger.java:353). This
issue was reported by Jeffrey Zhao in <a
href="http://jira.qos.ch/browse/SLF4J-361">SLF4J-361</a>.</p>
<p>Initialization of the slf4j-log4j12 module is now thread safe
fixing <a href="http://jira.qos.ch/browse/SLF4J-358">SLF4J-358</a>.
</p>
<p>Initialization of the slf4j-jdk14 module is now thread safe
fixing <a href="http://jira.qos.ch/browse/SLF4J-359">SLF4J-359</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>26th of February, 2016 - Release of SLF4J 1.7.18</h3>
<p>Initialization of the slf4j-simple module is now thread safe
fixing <a href="http://jira.qos.ch/browse/SLF4J-356">SLF4J-356</a>.
</p>
<p>Fixed Import-Package statement in MANIFEST.MF for the
slf4j-log4j12 module. This isssue was reported by Mathieu Sebire in
<a href="jira.qos.ch/browse/SLF4J-357">SLF4J-357</a> who also
provided the relevant pull request.
</p>
<hr noshade="noshade" size="1"/>
<h3>19th of February, 2016 - Release of SLF4J 1.7.17</h3>
<p>When running under Android, skip binding ambiguity check during
initialization for better performance. The fix introduced in version 1.7.14
was not effective.
</p>
<hr noshade="noshade" size="1"/>
<h3>11th of February, 2016 - Release of SLF4J 1.7.16</h3>
<p>The <code>MANIFEST.MF</code> file in slf4j-api.jar module was
missing an export statement for the <em>org.slf4j.event</em>
package. <code>MANIFEST.MF</code> files in other modules were
missing the mirroring import statements.
</p>
<hr noshade="noshade" size="1"/>
<h3>9th of February, 2016 - Release of SLF4J 1.7.15</h3>
<p>In previous versions of SLF4J, if the application was already
multi-threaded at the time the first SLF4J logger was created, logs
made during the SLF4J initialization phase were lost. New code
added in relation with <a
href="http://jira.qos.ch/browse/SLF4J-353">SLF4J-353</a> fixes this
problem by storing and replaying logging calls made during
initialization.
</p>
<hr noshade="noshade" size="1"/>
<h3>24th of January, 2016 - Release of SLF4J 1.7.14</h3>
<p>The assignment of the INITIALIZATION_STATE variable in
<code>LoggerFactory</code> is now guaranteed to be consistent for
multi-thread initializations. More specifically, only one thread
will see INITIALIZATION_STATE as UNINITIALIZED with all other
threads observing either ONGOING_INITIALIZATION or the final result
of the initialization. However, SLF4J initialization is still
non-blocking and re-entrant, in the sense that if some thread tries
to obtain loggers during ongoing initialization by another (or
same) thread, instances of <code>SubstituteLogger</code> are
returned. This fixes <a
href="http://jira.qos.ch/browse/SLF4J-167">SLF4J-167</a>.
</p>
<p>Moved delegation check loop from <em>log4j-over-slf4j.jar</em>
to <em>slf4j-log4j12.jar</em> for better targeted loop checks. The
rationale behind the change is explained by Frans Orsel in <a
href="http://jira.qos.ch/browse/SLF4J-345">SLF4J-345</a> who also
provided the relevant pull request.
</p>
<p>During initialization the binding ambiguity check is skipped
under Android in order to improve performance. This change was
requested by Nitin Verma in <a
href="http://jira.qos.ch/browse/SLF4J-328">SLF4J-328</a> who also
provided the relevant patch.
</p>
<p>The <code>StaticMarkerBinder</code> and
<code>StaticMDCBinder</code> classes shipping in various SLF4J
bindings now offer a <code>getSingletion()</code> method. The
<code>org.slf4j.MDC</code> and <code>MarkerFactory</code> classes
now perform binding by invoking the <code>getSingleton()</code>
method first and if in the presence of an older version of SLF4J
with said method missing, then by accessing the SINGLETON
field. This backward compatible change was requested by Rufus
Alexander in <a
href="http://jira.qos.ch/browse/SLF4J-347">SLF4J-347</a> in order
to implement an SLF4J binding in Clojure, namely <a
href="https://github.com/fzakaria/slf4j-timbre">slf4j-timbre</a>.
</p>
<p>Fix the OSGI <code>Bundle-Version</code> property in the
<em>MANIFEST.MF</em> of osgi-over-slf4j module. This issue was
reported by Antoine Dessaigne in <a
href="http://jira.qos.ch/browse/SLF4J-341">SLF4J-341</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>10th of November, 2015 - Release of SLF4J 1.7.13</h3>
<p>Fixed <code>LoggerFactory</code> initialisation problem in
presence of SecurityManager denying "createSecurityManager" runtime
permission. See <a
href="http://jira.qos.ch/browse/SLF4J-324">SLF4J-324</a> for
further details.
</p>
<p>Fixed issue with <code>BasicMDCAdapter</code> leaking MDC
information to non-child threads. This problem was reported by
Lukasz Cwik in <a
href="http://jira.qos.ch/browse/SLF4J-316">SLF4J-316</a> who also
provided the relavant pull request.
</p>
<p>More robust handling of ill-formatted input strings by
SLF4JBridgeHandler. This issue was reported in <a
href="http://jira.qos.ch/browse/SLF4J-337">SLF4J-337</a> by Rodolfo
Udo Labsch.
</p>
<p>House cleaning of our project's Maven <em>pom.xml</em> files, an
initiative undertaken by Jeremy Landis.
</p>
<p>Added <code>getAdditivity()</code> method method in
<code>Category</code> class in the log4j-over-slf4j module. This
addition was requested by Milo Felipe <a
href="http://jira.qos.ch/browse/SLF4J-309">SLF4J-309</a> with
Dimitrios Liapis providing the relavant pull request.
</p>
<p>Added the <code>assertLog(boolean, String)</code> method in the
<code>Category</code> class, in module log4j-over-slf4j.</p>
<p>In the log4j-over-slf4j module, removed misplaced Layout.java
file. This issue was reported in <a
href="http://jira.qos.ch/browse/SLF4J-218">SLF4J-218</a> by Joshua
M Steward with Alfredo Ramos providing the relavant pull request.
</p>
<hr noshade="noshade" size="1"/>
<h3>March 26th, 2015 - Release of SLF4J 1.7.12</h3>
<p>All java files have been reformatted to with the code formatter
style defined in <i>codeStyle.xml</i>. This style uses 4 spaces for
indentation and a maximum line width of 160.</p>
<p>As SLF4J requires JDK 1.5 or later, the
<code>Bundle-RequiredExecutionEnvironment</code> declaration in the
various MANIFEST files have been updated to J2SE-1.5.
</p>
<p>Added missing Bundle-ManifestVersion attribute in the MANIFEST
files in log4j-over-slf4j. The issue was raised in <a
href="http://jira.qos.ch/browse/SLF4J-321">SLF4J-231</a> by Nikolas
Falco who also provided the the appropriate pull request. </p>
<p>Added <code>getAppender(String)</code> method in
<code>Category</code> class in the log4j-over-slf4j module. This
addition was requested by Ramon Gordillo in <a
href="http://jira.qos.ch/browse/SLF4J-319">SLF4J-319</a>.
</p>
<p>Added <code>setThreshold</code> method in
<code>AppenderSkeleton</code> class in the log4j-over-slf4j
module. This addition was requested by Dimitrios Liapis who also
provided the appropriate pull request.
</p>
<p>Added <code>getParent</code> method in <code>Category</code>
class in the log4j-over-slf4j module. This addition was requested
by Himanshu Bhardwaj in <a
href="http://jira.qos.ch/browse/SLF4J-318">SLF4J-318</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>6th of January, 2015 - Release of SLF4J 1.7.10</h3>
<p>The <code>MDC.putCloseable</code> method now explicitly returns
<code>MDC.MDCloseable</code> instead of the more generic
<code>java.io.Closeable</code>. This in turn allows one to write
try-with-resources statement without a catch clause. Many thanks to
William Delanoue for proposing this change.</p>
<p>The various constructors in <code>FileAppender</code> in the
log4j-over-slf4j module are now public.
</p>
<hr noshade="noshade" size="1"/>
<h3>16th of December, 2014 - Release of SLF4J 1.7.9</h3>
<p class="highlight"><a href="codes.html#loggerNameMismatch">Spot
incorrectly named loggers</a> by setting the
<code>slf4j.detectLoggerNameMismatch</code> system property to
true.</p>
<p><a href="codes.html#loggerNameMismatch">Spot incorrectly named
loggers</a> by setting the
<code>slf4j.detectLoggerNameMismatch</code> system property to
true. This significant feature was contributed by Alexander
Dorokhine.</p>
<p>Added <code>MDC.putCloseable</code> method so that it can be
used as a <a
href="https://docs.oracle.com/javase/7/docs/technotes/guides/language/try-with-resources.html">closeable
resource</a> under Java 7.</p>
<p>Added <code>getContext</code> method returning a hashtable in
org.apache.log4j.MDC in the log4j-over-slf4j module.
</p>
<p>The introduction of the @Nonnull JSR 305 annotation in SLF4J
version 1.7.8 causes the Scala compiler to fail. This is issue has
been documented in <a
href="https://issues.scala-lang.org/browse/SI-5420">SI-5420</a>. Given
that many Scala users will be affected by this issue for the
foreseeable future, we have decided to renounce the user of JSR 305
annotations in SLF4J for the time being.
</p>
<p>Numerous small code improvements too minor to be listed
here.</p>
<hr noshade="noshade" size="1"/>
<h3>4th of April, 2014 - Release of SLF4J 1.7.7 </h3>
<p>SFL4J API now uses generics. This enhancement was contributed by
Otavio Garcia. Due to erasure of generics in Java, the changes are
backward-compatible.</p>
<p>The slf4j-migrator can now convert statements using the long deprecated
<code>Category</code> class.</p>
<p>Added the <code>SimpleLayout</code> and
<code>FileAppender</code> classes to the log4j-over-slf4j
module.</p>
<h3>February 5th, 2014 - Release of SLF4J 1.7.6</h3>
<p>Added slf4j-android module to the slf4j distribution. This
module is contributed by Andrey Korzhevskiy.</p>
<p>Loggers created during the initialization phase are no longer
<code>NOPLoggers</code> which drop all logging calls. Instead,
SLF4J now creates substitute loggers which delegate to the
appropriate logger implementation after the initilization phase
completes. Only calls made to these loggers during the
initialization phase are dropped. This enhacement was proposed in
<a href="http://jira.qos.ch/browse/SLF4J-302">SLF4J-302</a>
by Chetan Mehrotra.
</p>
<p>Improvements to the <code>exit()</code> and
<code>throwing()</code> methods in <code>XLogger</code>. This
enhacement was requested in <a
href="http://jira.qos.ch/browse/SLF4J-188">SLF4J-188</a>.
</p>
<p>Concunrrency improvement in <code>MessageFormatter</code>. This
improvement was contributed by Vivek Pathak in a <a
href="https://github.com/qos-ch/slf4j/pull/52">pull
request</a>.</p>
<p>Concunrrency improvement in
<code>BasicMarkerFactory</code>. This improvement was contributed
by Mikhail Mazursky in a <a
href="https://github.com/qos-ch/slf4j/pull/40">pull
request</a>.</p>
<p><code>JCLLoggerAdapter</code> was incorrectly invoking
<code>isDebugEnabled</code> calls in its <code>trace()</code>
methods. This issue was reported in <a
href="http://jira.qos.ch/browse/SLF4J-272">SLF4J-272</a>.
</p>
<p>In the log4j-over-slf4j module, the <code>setLevel</code> method
in the <code>Category</code> class. This fixes <a
href="http://jira.qos.ch/browse/SLF4J-270">SLF4J-270</a>. Alfredo
Ramos provied the relevant patch.
</p>
<p>In the log4j-over-slf4j module, added empty implementations for
<code>OptionHander</code>, <code>WriterAppender</code>,
<code>ConsoleAppender</code> and <code>AppenderSkeleton</code>
classes.
</p>
<hr noshade="noshade" size="1"/>
<h3>25th of March, 2013 - Release of SLF4J 1.7.5</h3>
<p class="highlight">Given the significance of these performance
improvements, users are highly encouraged to migrate to SLF4J
version 1.7.5 or later. </p>
<p><span class="label notice">performance improvements</span> The
logger factories in most SLF4J modules namely in jcl-over-slf4j,
log4j-over-slf4j, slf4j-jcl, slf4j-jdk14, slf4j-log4j12, and
slf4j-simple now use a <code>ConcurrentHashMap</code> instead of a
regular <code>HashMap</code> to cache logger instances. This change
significantly improves logger retrieval times at the cost of some
memory overhead. This improvement was requested in <a
href="http://jira.qos.ch/browse/SLF4J-289">SLF4J-289</a>
by Taras Tielkes who also provided the relevant patch.
</p>
<hr noshade="noshade" size="1"/>
<h3>18th of March, 2013 - Release of SLF4J 1.7.4</h3>
<p>Added a package private <code>reset()</code> method to
<code>SimpleLoggerFactory</code> for testing purposes.</p>
<hr noshade="noshade" size="1"/>
<h3>15th of March, 2013 - Release of SLF4J 1.7.3</h3>
<p>The jul-to-slf4j bridge now correctly handles cases where the
message string contains {}-placeholders but has no or zero
parameters. This fixes <a
href="http://jira.qos.ch/browse/SLF4J-203">SLF4J-203</a>. The
relevant patch was provided by Matthew Preston in a git pull
request.</p>
<p>Added missing methods and classes in log4j-over-slf4j module for
Velocity compatibility. This issue was reported in <a
href="http://jira.qos.ch/browse/SLF4J-271">SLF4J-271</a> by
Thomas Mortagne.</p>
<hr noshade="noshade" size="1"/>
<h3>11th of October, 2012 - Release of SLF4J 1.7.2</h3>
<p>Added osgi-over-slf4j module which serves as an OSGi LogService
implementation delegating to slf4j. This module is maintained by
Matt Bishop and Libor Jelinek.</p>
<p> Christian Trutz added missing PatternLayout class as well as
several methods in the <code>Logger</code> and
<code>Category</code> classes. See commit 442e90ba5785cba9 dated
September 27th 2012 for details.
</p>
<p>Added org.slf4j.simpleLoggerwarnLevelString in slf4j-simple
module.</p>
<p>Fixed <a
href="http://jira.qos.ch/browse/SLF4J-263">SLF4J-263</a>. All
<code>Logger</code> implementations shipping with SLF4J use
<code>Object...</code> instead of <code>Object[]</code> to avoid
compiler warnings.</p>
<hr noshade="noshade" size="1"/>
<h3>14th of September, 2012 - Release of SLF4J 1.7.1</h3>
<p><a
href="apidocs/org/slf4j/impl/SimpleLogger.html"><code>SimpleLogger</code></a>
now supports writing to a file. The property names for configuring
<code>SimpleLogger</code> have been modified to be consistently in
camel case. More configuration options have been added. In the
absence of configuration directives, <code>SimpleLogger</code> will
behave exactly the same as in the past. <b>If you are one of the
few users configuring <code>SimpleLogger</code> with configuration
properties, you will need to adapt to the new and more consistent
property names.</b></p>
<hr noshade="noshade" size="1"/>
<h3>6th of September, 2012 - Release of SLF4J 1.7.0</h3>
<p><span class="bold big green">SLF4J now requires JDK 1.5.</span></p>
<p>Printing methods in the <a
href="apidocs/org/slf4j/Logger.html">Logger</a> interface now offers
variants accepting <a
href="http://docs.oracle.com/javase/1.5.0/docs/guide/language/varargs.html">varargs</a>
instead of Object[]. Given that under the hood, the Java compiler
transforms varargs into an array, this change is totally 100%
no-ifs-or-buts backward compatible with all existing client
code. </p>
<p>The logger field (of type <code>java.util.logging.Logger</code>)
in <code>JDK14LoggerAdapter</code> is now marked as transient. This
fixes <a href="http://jira.qos.ch/browse/SLF4J-252">SLF4J-252</a>,
a serialization problem reported by Thorbjørn Ravn
Andersen.</p>
<hr noshade="noshade" size="1"/>
<h3>11th of June, 2012 - Release of SLF4J 1.6.6</h3>
<p>Source repository has been moved to <a
href="https://github.com/qos-ch/slf4j">https://github.com/qos-ch/slf4j</a>
on github.</p>
<p>In case multiple bindings are found on the class path, SLF4J
will now output the name of the framework/implementation class it
binds with.</p>
<p><a
href="apidocs/org/slf4j/impl/SimpleLogger.html">SimpleLogger</a>
now supports configuration properties. </p>
<p>LoggerWrapper in the slf4j-ext module now correctly deals with
markers. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=265">bug #265</a>
reported by Dario Campagna.</p>
<p>The log4j-over-slf4j module now supports legacy projects
providing their own log4j <code>LoggerFactory</code>. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=234">bug #234</a>
reported by Laurent Pellegrino with Piotr Jagielski providing the
appropriate patch.</p>
<h3>4th of June, 2012 - Release of SLF4J 1.6.5</h3>
<p>In the slf4j-log4j12 module, upgraded the log4j dependency to
version 1.2.17.</p>
<p>Added removeHandlersForRootLogger() method to <code><a
href="apidocs/org/slf4j/bridge/SLF4JBridgeHandler.html">SLF4JBridgeHandler</a></code>
class.</p>
<p>The log4j-over-slf4j module now exports all its packages in its
manifest. This issue was reported in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=262">262</a> by
Mikhail Mazursky who also provided the relevant patch.
</p>
<h3>October 31st, 2011 - Release of SLF4J 1.6.4</h3>
<p>Fixed in thread-safety issues in <code>BasicMDCAdapter</code>
fixing <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=203">bug
#203</a> and <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=224">bug
#224</a>. Note that <code>BasicMDCAdapter</code> is only used with
the slf4j-jdk14.jar binding.
</p>
<p><code>BasicMDCAdapter</code> invoked a method introduced in JDK
1.5 preventing it from running under JDK 1.4. Interestingly enough,
this issue has never been reported by the user community.</p>
<h3>October 17th, 2011 - Release of SLF4J 1.6.3</h3>
<p><code>LogEvent</code> class in slf4j-ext module now correctly
passes the event data as a parameter object. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=246">bug #246</a>
reported by Ralph Goers.
</p>
<p>Added missing OSGi manifest to the jul-to-slf4j module. This
fixes <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=166">bug
#166</a> reported by Ekkehard Gentz. </p>
<p>In the log4j-over-slf4j module, added missing
<code>getAllAppenders</code>() method in <code>Category</code>
class. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=235">bug #235</a>
reported by Anthony Whitford.
</p>
<h3>August 19th, 2011 - Release of SLF4J 1.6.2</h3>
<p>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=138">bug
#138</a>. SLF4J will no longer complain about multiple SLF4J
bindings when running under a Weblogic server.
</p>
<p>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=228">bug
#228</a>. When running under IBM's JDK, and if no binding can be
found, SLF4J will no longer throw a
<code>NoClassDefFoundError</code>. Instead, it will default to an
NOP implementation. Under the same circumstances but with Sun's
JDK, SLF4J already defaulted to an NOP implementation since release
1.6.0.</p>
<p>Added certain missing classes to the log4j-over-slf4j module as
requested in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=225">bug 225</a> by
Josh Stewart.
</p>
<hr noshade="noshade" size="1"/>
<h3>July 5th, 2010 - Release of SLF4J 1.6.1</h3>
<p>Updated log4j dependency to version 1.2.16 and <a
href="http://cal10n.qos.ch/">CAL10N</a> dependency to version
0.7.4.
</p>
<p>Fixed missing versioning OSGi metadata in the log4j-over-slf4j
module. This problem was reported in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=187">bug 187</a> by
David Savage.
</p>
<hr noshade="noshade" size="1"/>
<h3>May 8th, 2010 - Release of SLF4J 1.6.0</h3>
<p>It is expected that <em>all</em> SLF4J releases in the 1.6.x
series will be mutually compatible.
</p>
<p>As of SLF4J version 1.6.0, in the absence of an SLF4J binding,
slf4j-api will default to a no-operation implementation discarding
all log requests. Thus, instead of throwing an exception, SLF4J
will emit a single warning message about the absence of a binding
and proceed to discard all log requests without further
protest. See also the <a href="manual.html#libraries">relevant
section</a> in the user manual.
</p>
<p>In the presence of multiple parameters and if the last argument
in a logging statement is an exception, then SLF4J will now presume
that the user wants the last argument to be treated as an exception
and not a simple parameter. See the relevant <a
href="faq.html#paramException">FAQ entry</a> for further
details. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=70">bug 70</a>
submitted by Joern Huxhorn who also provided the relevant patch.
</p>
<p>The <code>log</code> method in <code>LocationAwareLogger</code>
interface now admits an additional parameter of type
<code>Object[]</code> representing additional arguments of the log
request. Due to this modification, slf4j-api version 1.6.x will not
work with bindings shipping with SLF4J 1.5.x -- bindings shipping
with 1.6.x must be used.
</p>
<p>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=150">bug 150</a> by
implementing missing <code>resetConfiguration()</code> and
<code>shutdown()</code> methods in <code>LogManager</code> (in
log4j-over-slf4j) as nop. In addition, the
<code>getCurrentLoggers()</code> method has been implemented by
returning an empty enumeration.
</p>
<p>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=170">bug 170</a> by
a bare-bones implementation of the <code>NDC</code> class in
log4j-over-slf4j.</p>
<p>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=175">bug 175</a> by
synchronizing access to the loggerNameList field.</p>
<p>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=164">bug 164</a>
observed when SLF4J artifacts were placed under
java.endorsed.dirs.</p>
<p>Fixed sub-optimal list type usage in
<code>SLF4JLogFactory</code> as reported in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=179">bug 179</a> by
Sebastian Davids.
</p>
<p>Fixed documentation inconsistency in <code>SLF4JLog</code> as
reported in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=180">bug 180</a> by
Sebastian Davids.
</p>
<hr noshade="noshade" size="1"/>
<h3>February 25th, 2010 - Release of SLF4J 1.5.11</h3>
<p>Users yet unfamiliar with SLF4J sometimes unknowingly place both
<em>log4j-over-slf4j.jar</em> and <em>slf4j-log4j12.jar</em>
simultaneously on the class path causing stack overflow
errors. Simultaneously placing both <em>jcl-over-slf4j.jar</em> and
<em>slf4j-jcl.jar</em> on the class path, is another occurrence of
the same general problem. As of this version, SLF4J preempts the
inevitable stack overflow error by throwing an exception with
details about the actual cause of the problem. This is deemed to be
better than leaving the user wondering about the reasons of the
<code>StackOverflowError</code>.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=168">bug
168</a>. In case log4j-over-slf4j is used and a logback appender
requires a third party library which depends on log4j, the
<code>log(String FQCN, Priority p, Object msg, Throwable t)</code>
method in log4j-over-slf4j's Category class would throw an
<code>UnsupportedOperationException</code>. Problem reported by Seth
Call.</p>
<hr noshade="noshade" size="1"/>
<h3>December 3rd, 2009 - Release of SLF4J 1.5.10</h3>
<p>SLF4J version 1.5.10 consist of bug fixes and minor
enhancements. It is totally backward compatible with SLF4J version
1.5.8. However, the slf4j-ext module ships with a new package called
<code>org.slf4j.cal10n</code> which adds <a
href="localization.html">localized/internationalized logging</a>
support as a thin layer built upon the <a
href="http://cal10n.qos.ch">CAL10N API</a>.</p>
<p><a href="http://www.slf4j.org/android/">SLF4J-android</a>,
maintained by <a
href="http://dbis.cs.unibas.ch/team/thorsten-moller/dbis_staff_view">Thorsten
Möller</a>, was added as a daughter project of SLF4J.
</p>
<p>Added missing "Export-Package" declaration for cal10n in the OSGi
manifest file for sfl4j-ext. This was requested in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=156">bug 156</a> by
Pete Muir.</p>
<p>In log4j-over-slf4j, added missing log(...) methods as requested
by Zoltan Szel in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=139">bug report
139</a>.</p>
<p>In log4j-over-slf4j, added missing <code>LogManager</code> class
as requested by Rick Beton in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=150">bug report
150</a>.</p>
<p>In the slf4j-ext module, added
<code>getCopyOfChildTimeInstruments</code> and
<code>getCopyOfGlobalStopWatch</code> methods to the
<code>Profiler</code> class. This enables developers to build their
own output formatters for a given Profiler. This feature was
requested by David Lindelöf in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=141">bug 141</a>.
</p>
<p>Fixed a <code>NullPointerException</code> occurring in unspecified
conditions as described in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=146">bug report
146</a> by Dapeng Ni.</p>
<p>Added missing OSGi manifest to the <em>log4j-over-slf4j</em>
module as requested by Wade Poziombka in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=117">bug 117</a>.
</p>
<p>OSGi manifests produced by SLF4J now replace the '-' character by
'.' in compliance with the OSGi specification. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=152">bug 152</a>
according to the patch supplied by Hugues Malphettes.
</p>
<p>Fixed packaging issue in jcl104-over-slf4j which inadvertently
produced a jar file as described in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=151">bug 151</a> by
Jesse McConnell.</p>
<hr noshade="noshade" size="1"/>
<h3>June 11th, 2009 - Release of SLF4J 1.5.8</h3>
<p>SLF4J version 1.5.8 consist of bug fixes. It is totally backward
compatible with SLF4J version 1.5.7.</p>
<p>The Maven pom file for the <code>log4j-over-slf4j</code> module
contained a compile time dependency on the <code>slf4j-jdk14</code>
module. The dependency should have been declared in the test
scope. This problem was reported by Jean-Luc Geering on the slf4j
user list.
</p>
<h3>June 10th, 2009 - Release of SLF4J 1.5.7</h3>
<p>SLF4J version 1.5.7 consist of bug fixes and minor
enhancements. It is totally backward compatible with SLF4J version
1.5.6.</p>
<p>In SLF4J versions 1.5.5 and 1.5.6, the <code>LoggerFactory</code>
class which is at the core of SLF4J, if a version compatibility
issue was detected, accidentally invoked a method which was
introduced in JDK 1.5. Thus, instead of issuing a clear warning
message, SLF4J would throw a
<code>NoClassDefFoundError</code>. Consequently, SLF4J would not run
with JDK 1.4 and earlier but only if a version incompatibility issue
was present. For example, if you were mixing
<em>slf4j-api-1.5.6.jar</em> with <em>slf4j-simple-1.4.2.jar</em>,
which are mutually incompatible. Please note that this bug affects
only SLF4J versions 1.5.5 and 1.5.6 <em>and</em> only in the
presence of incompatible versions of slf4j-api and its binding.
</p>
<p>SLF4J will now emit a warning if more than one binding is present
on the class path. This enhancement was proposed in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=132">bug 132</a>
contributed by by Robert Elliot.
</p>
<p>The Log interface implementations in the jcl-over-slf4j module
will now correctly cope with serialization. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=79">bug 79</a>
reported by Mathias Bogaert. Many thanks to Eric Vargo for precisely
identifying the problem and supplying the corresponding patch.</p>
<p>The log4j-over-slf4j module will now correctly
interact with logging frameworks supporting location information
such as java.util.logging and logback. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=131">bug 131</a>
reported by Marc Zampetti.
</p>
<p><code>SLF4JBridgeHandler</code> will no longer ignore log records
with an empty message. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=108">bug 108</a>
reported by Pepijn Van Eeckhoudt and independently by Dan Lewis.
</p>
<p>In case the <code>toString()</code> method of a parameter throws
an exception, <code>MessageFormatter</code> will now print an error
message, instead of letting the exception bubble higher up as
previously. This fixes <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=112">bug 112</a>
submitted by Joern Huxhorn.
</p>
<hr noshade="noshade" size="1"/>
<h3>November 21st, 2008 - Release of SLF4J 1.5.6</h3>
<p>SLF4J version 1.5.6 consists of bug fixes. Users are encouraged
to upgrade to SLF4J version 1.5.6. The upgrade should pose no
problems. Nevertheless, you might still want to refer to the SLF4J
<a href="compatibility.html">compatibility report</a>.
</p>
<p>Fixed long standing <a
href="http://jira.qos.ch/browse/LBCLASSIC-87">LBCLASSIC-87</a> and
its younger sibling <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=113">bug
113</a>. With each call to getLogger() method,
<code>LoggerContext</code> will now retrieve the ILoggerFactory
afresh from <code>StaticLoggerBinder</code>. This change enables
context selectors of native implementations, e.g logback, to work
correctly.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=114">bug
114</a> reported by Jason Arndt. Corrected the way
<code>XLogger</code> (in slf4j-ext) passes its fully qualified class
name so that the underlying logging system can correctly compute
location information.
</p>
<p>The <code>install()</code> method of
<code>SLF4JBridgeHandler</code> will no longer reset the entire
j.u.l. environment but solely add a <code>SLF4JBridgeHandler</code>
instance to jul's root logger. By the same token, the
<code>uninstall()</code> method will remove previously added
<code>SLF4JBridgeHandler</code> instances without making any other
modifications to the j.u.l. configuration.
</p>
<p>Added <code>MDCStrLookup</code> to slf4j-ext. This class can be
used with Apache Commons Lang's <code>StrSubstitutor</code> class to
inject values in the SLF4J MDC into strings. Information on
StrSubstitutor can be found at <a
href="http://commons.apache.org/lang/api-release/org/apache/commons/lang/text/StrSubstitutor.html">StrSubstitutor
javadoc</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>October 17th, 2008 - Release of SLF4J 1.5.5</h3>
<p>The version check mechanism introduced in SLF4J 1.5.4 was
inconsistent with the large size of SLF4J's installed user base. We
cannot expect external SLF4J implementations to align their release
schedule with that of SLF4J. Consequently, this SLF4J version,
namely 1.5.5, retains versions checks but as an elective
process. For further details see the <a
href="faq.html#version_checks">relevant entry</a> in the FAQ.
</p>
<p>You are highly encouraged to upgrade to SLF4J version 1.5.5. The
upgrade should pose no problems. Nevertheless, you might still want
to refer to the SLF4J <a href="compatibility.html">compatibility
report</a>.
</p>
<h3>October 16th, 2008 - Release of SLF4J 1.5.4</h3>
<p>This version corrects critical bugs.
</p>
<p>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=106">critical bug
106</a>. In previous versions of SLF4J, if during the initial
binding phase, the underlying logging system's default configuration
created or invoked loggers, a <code>NullPointerException</code>
would be thrown. Refer to the <a
href="codes.html#substituteLogger">in error codes</a> document for a
fuller explanation.</p>
<p>At initialization time, LoggerFactory will now check that the
version of the slf4j-binding matches that of slf4j-api. If there is
a mismatch a warning will be issued on the console. This should help
users identify SLF4J related problems more quickly.</p>
<p>Improvements in documentation as well as fix for <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=102">packaging
problems</a> related to <em>slf4j-ext</em> module.
</p>
<p>SLF4JBridgeHandler (part of jul-to-slf4j) now accounts for
loggers with resourceBundle as well parameters. This feature
requested by Darryl Smith in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=98">bug 98</a> and
by Jarek Gawor in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=103">bug
103</a>.</p>
<p>We now say that markers contain <em>references</em> to other
markers. We no longer talk about child markers. The javadocs of the
<code>Marker</code> interface have been updated to reflect this
change. Moreover, the <code>hasChildren()</code> method in the
Marker interface has been deprecated and a new method called
<code>hasReferences()</code> was added.
</p>
<hr noshade="noshade" size="1"/>
<h3>September 12th, 2008 - Release of SLF4J 1.5.3</h3>
<p>See also the <a href="compatibility.html#1_5_3">compatibility
report for this version</a>.
</p>
<p>Added a new module called slf4j-ext for slf4j-extensions. See <a
href="extensions.html">its documentation</a> for further
details.</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=71">bug
71</a> which was re-opened by Manfred Geiler. SLF4J loggers now
survive serialization. By survive serialization, we mean
that the deserialized logger instance are fully functional. </p>
<p>The fix for <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=68">bug 68</a> as
implemented in version 1.5.1 was incomplete. Michael Furman supplied
a more complete fix which was incorporated in this release.</p>
<p>When slf4j bridges, e.g. jcl-over-slf4j or log4j-over-slf4j, were
used in conjunction with JUL as the underlying logging system,
JDK14LoggerAdapter created a LogRecord even for disabled log
statements. This performance issue was reported in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=90">bug 90</a> by
Matthew Mastracci.
</p>
<p>Added support for array values, including multi-dimensional
arrays, as parameters. For example,</p>
<p class="source">log.debug("{} {}", "A", new int[] {1, 2}});</p>
<p>will print as "A [1, 2]" instead of "A [I@6ca1c" as
previously. This enhancement was proposed by "lizongbo".
</p>
<p>Parameter substitution code has been simplified. SLF4J now only
cares about the "{}" formatting anchor, that is the '{' character
immediately followed by '}'. Previously, the '{' had meaning on its
own. As a result of this change, users no longer need to escape the
'{' unless it is immediately followed by '}'. Existing messages
which escaped standalone '{' character will be printed with a
preceding backslash. However, no data loss in the printed messages
will occur.
</p>
<p>Added missing <code>getInstance</code> methods to the
<code>Category</code> class in the log4j-over-slf4j module, fixing
<a href="http://bugzilla.slf4j.org/show_bug.cgi?id=95">bug 95</a>
reported by Michael Rumpf.</p>
<hr noshade="noshade" size="1"/>
<h3>June 8th, 2008 - Release of SLF4J 1.5.2</h3>
<p>Improvements to SLF4J documentation as well as fix of <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=88">packaging
problems</a> related to <em>jul-to-slf4j.jar</em> and
<em>jcl104-over-slf4j.jar</em>.
</p>
<h3>June 5th, 2008 - Release of SLF4J 1.5.1</h3>
<p>See also the <a href="compatibility.html#1_5_1">compatibility
report for this version</a>.</p>
<p>In order to support JCL version 1.1.1, the
<em>jcl<b>104</b>-over-slf4j</em> module was renamed as
<em>jcl-over-slf4j</em>. SLF4J will no longer ship with
<em>jcl104-over-slf4j.jar</em> but with <em>jcl-over-slf4j.jar</em>.
The related work responds to enhancement request discussed in <a
href="http://jira.qos.ch/browse/SLF4J-76">issue 76</a> as
reported by Niklas Gustavsson.
</p>
<p>The <em>slf4j-jcl</em> binding now depends on commons-logging
version 1.1.1 instead of the older 1.0.4</p>
<p>Added a java.util.logging to SLF4J bridge as requested in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=38">bug 38</a> by
Christian Stein, David Smiley, Johan Ferner, Joern Huxhorn and
others.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=68">bug
68</a> reported by Su Chuan and David Rauschenbach. SLF4J requires
log4j 1.2.12 or later. However, if an older version of log4j is
present (lacking the TRACE level), in order to avoid
NoSuchMethodError exceptions, the SLF4J's
<code>Log4jLoggerAdapter</code> will map the TRACE level as DEBUG.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=78">bug
78</a> reported by Venu Thachappilly. If the argument array passed
to a Logger printing method (debug, info, etc.) was null, a
<code>NullPointerException</code> was thrown. With the correction,
the messagePattern is returned as is, without parameter
substitution.
</p>
<p>Added the <code>getCopyOfContextMap</code> and
<code>setContextMap</code> methods to the <code>MDCAdapter</code>
and <code>org.sf4j.MDC</code> classes. This was requested in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=84">bug 84</a> by
Anton Tagunov.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=74">bug
74</a>, an endless recursion problem in Marker.contains method,
reported by Michael Newcomb. Also added he
<code>getDetachedMarker</code> method to <code>IMarkerFactor</code>
and <code>MarkerFactory</code> classes which was indirectly
requested in bug 74.
</p>
<p>Added the methods <code>getLevel()</code> and
<code>getEffectiveLevel()</code> to the <code>Category</code> class
in log4j-over-slf4j. This addition was requested in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=74">bug 74</a> by
Michael Newcomb.
</p>
<p>The <a href="migrator.html">SLF4J Migrator</a>
tool has been improved to support migration from JUL to SLF4J.
</p>
<p>In <code>MarkerIgnoringBase</code> class, corrected mapping of
trace methods with markers to their equivalents without marker
data. Previously, the mapping was trace to debug. The incorrect
mapping affected only calls to the trace method with
markers. Interestingly enough, this bug was picked up by new unit
tests and has not been reported as a bug by our users.
</p>
<h3>February 26th, 2008 - Release of SLF4J 1.5.0</h3>
<p>A tool called <a href="migrator.html">SLF4J Migrator</a> now
ships with SLF4J. It can help you migrate your project using JCL or
log4j to use SLF4J instead.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=61">bug
61</a> reported by Christopher Sahnwaldt. It is now possible to
place a backslash in front of a formatting anchor, by escaping the
backslash. For example, the call to
<code>MessageFormatter.format("C:\\\\{}", "foo")</code> will now
correctly return "C:\\foo". The backslash character needs to be
escaped in Java, which leads to four backslashes.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=63">bug
63</a> reported by Maarten Bosteels. SLF4J now supports MDC for
<code>java.util.logging</code> package.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=64">bug
64</a> reported by Michal Bernhard. The log4j binding will now alert
the user if she uses SLF4J with a version of log4j earlier than 1.2.12.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=65">bug
65</a> reported by Ben Gidley. Superfluous
<version>${parent.version}</version> lines have been
removed from pom.xml files. These lines reportedly confuse certain
Maven repositories.
</p>
<p>In the <code>org.apache.log4j.Category</code> class, as
implemented in the log4j-over-slf4j module, calls to the printing
trace() are now correctly mapped to SLF4J's trace() printing method
(instead of debug()). Superfluous printing methods with the
signature <code>xxxx(Object, Object)</code> and <code>xxxx(String,
Object, Object)</code> have been removed.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=67">bug
67</a> reported by Chris Custine. The manifest file for
jcl104-over-slf4j now correctly declares version 1.0.4 for the
exported JCL packages.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=69">bug
69</a> reported by Joern Huxhorn, who graciously supplied the fix as
well as a test case. The <code>add</code> method in
<code>BasicMarker</code> class now correctly prevents multiple
addition of the same child. Moreover, the <code>remove</code> method
now correctly removes the specified child marker.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=41">bug
41</a> reported by Sebastian Davids. The manifest files of various
projects now mention J2SE-1.3 as the required execution
environment.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=71">bug
71</a> reported by Manfred Geiler. The SLF4JLog and
SLF4JLocationAwareLog classes are now serializable solving
serialization problems encountered with certain libraries which
attempt to serialize JCL log instances.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=73">bug
73</a> reported by Oleg Smirsky. A "Fragment-Host: slf4j.api" line
has been added to every MANIFEST.MF file exporting
<code>org.slf4j.impl</code>.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=72">bug
72</a> reported by Ian Carr. Performance issues with slf4j-jdk14 for
disabled log statements have now been corrected.
</p>
<hr noshade="noshade" size="1"/>
<h3>August 20th, 2007 - Release of SLF4J 1.4.3</h3>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=60">bug
60</a> as reported by Costin Leau. OSGI manifest entries now declare
the correct SLF4J version.
</p>
<p>Clarified the behavior of the various methods methods in the MDC
class with respect to "null" parameters. This was requested in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=58">bug 58</a> by
Sebastian Davids.
</p>
<p>Removed the slf4j-archetype module because nobody seems to have a
use for it.</p>
<h3>July 12th, 2007 - Release of SLF4J 1.4.2</h3>
<p>The <a href="log4j-over-slf4j.html">log4j-over-slf4j</a> module
has been moved back into SLF4J. Originally, this module was part of
SLF4J and was moved into logback due to the lack of MDC support in
SLF4J. With version 1.4.2 and the addition of MDC support in SLF4J
1.4.1, log4j-over-slf4j returns to its original home. Note that the
previous name of the module was <a
href="http://logback.qos.ch/bridge.html">log4j-bridge</a>.
</p>
<p>Addition of the <code>getMDCAdapter</code> method to
org.slf4j.MDC class. This allows access to the actual MDC
implementation which can on occasion come in very handy.
</p>
<hr noshade="noshade" size="1"/>
<h3>July 4th, 2007 - Release of SLF4J 1.4.1</h3>
<p>SLF4J now supports <a href="manual.html#mdc">Mapped Diagnostic
Contexts</a> (MDC) as requested by Andy Gerweck and Steve Ebersole
in <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=49">bug
49</a>.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=53">bug
53</a> as reported by Heinrich Nirschl. The public method
<code>trace(String)</code> in the <code>Log4jLoggerAdapter</code>
class incorrectly called the underlying log4j logger with level DEBUG
instead of TRACE.
</p>
<p>Fixed various documentation related errors kindly reported by
Mark Vedder.
</p>
<hr noshade="noshade" size="1"/>
<h3>May 16th, 2007 - Release of SLF4J 1.4.0</h3>
<p>In response to many user requests over time, the TRACE level has
been added to <a
href="api/org/slf4j/Logger.html">org.slf4j.Logger</a>
interface. Please also see the <a href="faq.html#trace">FAQ entry
discussing</a> the TRACE level.
</p>
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=47">bug
47</a> as reported by Terry Todd. In previous a SLF4J release the
<code>org.apache.commons.logging.impl.SLF4FLogFactory</code> class
was renamed as <code>SLF4JLogFactory</code>. The
<em>META-INF/services/org.apache.commons.logging.LogFactory</em>
resource file had not reflected this change. It does now.
</p>
<p>Eric Yung <a
href="http://www.slf4j.org/pipermail/user/2007-April/000327.html">reported</a>
that Apache commons-configuration access certain commons-logging
classes, namely <code>org.apache.commons.logging.impl.NoOpLog</code>
and SimpleLog, directly. Following Eric's suggestion,
jcl104-over-slf4j now includes the aforementioned classes.
</p>
<hr noshade="noshade" size="1"/>
<h3>April 15th, 2007 - Release of SLF4J 1.3.1</h3>
<p>In response to a <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=39">enhancement
request</a> made by Michael Newcomb, a marker can now be detached
from the internal list of the <code>MarkerFactory</code> that
generated it.
</p>
<p>Fixed a silly but nonetheless annoying bug where log request of
level ERROR made through jcl104-over-slf4j would log twice. This bug
was <a
href="http://www.slf4j.org/pipermail/user/2007-April/000323.html">reported</a>
and precisely described by Andrew Cooke.
</p>
<hr noshade="noshade" size="1"/>
<h3>February 25th, 2007 - Release of SLF4J 1.3.0</h3>
<p>This release consists of rearrangement of classes among
projects. More specifically, the
<code>org.slf4j.LoggerFactory</code> class is now packaged within
the <em>slf4j-api.jar</em> file instead of the various slf4j
bindings. <b>It follows that client code needs to depend on only
slf4j-api in order to compile, while the various slf4j bindings are
only needed as runtime dependencies.</b> See also the <a
href="faq.html#maven2">Maven2-related FAQ entry</a>. Given the
practical significance of this change, we highly recommend that
library-authors upgrade to version 1.3 at their earliest
convenience.
</p>
<p><a href="http://bugzilla.slf4j.org/show_bug.cgi?id=23">Bug number
23</a> has been fixed, at the cost of minor and backward compatible
changes. In other words, jcl104-over-slf4j now preserves caller
location information.
</p>
<p>It is now possible to obtain the root logger of the underlying
logging implementation by requesting a logger named
"ROOT". This feature was requested by Sebastien Davids
in <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=35">bug
report 35</a>. </p>
<p>For an exact list of changes please refer to the <a
href="changes/changes-1.3.txt">1.3.0 compatibility report</a> file
as generated by clirr.</p>
<hr noshade="noshade" size="1"/>
<h3>January 24th, 2007 - Release of SLF4J 1.2</h3>
<p>This release includes several modifications to make SLF4J
an <a href="http://www.osgi.org/">OSGi</a>-friendly framework.
The modules' MANIFEST.MF files now include
OSGi metadata. Regarding these improvements, and OSGi in general, the
SLF4J project is happy to welcome John E. Conlon as a new committer.
</p>
<p>Marker objects are now Serializable.
</p>
<hr noshade="noshade" size="1"/>
<h3>December 21st, 2006 - Release of SLF4J 1.1.0 (final)</h3>
<p>This release consists of minor bug fixes and documentation
changes. More importantly, the log4j-over-slf4j module has been
moved to the logback project, under the name <a
href="http://logback.qos.ch/bridge.html">log4j-bridge</a>.
</p>
<p>Added the file "org.apache.commons.logging.LogFactory" under
META-INF/services directory which went missing in the 1.1.0 series
of SLF4J. This fixes a compatibility problem with Apache Axis which
uses its own discovery mechanism, namely, commons-discovery version
0.2. The problem was reported in bug <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=33">report 33</a>
by David Varnes.
</p>
<p>The file jcl104-over-slf4j.jar had various entries missing in its
MANIFEST.MF file, as reported by Boris Unkel in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=30">bug number
30</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>November 16th, 2006 - Release of SLF4J 1.1.0-RC1</h3>
<p>This release consists of packaging related bug fix in addition to
minor documentation changes.
</p>
<p>Contrary to RC0, RC1 no longer uses SNAPSHOT versions for the
slf4j-parent pom. The solution to <a
href="http://ceki.blogspot.com/2006/11/solution-to-maven2-version-number.html">Maven
version problem</a> does not work for public projects such as SLF4J
because SNAPSHOTs are not allowed on ibiblio.
</p>
<hr noshade="noshade" size="1"/>
<h3>November 4th, 2006 - Release of SLF4J 1.1.0-RC0</h3>
<p>This release consists of bug fixes. Moreover, since the major
packaging related changes in 1.1.0-beta0 seem to work well, this
release is marked as RC0.</p>
<p>Fixed the JDK 1.5 dependency for the SLF4J build, as reported by
Boris Unkel in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=28">bug number
28</a>. SLF4J now explicitly declares a dependency on JDK 1.4 in its
pom.xml file.
</p>
<p>Fixed an incorrect reference to the logback project in slf4j-api
pom file. This bug was reported by Boris Unkel in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=29">bug number
29</a>.
</p>
<p>Fixed a synchronization problem in factories of almost all SLF4J
bindings. This bug was reported independently by Howard M. Lewis Ship
and Boris Unkel in bug reports <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=26">26</a> and
respectively <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=26">27</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>September 7th, 2006 - Release of SLF4J 1.1.0-beta0</h3>
<p>Release 1.1.0-beta0 is a relatively important release with a
refactoring of the way class files are organized in jar files. In
previous releases, each binding was self-contained in a single jar
file. In this release, each and every binding depends on
<em>slf4j-api.jar</em> which contains the bulk of the classes
required to use SLF4J, except for one or two adapter classes. Only
the adapter classes are now shipped with each specific binding jar
as appropriate for the underlying logging system..
</p>
<p>This release is built using Maven instead of Ant. As for the java
code, it has not been changed.</p>
<hr noshade="noshade" size="1"/>
<h3>June 8th, 2006 - Release of SLF4J 1.0.2</h3>
<p>Release 1.0.2 is a maintenance release containing bug fixes
only.</p>
<ul>
<li>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=22">bug number
22</a> reported by Bjorn Danielsson. This version of the SLF4J API
will no longer systematically throw an exception when the
<code>o.a.c.l.impl.SLF4FLogFactory#release()</code> method is
invoked. Instead, the <code>release()</code> method will issue a
<a href="http://www.slf4j.org/codes.html">warning</a>.
</li>
</ul>
<hr noshade="noshade" size="1"/>
<h3>May 1st, 2006 - Release of SLF4J 1.0.1</h3>
<p>Release 1.0.1 is a maintenance release containing bug fixes
only.</p>
<ul>
<li>Fixed <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=20">bug number
20</a> reported by Steve Bate. <code>JDK14LoggerAdapter</code>
will now correctly relay the logger name to the underlying JDK 14
logging system.
</li>
<li>Added the file "org.apache.commons.logging.LogFactory" under
META-INF/services directory in the jcl104-over-slf4j jar
file. This fixes a compatibility problem with Apache Axis which
uses its own discovery mechanism, namely, commons-discovery
version 0.2. The bug was reported by Dave Wallace.
</li>
</ul>
<hr noshade="noshade" size="1"/>
<h3>March 8th, 2006 - Release of SLF4J 1.0</h3>
<p>This is release labeled as 1.0 (final) contains few relatively
minor changes:
</p>
<ul>
<li>As <a
href="http://marc.theaimsgroup.com/?t=114063163800004">discussed</a>
on the slf4j user list, <code>SimpleLogger</code> now directs its
output to stderr instead of stdout.
</li>
<li>Modified <code>JDK14LoggerAdapter</code> so that caller
information is now correctly printed, as reported in <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=13">bug 13</a> by
Peter Royal.
</li>
<li>Minor additions to the Marker interface.</li>
</ul>
<hr noshade="noshade" size="1"/>
<h3>February 4th, 2006 - Release of SLF4J 1.0-RC6 and NLOG4J
1.2.22</h3>
<p>The <code>MarkingLogger</code> interface has been removed and its
contents merged into <code>org.slf4j.Logger</code>. This change
should not adversely affect end-users. However, SLF4J bindings need
to be updated. This has been done for all the bindings shipped with
SLF4J distribution as well as NLOG4J. As for x4juli, the update is
planned for its next release.
</p>
<p>The merge between the <code>MarkingLogger</code> and
<code>Logger</code> interfaces has been motivated by the need to
allow end-users to easily switch between logging systems that
support markers and those that do not.
</p>
<p>Added a default instance to SimpleLoggerFactory to serve as a
last resort fallback mechanism. This instance is designed to be used
by a very specific group of users, namely for those developing
logging systems (e.g. log4j or LOGBack). It is not intended for
end-users of the SLF4J API.
</p>
<hr noshade="noshade" size="1"/>
<h3>January 9th, 2006 - Release of SLF4J 1.0-RC5 and NLOG4J
1.2.21</h3>
<p>A maintenance release correcting bugs <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=11">#11</a> and <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=12">#12</a> and in
general improved resilience to null input parameters across
implementations. Many thanks to Boris Unckel and Kenneth for
reporting the null input issue.
</p>
<hr noshade="noshade" size="1"/>
<h3>December 27th, 2005 - Release of SLF4J 1.0-RC4 and NLOG4J
1.2.20</h3>
<p>The printing methods in <code>org.slf4j.Logger</code> interface
now support passing 3 or more parameters in an <code>Object</code>
array. This was a frequently requested feature missing in previous
versions of SLF4J.
</p>
<p>NLOG4J 1.2.20 reflects the addition of new methods in the
<code>org.slf4j.Logger</code> interface.</p>
<hr noshade="noshade" size="1"/>
<h3>December 8th, 2005 - Release of SLF4J 1.0-RC3</h3>
<p>Maintenance release fixing reported bugs <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=6">#6</a> and <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=7">#7</a>.
</p>
<h3>November 28th, 2005 - Release of SLF4J 1.0-RC2</h3>
<p>In response to a request by Greg Wilkins, this release adds the
jar file <em>slf4j-jcl.jar</em>, an SLF4J binding for JCL. Please
read the <a href="manual.html#gradual">gradual migration section</a>
in the manual for more details.
</p>
<hr noshade="noshade" size="1"/>
<h3>November 21st, 2005 - Release of SLF4J 1.0-RC1</h3>
<p>A maintenance release correcting bugs <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=4">#4</a> and <a
href="http://bugzilla.slf4j.org/show_bug.cgi?id=5">#5</a>. Many
thanks to Christian Beil for accurately reporting bug #4.
</p>
<p>There has been also an effort to minimize the file sizes of the
various jar files produced by SLF4J, resulting in jar files
approximately 40% smaller than in version 1.0beta9.
</p>
<p>Given that the SLF4J API is now deemed stable, this release is
marked as RC1, that is release candidate number 1.
</p>
<hr noshade="noshade" size="1"/>
<h3>October 19th, 2005 - Release of SLF4J 1.0-beta9</h3>
<p>The SLF4J distribution now includes two distinct bindings
<em>slf4j-log4j12.jar</em> and <em>slf4j-log4j13.jar</em> in order
to differentiate between log4j version 1.2 and version 1.3. This
distinction is absolutely necessary because log4j 1.2 and 1.3 are
not run-time compatible, although they are mostly compile-time
compatible.
</p>
<hr noshade="noshade" size="1"/>
<h3>October 19th, 2005 - Release of SLF4J 1.0-beta8 and NLOG4J 1.2.18</h3>
<p>Added a new SLF4J binding, <em>slf4j-log4j.jar</em>, intended to
be used in conjunction with vanilla <em>log4j.jar</em>, as
distributed by the <a href="http://logging.apache.org">Apache
Logging Services</a> project. The slf4j-log4j binding is quite
similar in structure to the JDK 1.4 binding that existed
previously.
</p>
<p>The slf4j-log4j binding addresses compatibility problems which
arose when copies of both <em>log4j.jar</em> and <em>nlog4j.jar</em>
lay on the class path, in particular when it was undesirable or
impossible to remove the preexisting <em>log4j.jar</em> file.
</p>
<p>Methods in the <code>org.slf4j.Logger</code> interface related to
markers were moved to a separate super interface called <a
href="api/org/slf4j/MarkingLogger.html">
<code>org.slf4j.MarkingLogger</code></a>. This refactoring reduces
the weight of the <a href="api/org/slf4j/Logger.html">
<code>Logger</code></a> interface.
</p>
<hr noshade="noshade" size="1"/>
<h3>August 28th, 2005 - Release of SLF4J 1.0-beta7 and NLOG4J 1.2.17</h3>
<p>Spurred by <a
href="http://jira.qos.ch/browse/SLF4J-1">SLF4J-1</a>, SLF4J binding
code has been refactored and simplified. Logging systems
implementing SLF4J interfaces have to have less work in order to
bind with SLF4J. Moreover, these changes have no incidence on the
published interface of SLF4J.
</p>
<hr noshade="noshade" size="1"/>
<h3>August 26th, 2005 - Release of SLF4J 1.0-beta6</h3>
<p>To ease migration to SLF4J from JCL, this release includes a jar
file called <em>jcl-over-slf4j-1.0.4.jar</em>. This jar file can be
used as drop-in replacement for JCL version 1.0.4. It implements the
public API of JCL using SLF4J underneath.
</p>
<p>Thus, you can immediately benefit from the advantages of SLF4J
without waiting for all the libraries you depend on to migrate to
SLF4J first.</p>
<hr noshade="noshade" size="1"/>
<h3>August 16th, 2005 - Release of NLOG4J 1.2.16</h3>
<p>This release adds solves a compatibility problem between log4j
and nlog4j. Previous to this release, code compiled with log4j
would not run correctly with nlog4j.
</p>
<p>With the fixes introduced in NLOG4J 1.2.16, code compiled with
log4j 1.2.x will run without problems when deployed using NLOG4j.
</p>
<p>However, the inverse is not true. Code compiled with nlog4j can
only be deployed using nlog4j.
</p>
<hr noshade="noshade" size="1"/>
<h3>August 12th, 2005 - Release of SLF4J 1.0-beta5 and NLOG4J
1.2.15</h3>
<p>This release adds support for the <a
href="api/org/slf4j/Marker.html">Marker</a> interface. Thus, log
statements can be decorated with Marker data allowing more
expressive power in the processing of log statements.
</p>
<p>For the sake of IoC frameworks, <code>Logger</code> instances can
new be queried for their <a
href="api/org/slf4j/Logger.html#getName()">name</a>.
</p>
<p>With the addition of markers, sub-domains are no longer
needed.</p>
<p>The <code>LoggerFactoryAdapter</code> has been simplified and
renamed as <a
href="api/org/slf4j/ILoggerFactory.html"><code>ILoggerFactory</code></a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>July 5th, 2005 - Release of NLOG4J 1.2.14</h3>
<p>This release fixes compatibility problems between NLOG4J and
Jakarta Commons Logging.
</p>
<hr noshade="noshade" size="1"/>
<h3>June 28th, 2005 - Release of SLF4J 1.0-beta4 and NLOG4J
1.2.13</h3>
<p>Following discussions on the SLF4J developers list, the
signatures of the printing methods in <a
href="api/org/slf4j/Logger.html"><code>org.slf4j.Logger</code></a>
interface have been modified to admit messages of type
<code>String</code> instead of type <code>Object</code> as
previously. The current set of printing methods is listed below.
</p>
<pre class="source">
void debug(String msg);
void debug(String format, Object arg);
void debug(String format, Object arg1, Object arg2);
void debug(String msg, Throwable t);
void error(String msg);
void error(String format, Object arg;)
void error(String format, Object arg1, Object arg2);
void error(String msg, Throwable t);
void info(String msg);
void info(String format, Object arg);
void info(String format, Object arg1, Object arg2);
void info(String msg, Throwable t);
void warn(String msg);
void warn(String format, Object arg);
void warn(String format, Object arg1, Object arg2);
void warn(String msg, Throwable t); </pre>
<p>NLOG4J release 1.2.13 reflects changes in the SLF4J API.
</p>
<p>You can download SLF4J and NLOG4J, including full source code,
class files and documentation on our <a
href="download.html">download page</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>May 17th, 2005 - SLF4J version 1.0-beta-3 released</h3>
<p>In response to user comments, the <code>org.slf4j.ULogger</code>
interface has been renamed as <code>org.slf4j.Logger</code>.
</p>
<hr noshade="noshade" size="1"/>
<h3>May 17th, 2005 - NLOG4J version 1.2.12 released</h3>
<p>SLF4J.ORG is proud to release NLOG4J 1.2.12, a log4j-replacement
with native SLF4J API support. Except for users of LF5, chainsaw or
<code>NTEvenAppender</code>, NLOG4J should be considered as a 100%
compatible, drop-in replacement for log4j version 1.2.9.
</p>
<p>This release reflects changes in the SLF4J API, i.e renaming of
<code>org.slf4j.ULogger</code> interface as
<code>org.slf4j.Logger</code>.
</p>
<hr noshade="noshade" size="1"/>
<h3>May 17th, 2005 - SLF4J version 1.0-beta-3 released</h3>
<p>SLF4J.ORG is proud to release SLF4J 1.0-beta-3. In response to
user comments, the <code>org.slf4j.ULogger</code> interface has been
renamed as <code>org.slf4j.Logger</code>.
</p>
<p>You can download SLF4J, including full source code, class files
and documentation on our <a href="download.html">download page</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>May 14th, 2005 - NLOG4J version 1.2.11 released</h3>
<p>SLF4J.ORG is proud to release NLOG4J 1.2.11, a log4j-replacement
with native SLF4J API support. Except for users of LF5, chainsaw or
<code>NTEvenAppender</code>, NLOG4J should be considered as a 100%
compatible, drop-in replacement for log4j version 1.2.9.
</p>
<p>You can download NLOG4J version 1.2.11, including full source
code, class files and documentation on our <a
href="download.html">download page</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>May 4th, 2005 - SLF4J version 1.0-beta-2 released</h3>
<p>SLF4J.ORG is proud to release SLF4J 1.0-beta-2. This release
contains cosmetic or javadoc changes. For example, the project has a
new logo.
</p>
<p>You can download SLF4J version 1.0-beta2, including full source
code, class files and documentation on our <a
href="download.html">download page</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>1 May 2005 - not-log4j-1.2.10 released</h3>
<p>Subsequent to the recall of log4j 1.2.10, SLF4J.ORG releases
non-log4j-1.2.10 for those interested in SLF4J support in log4j.
</p>
<p>You can download not-log4j version 1.2.10, including full source
code, class files and documentation on our <a
href="download.html">download page</a>.
</p>
<hr noshade="noshade" size="1"/>
<h3>22 April 2005 - SLF4J project goes live</h3>
<p>The SLF4J project site, including SVN repositories go
live. Users can download SLF4J version 1.0-beta1.
</p>
<hr noshade="noshade" size="1"/>
<h3>15 April 2005 - start of work on SLF4J source code</h3>
<p>Start of work on the SLF4j source code.
</p>
<hr noshade="noshade" size="1"/>
<h3>13 April 2005 - start of work on SLF4J project</h3>
<p>Launch of the SLF4J project. Work has begun on the web-site, svn
repositories as well as the source code.
</p>
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