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<h1>22. Virtuoso Functions Guide - java_get_property</h1>
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<h2>java_get_property</h2>
<div class="refpurpose">Gets a property value from a Java class instance.</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">java_get_property</span>
</span>
(<span class="paramdef">in <span class="parameter">class_name</span> varchar</span>,
<span class="paramdef">in <span class="parameter">instance_obj</span> varchar</span>,
<span class="paramdef">in <span class="parameter">field_name</span> varchar</span>,
<span class="paramdef">in <span class="parameter">field_ret_type_sig</span> varchar</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>Gets a property value from a Java class instance referenced by
instance_obj. If instance_obj is not supplied, ie NULL, then it
is returned as a static Java class property value.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">class_name – </span>
the name of the java class to get the property from
</div>
<div class="refsect2">
<span class="refsect2title">instance_obj – </span>
the Java VM class instance reference value (for example returned by java_new_object VSEI). Can be NULL.
</div>
<div class="refsect2">
<span class="refsect2title">field_name – </span>
the name of the field in the java class
</div>
<div class="refsect2">
<span class="refsect2title">field_ret_type_sig – </span>
the JNI type signature of the field.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_java_get_property1" />
<div class="example">
<div class="exampletitle">static value - Java's PI value returned as DOUBLE PRECISION</div>
<div>
<pre class="screen">
java_get_property ('java.lang.Math', NULL, 'PI', 'D');
</pre>
</div>
</div>
<a name="ex_java_get_property2" />
<div class="example">
<div class="exampletitle">default time zone name in tz_name</div>
<div>
<pre class="screen">
tz := java_call_method ('java.util.TimeZone', NULL, 'getDefault', 'Ljava/util/TimeZone;');
tz_name := java_get_property ('java.util.TimeZone', tz, 'getDisplayName', 'Ljava/lang/String;');
</pre>
</div>
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<div class="refsect1">
<div class="refsect1title">See Also</div>
<p>
<a href="fn_java_call_method.html">java_call_method()</a>
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<a href="fn_java_set_property.html">java_set_property()</a>
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<a href="fn_java_vm_attach.html">java_vm_attach()</a>
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