[Jackson](../../../jackson) datatype module (jar) to support JSON serialization and deserialization of [Guava](http://code.google.com/p/guava-libraries/) data types. ## Status [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.fasterxml.jackson.datatype/jackson-datatype-guava/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.fasterxml.jackson.datatype/jackson-datatype-guava/) [![Javadoc](https://javadoc-emblem.rhcloud.com/doc/com.fasterxml.jackson.datatype/jackson-datatype-guava/badge.svg)](http://www.javadoc.io/doc/com.fasterxml.jackson.datatype/jackson-datatype-guava) Module has been production-ready since version 2.3. Not all datatypes of Guava are support due to sheer size of the library; new support is added based on contributions. ## License [Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0.txt) ## Usage ### Maven dependency To use module on Maven-based projects, use following dependency: ```xml <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-guava</artifactId> <version>2.7.3</version> </dependency> ``` (or whatever version is most up-to-date at the moment) ### Registering module Like all standard Jackson modules (libraries that implement Module interface), registration is done as follows: ```java ObjectMapper mapper = new ObjectMapper() .registerModule(new GuavaModule()); ``` after which functionality is available for all normal Jackson operations. ### Configuration Configurable settings of the module are: * `configureAbsentsAsNulls` (default: true) (added in 2.6) * If enabled, will consider `Optional.absent()` to be "null-equivalent", and NOT serialized if inclusion is defined as `Include.NON_NULL` * If disabled, `Optional.absent()` behaves as standard referential type, and is included with `Include.NON_NULL` * In either case, `Optional.absent()` values are always excluded with Inclusion values of: * NON_EMPTY * NON_ABSENT (new in Jackson 2.6) ## More See [Wiki](../../wiki) for more information (javadocs, downloads).