This is a multi-module umbrella project for various Jackson Datatype modules to support 3rd party Collection libraries.

Currently included are:

• Eclipse Collections datatype (for Eclipse Collections): jackson-datatype-eclipse-collections (since 2.10)
• Guava datatype (for Guava library): jackson-datatype-guava
• HPPC datatype (for High-Performance Primitive Collections): jackson-datatype-hppc
• PCollections datatype (for Persistent Java Collections): jackson-datatype-pcollections

All modules are licensed under Apache License 2.0.

To use these format backends Maven-based projects, use following dependency:

<dependency>
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-[COLLECTION]</artifactId>
  <version>2.13.3</version>
</dependency>

where COLLECTION would be one of guava, hppc, pcollections, or eclipse-collections (replace version with the latest available).

You may also use jackson-bom for defining consistent sets of versions of various Jackson components.

NOTE! Parent pom itself only specifies defaults to individual modules but DOES NOT include them, so you CAN NOT just add dependency to jackson-datatypes-collections. Individual datatype modules need to be included explicitly (or via some other pom that depends on them).

Like all standard Jackson modules (libraries that implement Module interface), registration for Collections datatypes is done using one of 2 mechanisms:

ObjectMapper mapper;

// New; 2.10.x / 3.0:
mapper = JsonMapper.builder() // or mapper for other formats
    .addModule(new GuavaModule())
    .addModule(new HppcModule())
    .addModule(new PCollectionsModule())
    .build();

// Old (2.x), not available on 3.x:
mapper = new ObjectMapper() // or mapper for other formats
    .registerModule(new GuavaModule())
    .registerModule(new HppcModule())
    .registerModule(new PCollectionsModule())
    .registerModule(new EclipseCollectionsModule())
    ;

after which datatype read/write support is available for all normal Jackson operations, including support for nested types.

See READMEs of individual modules for datatype-specific configuration, options and so on:

• jackson-datatype-eclipse-collections
• jackson-datatype-guava
• jackson-datatype-hpcc
• jackson-datatype-pcollections

@Bean
public Jackson2ObjectMapperBuilderCustomizer customize()
{
    return builder -> builder.modules( new GuavaModule() );
}