A newer version of IMDG is available.

View latest

Want to try Hazelcast Platform?

We’ve combined the in-memory storage of IMDG with the stream processing power of Jet to bring you the all new Hazelcast Platform.

Serialization Configuration Wrap-Up

This section summarizes the configuration of serialization options, explained in the above sections, into all-in-one examples. The following are example serialization configurations.

Declarative Configuration:

  • XML

  • YAML

            <data-serializable-factory factory-id="1">com.hazelcast.examples.DataSerializableFactory
            <portable-factory factory-id="1">com.hazelcast.examples.PortableFactory</portable-factory>
            <serializer type-class="com.hazelcast.examples.DummyType"
        <java-serialization-filter defaults-disabled="true">
    portable-version: 0
    use-native-byte-order: false
    byte-order: BIG_ENDIAN
      - factory-id: 1
        class-name: com.hazelcast.examples.DataSerializableFactory
      - factory-id: 1
        class-name: com.hazelcast.examples.PortableFactory
      class-name: com.hazelcast.examples.GlobalSerializerFactory
      - type-class: com.hazelcast.examples.DummyType
        class-name: com.hazelcast.examples.SerializerFactory
    check-class-def-errors: true
      defaults-disabled: true
          - com.acme.app.BeanComparator
          - java.lang.String
          - example.Foo
          - com.acme.app
          - com.acme.app.subpkg
          - com.hazelcast.
          - java

Programmatic Configuration:

Config config = new Config();
SerializationConfig srzConfig = config.getSerializationConfig();
srzConfig.setPortableVersion( "2" ).setUseNativeByteOrder( true );
srzConfig.setAllowUnsafe( true ).setEnableCompression( true );
srzConfig.setCheckClassDefErrors( true );

GlobalSerializerConfig globSrzConfig = srzConfig.getGlobalSerializerConfig();
globSrzConfig.setClassName( "abc.Class" );

SerializerConfig serializerConfig = srzConfig.getSerializerConfig();
serializerConfig.setTypeClass( "Employee" )
                .setClassName( "com.EmployeeSerializer" );

Serialization configuration has the following elements.

  • portable-version: Defines versioning of the portable serialization. Portable version differentiates two of the same classes that have changes, such as adding/removing field or changing a type of a field.

  • use-native-byte-order: Set to true to use native byte order for the underlying platform. Its default value is false.

  • byte-order: Defines the byte order that the serialization uses: BIG_ENDIAN or LITTLE_ENDIAN. Its default value is BIG_ENDIAN.

  • enable-compression: Enables compression if default Java serialization is used. Its default value is false.

  • enable-shared-object: Enables shared object if default Java serialization is used. Its default value is false.

  • allow-unsafe: Set to true to allow unsafe to be used. Its default value is false.

  • data-serializable-factory: Custom classes implementing com.hazelcast.nio.serialization.DataSerializableFactory to be registered. These can be used to speed up serialization/deserialization of objects.

  • portable-factory: The PortableFactory class to be registered.

  • global-serializer: The global serializer class to be registered if no other serializer is applicable. This element has the optional boolean attribute override-java-serialization. If set to true, the Java serialization step is assumed to be handled by the global serializer. Java Serializable and Externalizable is prior to global serializer by default (false).

  • serializer: The class name of the serializer implementation.

  • check-class-def-errors: When set to true, the serialization system checks for class definitions error at start and throws a Serialization Exception with an error definition.

  • java-serialization-filter: Provides deserialization protection based on whitelisting and blacklisting the class/package names.