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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

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