addExternalizer(new RemoveAllValuesOperation.Externalizer());
addExternalizer(new RemoveAtIndexOperation.Externalizer());
addExternalizer(new RetainAllValuesOperation.Externalizer());
addExternalizer(new SetValueOperation.Externalizer());
addExternalizer(new Paths.Externalizer());
ClassExternalizerFactory externalizerFactory = new MappingClassExternalizerFactory(externalizersByClass);
configuration.setClassExternalizerFactory(externalizerFactory);
}