private final Map<Integer, MarshallingConfiguration> configurations = new ConcurrentHashMap<>();
public SessionAttributeMarshallingContext(Module module) {
MarshallingConfiguration configuration = MarshallingConfigurationFactory.createMarshallingConfiguration(module.getModuleLoader());
configuration.setClassTable(new SimpleClassTable(Serializable.class, Externalizable.class));
this.configurations.put(CURRENT_VERSION, configuration);
}