我正在使用Flex，Spring，jBPM5，Drools和带有Hibernate的JPA测试项目。在我初始化FrameworkServlet'Flex'的过程中，我遇到了AMF序列化和反序列化的问题。谁能帮帮我？
我的错误是：
[2011-06-14 16:01:52]|ERROR|org.springframework.flex.core.MessageBrokerFactoryBean|Error thrown during MessageBroker initialization
java.lang.IllegalArgumentException: Failed to create SpringPropertyProxy for org.drools.persistence.processinstance.ProcessInstanceInfo - Classes mapped for deserialization from AMF must have either a no-arg default constructor, or a constructor annotated with org.springframework.flex.core.io.AmfCreator