MessageBroker初始化期间抛出错误

| 在用Hibernate测试Flex,Spring,jBPM5,Drools和JPA的项目时。在初始化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
    
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