Failed to build body from content. Serializable class not available to broker

javax.jms.JMSException: Failed to build body from content. Serializable class not available to broker. 
Reason: java.lang.ClassNotFoundException: org.sun.activemq.entity.User
    at org.apache.activemq.util.JMSExceptionSupport.create(JMSExceptionSupport.java:36)
    at org.apache.activemq.command.ActiveMQObjectMessage.getObject(ActiveMQObjectMessage.java:213)
    at org.sun.spring_activemq_consumer.listener.MessageListener.receiveObjMessage(MessageListener.java:56)

ActiveMQ发布订阅发送 着对象的文件路径必须与接受者一致 否则报错