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我正在开发一个使用以下JAVA RMI设置的分布式系统。Java RMI ClassCast异常
public interface NodeOperations {
/* RMI methods */
public FingerTable getFingerTable() throws RMIException;
}
public class Node implements NodeOperations {
/* Implements all RMI methods */
/* Also holds a object of FingerTable */
FingerTable ft;
}
public class FingerTable {
/* Holds a reference to Node class which has object of 'this' FingerTable */
Node self;
}
所有RMI通信都是通过NodeOperations
接口中存在的方法完成的。有一种方法会返回特定节点的对象FingerTable
。但是,当我从客户端调用该方法时,我会遇到异常。我该如何解决这个问题?
java.lang.ClassCastException: cannot assign instance of com.sun.proxy.$Proxy5 to field chord.FingerTable.self of type chord.Node in instance of chord.FingerTable
at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2133)
at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2237)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2231)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2155)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2013)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:326)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:175)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:227)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:179)
at com.sun.proxy.$Proxy5.getNodeInfo(Unknown Source)
at chord.NodeTest.testTopology(NodeTest.java:108)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
即使我这么认为,但我已经使所有这些类可序列化。 – Nullpointer
此代码不会产生此异常。至少缺少两件事。发布真实的代码。 – EJP