NoSuchObjectException exception in RMI

最新推荐文章于 2025-08-12 10:31:58 发布

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#exception #reference #network #object #server

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本文探讨了使用RMI调用时遇到java.rmi.NoSuchObjectException异常的问题，该问题可能由网络故障导致。文章提供了详细的解决方案，包括通过创建RMIHelper和服务保持器类来避免远程对象被垃圾回收。

If you are using RMI calling, this exception java.rmi.NoSuchObjectException maybe come up after network failed.

Perhaps the root causation is an issue(or bug) of RMI: the binded implement object has been GCed by DGC protocol.

we can reference this URL for detail:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4114579

To reproduce this failure, we can break down the network connection on a Server for a while, then restore network and execute :

interface = Naming.lookup();

interface.methodName(); // NoSuchObjectException will throw out

To resolve this problem, you can add two classes RMIHelper, ServiceObjectKeeper to encapsulate RMI calling, and replace all old calling

Naming.rebind() with RMIHelper.rebind(), Naming.bind() with RMIHelper.bind().

Thus will hold a strong reference to the remote object in the local VM.

The following content is picked up from J2SDK, it point out Java have a hidden trouble on this topic.

Note that if a network partition exists between a client and a remote server object, it is possible that premature collection of the remote object will occur (since the transport might believe that the client crashed). Because of the possibility of premature collection, remote references cannot guarantee referential integrity; in other words, it is always possible that a remote reference may in fact not refer to an existing object. An attempt to use such a reference will generate a RemoteException which must be handled by the application.

--- From J2SDK 1.4.1

Java Remote Method Invocation – 3.3 Garbage Collection of Remote Objects