NoSuchObjectException exception in RMI

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

 

 

發表評論
所有評論
還沒有人評論,想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.
相關文章