Rmi and classloader: some server instances can not find the class on server
Hi:
I want to migrate my rmi applications from JDK 1.1 to JDK1.2.2. It exists in the following environments:
- there is one authentication server and many application servers, all have binded in the main method
- dynamic loading of the server stubs and interfaces is not used; they are local on the client.
- security manager is enabled only on the server site and the policy file is created.
- all server classes, stubs and interfaces are in the same directory on server site
- the registry and the server are started as follows:
unsetenv CLASSPATH
rmiregistry 1103 &
setenv CLASSPATH ~usr/serverDir:~oracle/jdbc/lib/classes12.zip
java -Djava.rmi.server.codebase=file://~usr/serverDir/
-Djava.rmi.server.hostname=myHost -Djava.security.manager myServer
After starting the client, the rmi client connects to the server and the authentication request comes back with a list of applications.
When the user chooses one of them, the rmi sends the request to thatapplication (e.g., OMSRmiServer_Stub). The application could not find the other class on the sever directory: (the authenication server can find the same class)
java.lang.NoClassDefFoundError: JOMPrepStatement
at java.lang.Class.getFields0(Native Method)
at java.lang.Class.getFields0(Compiled Code)
at java.lang.Class.getDeclaredFields(Compiled Code)
at java.io.ObjectStreamClass$1.run(Compiled Code)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessController.doPrivileged(Compiled Code)
at java.io.ObjectStreamClass.<init>(Compiled Code)
at java.io.ObjectStreamClass.lookupInternal(Compiled Code)
at java.io.ObjectStreamClass.lookup(Compiled Code)
at java.io.ObjectStreamClass.lookupInternal(Compiled Code)
at java.io.ObjectStreamClass.lookup(Compiled Code)
at java.io.ObjectStreamClass.lookupInternal(Compiled Code)
at java.io.ObjectStreamClass.lookup(Compiled Code)
at java.io.ObjectStreamClass.lookupInternal(Compiled Code)
at java.io.ObjectOutputStream.writeObject(Compiled Code)
at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:256)
at sun.rmi.server.UnicastRef.invoke(Compiled Code)
at OMSRmiServer_Stub.executeStringSetSelect(Unknown Source)
at OMSDeviceRmiClient.getStatusLOV(OMSDeviceRmiClient.java:196)
at OMSRmiClient.getStatusLOV(OMSRmiClient.java:76)
at OMSDevicePane.listenToTree(Compiled Code)
at OMSDeviceContextPane.initComponents(OMSDeviceContextPane.java:107)
at OMSFrame.jomInit(Compiled Code)
at JOMCountFrame.init(JOMCountFrame.java:190)
at JOMCountFrame.run(JOMCountFrame.java:253)
at java.lang.Thread.run(Thread.java:485)
Any help is appreciated.
- Mahan.
in jdk1.2.2 no need classes12.zip in class path.
just set CLASSPATH=.;
that is enough for solving ur problem
bye
raghu
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