RMI-server communicates oracle: Exception

Hallo everybody,
My task is:
- to implement in oracle Java stored procedure,
- to implement RMI server
- to load in oracle wrapper for Connection-object (ConnectionImpl), that has a reference at Connection (default oracle Connection), this ConnectionImpl-object will be passed to RMI-server, the RMI-server will call a method on this object.
- Stub and Skeleton of ConnectionImpl are on both sides available (inside of oracle (as .jar) and on RMI-server side).
First I start RMI-server. Then I call the stored procedure. It finds RMI-server, calls the method on RMI-server side, then RMI-server tries to call the method of ConnectionImpl with the following result:
Fehler: java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
     java.net.SocketException: Connection reset
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
     java.net.SocketException: Connection reset
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
     java.net.SocketException: Connection reset
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
     at sun.rmi.transport.Transport$1.run(Transport.java:148)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:534)
     at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
     at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
     at server.NativeDllServer_Stub.init(Unknown Source)
     at storedprocedure.OracleTest.verbinde(OracleTest:26)
Caused by: java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
     java.net.SocketException: Connection reset
     at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:274)
     at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:101)
     at elena.ConnectionImpl_Stub.returnString(Unknown Source)
     at server.NativeDllServer.init(NativeDllServer.java:18)
I will be thankful for every tip, how I can resolve it.

Its clear you have the java permission set to allow db Java to write to a socket, since the call to the RMI server works, but maybe you are missing the permission to allow db java to listen and/or read from a socket?
See:
http://download-west.oracle.com/docs/cd/B14117_01/java.101/b12021/security.htm#sthref714
for java.net.SocketPermission
Chris

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In reply to reply #4:
You can also quote the other part of my reply when it comes to snippets. There are so many pieces of code missing from your snippet that I simply cannot guess what is wrong. (Please do not put your entire class structures here.)
We get connections in many different classes at many different times. It is after all an application that does user work and the user work involves database accesses. Some of those accesses are before RMI (to establish repositories, etc). Most are after.
This URL (jdbc:oracle:thin:@wonder.cisco.com:1521:ODSDEV) appears to use a network connection (yes?). Is the 1521 a port? Are you trying to reuse this port? (the first conn uses the same URL). What port does RMI use?
There is nothing in your snippet that stands out obviously as "this is wrong".
RMI uses networking. JDBC uses networking.
Try substituting some other networking code in place of the RMI code and see if you still get a null trying the second connection. As you say, if you leave out the RMI code the second get.conn works.
Try leaving out the first get.conn. Do the RMI and second get.conn.
Try this and try that and try some more. I once had this problem with a network printer that would not print. The code was fine. The URL was fine. The response from the network and printer were both fine. The damn thing just wasn't printing. Turns out there was this bit, yes a single bit, in one word of a property called the "start print bit". If this bit wasn't on, nothing happened. I tried every combination until I finally found it.
I wish you the best.

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In reply to reply #4:
You can also quote the other part of my reply when it comes to snippets. There are so many pieces of code missing from your snippet that I simply cannot guess what is wrong. (Please do not put your entire class structures here.)
We get connections in many different classes at many different times. It is after all an application that does user work and the user work involves database accesses. Some of those accesses are before RMI (to establish repositories, etc). Most are after.
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I wish you the best.

Java.rmi.server.SkeletonMismatchException: interface hash mismatch

I am trying to get a MBORemoteSet from the session, which actually gives me the list from the database table. when i click on a combo box returning me the list using the MBOSetRemote object it throws me the exception.
could not load the labor codes from Maximo
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.server.SkeletonMismatchException: interface hash mismatch
java.rmi.server.SkeletonMismatchException: interface hash mismatch
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:240)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:215)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:349)
at worktech.app.labor.WTLaborSet_Stub.setWhere(Unknown Source)

Well this error occurs if the RMI files are different on the server and client side.
It basically tells you that the stub and skeleton don't match with each other. Get the latest version of the RMI jar file or whatever file you are using on the server side to replace the file you are using oon the client side. This would make stub and skeletons to communicate with each other effectively . enjoy :)

RMI-server communicates oracle: Exception

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