Call to JDBCConnectionPoolRuntime MBean hangs

I have written a program to get hold of a number of MBeans and periodically
call their getXXX() methods.
All is working OK apart from I intermittently have my program hang on calls
to JDBCConnectionPoolRunTime. The call never returns and as such the
thread I am using to monitor that MBean hangs and needs to be killed.
Does anyone have any ideas why this may be happening or has anyone else
experienced this?
WLS6.1 sp2
Windows2000
Oracle thin driver
Regards
Ed

Some information I forgot:
The MBean for the pool then is completely unusable until WLS is bounced! I
presume that although I am killing my monitoring program, the call is still
held somewhere?
This is very frustrating as monitoring the JDBC pools was one of the reason
for writing the code.
Regards
Ed
"Ed Barrett" <[email protected]> wrote in message
news:ab90ir$q94$[email protected]..
I have written a program to get hold of a number of MBeans andperiodically
call their getXXX() methods.
All is working OK apart from I intermittently have my program hang oncalls
to JDBCConnectionPoolRunTime. The call never returns and as such the
thread I am using to monitor that MBean hangs and needs to be killed.
Does anyone have any ideas why this may be happening or has anyone else
experienced this?
WLS6.1 sp2
Windows2000
Oracle thin driver
Regards
Ed

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public class RmiTestServer
public static void main(String args[])
try
java.rmi.registry.Registry zRegistry = null;
try
zRegistry = java.rmi.registry.LocateRegistry.createRegistry ( 1099 );
catch ( Exception zEx )
zRegistry = java.rmi.registry.LocateRegistry.getRegistry ( 1099 );
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public interface RmiTest extends java.rmi.Remote
public void callHello() throws java.rmi.RemoteException;
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public class RmiTestImpl extends java.rmi.server.UnicastRemoteObject
implements RmiTest
public RmiTestImpl() throws java.rmi.RemoteException
super();
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System.out.println ("Hello World!!!");
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public class RmiTestClient
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FINE: main: reuse connection
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FINE: main: reuse connection
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FINE: main: reuse connection
Jun 9, 2011 10:59:20 PM sun.rmi.transport.tcp.TCPChannel free
FINE: main: reuse connection
Done Calling Server - 0sec
Calling Server...
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FINER: main: exception:
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
at sun.rmi.transport.tcp.TCPConnection.isDead(TCPConnection.java:174)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:173)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:110)
at RmiTestImpl_Stub.callHello(Unknown Source)
at RmiTestClient.main(RmiTestClient.java:23)
Jun 9, 2011 10:59:21 PM sun.rmi.transport.tcp.TCPConnection isDead
FINE: main: server ping failed
Jun 9, 2011 10:59:21 PM sun.rmi.transport.tcp.TCPChannel free
FINE: main: close connection
Jun 9, 2011 10:59:21 PM sun.rmi.transport.tcp.TCPConnection close
FINE: main: close connection
Jun 9, 2011 10:59:21 PM sun.rmi.transport.tcp.TCPChannel createConnection
FINE: main: create connection
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Jun 9, 2011 10:59:21 PM sun.rmi.transport.proxy.RMIMasterSocketFactory createSocket
FINE: main: host: <IP Address>, port: 65427
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Jun 9, 2011 10:59:24 PM sun.rmi.transport.tcp.TCPChannel$1 run
FINER: RMI Scheduler(0): wake up
Jun 9, 2011 10:59:39 PM sun.rmi.transport.tcp.TCPChannel$1 run
FINER: RMI Scheduler(0): wake up
Jun 9, 2011 10:59:39 PM sun.rmi.transport.tcp.TCPChannel freeCachedConnections
FINER: RMI Scheduler(0): connection timeout expired
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java.net.ConnectException: Connection timed out
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:110)
at RmiTestImpl_Stub.callHello(Unknown Source)
at RmiTestClient.main(RmiTestClient.java:23)
Caused by: java.net.ConnectException: Connection timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
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at java.net.Socket.connect(Socket.java:478)
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at java.net.Socket.<init>(Socket.java:189)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
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