Weblogic 8.1 - Error 500 Internal Server Error

Question

Please advise,
Often we encounter this problem in our Weblogic application server. It is configured as node manager running 4 ports.
The only solution is to restart port with error. 1 or more ports start giving error on Web Page as mentioned below:
Error 500--Internal Server Error
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.5.1 500 Internal Server Error
The server encountered an unexpected condition which prevented it from fulfilling the request.
Server trace log shows the following:
####<Nov 24, 2010 10:57:21 PM GMT+04:00> <Error> <HTTP> <dxbap01> <MAXSERVER02> <ExecuteThread: '23' for queue: 'weblogic.kernel.Default'> <<WLS Kernel>> <> <BEA-101017> <[ServletContext(id=29550756,name=maximo,context-path=/maximo)] Root cause of ServletException.
psdi.util.MXSystemException: Error getting maxmessage value for group login and key username.
     at psdi.server.MXServer.getMessage(MXServer.java:2552)
     at psdi.server.MXServer.getMessages(MXServer.java:2582)
     at psdi.util.RMISession.getMessages(Unknown Source)
     at jsp_servlet._webclient._login.__login._jspService(__login.java:364)
     at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
     at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6718)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
     at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Server thread Dump shows the following:
25 Nov 2010 06:17:40:405 [ERROR] A major exception has occurred.
Closed Connection
psdi.util.MXSystemException: A major exception has occurred.
Closed Connection
at psdi.server.MaxSession.getServerInfo(Unknown Source)
at psdi.server.MaxSessionThread.run(Unknown Source)
Caused by: java.sql.SQLException: Closed Connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
at oracle.jdbc.driver.OracleConnection.privatePrepareStatement(OracleConnection.java:962)
at oracle.jdbc.driver.OracleConnection.prepareStatement(OracleConnection.java:869)
at psdi.server.ConRef.prepareStatement(Unknown Source)
... 2 more
[Full GC 113478K->113433K(250872K), 0.9796708 secs]
25 Nov 2010 06:18:40:408 [ERROR] Error getting server information in MAXSESSION
java.sql.SQLException: Closed Connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
at oracle.jdbc.driver.OracleConnection.privatePrepareStatement(OracleConnection.java:962)
at oracle.jdbc.driver.OracleConnection.prepareStatement(OracleConnection.java:869)
at psdi.server.ConRef.prepareStatement(Unknown Source)
at psdi.server.MaxSession.getServerInfo(Unknown Source)
at psdi.server.MaxSessionThread.run(Unknown Source)
25 Nov 2010 06:18:40:408 [ERROR] A major exception has occurred.
Closed Connection
psdi.util.MXSystemException: A major exception has occurred.
Closed Connection
at psdi.server.MaxSession.getServerInfo(Unknown Source)
at psdi.server.MaxSessionThread.run(Unknown Source)
Caused by: java.sql.SQLException: Closed Connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:269)
at oracle.jdbc.driver.OracleConnection.privatePrepareStatement(OracleConnection.java:962)
at oracle.jdbc.driver.OracleConnection.prepareStatement(OracleConnection.java:869)
at psdi.server.ConRef.prepareStatement(Unknown Source)
... 2 more
[Full GC 113493K->113434K(250872K), 1.0056559 secs]

Answer 1

Hi,
Thanks for the reply.
Yes you are correct, i compiled using jdk1.5.
but my servlet code will not compile in jdk1.4 version since i used advanced vaector classes in that.
Is there any settings like script file that need to be changed so that i can point to my jdk1.5 compiler rather than the default one pointed by weblogic.
Thanks in advance
Ram