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Thread: Error returned

  1. #1
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    Default Error returned

    Hello,

    I am using MySQL Server 5.0 with Apache Tomcat 5.5 and Eclipse SDK 3.2 to run my program. My program uses Java coding language. However, while running the program I received this error,

    java.lang.NullPointerException 
    at com.mysql.jdbc.Connection.registerStatement(Connection.java:4789) 
    at com.mysql.jdbc.Statement.<init>(Statement.java:264) 
    at com.mysql.jdbc.Connection.createStatement(Connection.java:2964) 
    at com.mysql.jdbc.Connection.createStatement(Connection.java:2944) 
    at org.apache.tomcat.dbcp.dbcp.DelegatingConnection.createStatement(DelegatingConnection.java:161) 
    at org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.createStatement(PoolingDataSource.java:204) 
    at bgoc.com.dbConn.Conn.execSQL(Conn.java:196) 
    at bgoc.webaccs.MaintainMenu.checkProgQty(MaintainMenu.java:301) 
    at bgoc.webaccs.MaintainMenu.getUserAppl(MaintainMenu.java:271) 
    at bgoc.webaccs.MenuGroup.createUserMenu(MenuGroup.java:248) 
    at bgoc.webaccs.MenuGroup.getUserMenu(MenuGroup.java:225) 
    at bgoc.webaccs.MenuGroup.getUserProgramAppl(MenuGroup.java:68) 
    at bgoc.webaccs.UserInfo.chkPageAndTyp(UserInfo.java:94) 
    at bgoc.webaccs.UserInfo.chkPage(UserInfo.java:59) 
    at org.apache.jsp.authorization.materialRequest.qo_005fnewreq_jsp._jspService(qo_005fnewreq_jsp.java:111) 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) 
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) 
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) 
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) 
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) 
    at java.lang.Thread.run(Unknown Source)


    I have no idea what is causing it. Does anyone have any idea of what are the possible causes of this error like lack of memory, connections or some xml settings? Thanks in advance.


  2. #2
    Super Moderator copeg's Avatar
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    Default Re: Error returned

    Please post the source code which causes this error. It is guesswork to determine the cause of the exception based upon the stack trace alone.

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