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,

Code code:

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.