Cannot identify reason of error 500

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I'm new to websphere and JSP and JAVA. I am not sure where and what problem i'm facing. I've basically configured all that i can think of, including the document root, classpaths and etc. but this error keep coming up...

I was suppose to redeploy a web application on a new server but i can't seem to make it run properly.

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Root Error-1: null java.lang.NullPointerException at com.hsbc.pbcs.user.accessor.UserDataBeanAccessor.validateLogin(UserDataBeanAccessor.java:666) at com.hsbc.pbcs.user.bean.UserDataBean.validateLogin(UserDataBean.java:490) at com.hsbc.pbcs.user.servlet.LoginManagerServlet.validateLogin(LoginManagerServlet.java:120) at com.hsbc.pbcs.user.servlet.LoginManagerServlet.doPost(LoginManagerServlet.java:63) at javax.servlet.http.HttpServlet.service(HttpServlet.java:566) at javax.servlet.http.HttpServlet.service(HttpServlet.java:639) at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:580) at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:160) at com.ibm.servlet.engine.webapp.IdleServletState.service(StrictLifecycleServlet.java:287) at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:105) at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:353) at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:729) at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:655) at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebApp.java:1269) at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebApp.java:1106) at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebApp.java:1039) at com.hsbc.pbcs.navigation.ControllerServlet.doPost(ControllerServlet.java:96) at javax.servlet.http.HttpServlet.service(HttpServlet.java:566) at javax.servlet.http.HttpServlet.service(HttpServlet.java:639) at com.ibm.servlet.engine.webapp.StrictServletInstance.doService(ServletManager.java:580) at com.ibm.servlet.engine.webapp.StrictLifecycleServlet._service(StrictLifecycleServlet.java:160) at com.ibm.servlet.engine.webapp.IdleServletState.service(StrictLifecycleServlet.java:287) at com.ibm.servlet.engine.webapp.StrictLifecycleServlet.service(StrictLifecycleServlet.java:105) at com.ibm.servlet.engine.webapp.ServletInstance.service(ServletManager.java:353) at com.ibm.servlet.engine.webapp.ValidServletReferenceState.dispatch(ServletManager.java:729) at com.ibm.servlet.engine.webapp.ServletInstanceReference.dispatch(ServletManager.java:655) at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebApp.java:1269) at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.dispatch(WebApp.java:1106) at com.ibm.servlet.engine.webapp.WebAppRequestDispatcher.forward(WebApp.java:1039) at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebGroup.java:646) at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:67) at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:155) at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:300) at com.ibm.servlet.engine.oselistener.SQEventListenerImp$ServiceRunnable.run(SQEventListenerImp.java:230) at com.ibm.servlet.engine.oselistener.SQEventListenerImp.notifySQEvent(SQEventListenerImp.java:104) at com.ibm.servlet.engine.oselistener.serverqueue.SQEventSource.notifyEvent(SQEventSource.java:202) at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.notifyService(SQWrapperEventSource.java:347) at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.run(SQWrapperEventSource.java:216) at com.ibm.servlet.engine.oselistener.outofproc.OutOfProcThread$CtlRunnable.run(OutOfProcThread.java:248) at java.lang.Thread.run(Thread.java:481)
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