Plz help in solving this servlet error...

Hi,
I've a webapplication in struts. As soon as i submit the login form i'm getting this error :-
WARN [RequestProcessor] Unhandled Exception thrown: class java.lang.NullPointerException
08:58:10,071 ERROR [[action]] Servlet.service() for servlet action threw exception
java.lang.NullPointerException
     at com.java.action.LoginAction.doLogin(LoginAction.java:44)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:274)
     at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
     at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
     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.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     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:856)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     at java.lang.Thread.run(Unknown Source)
AND,
the my code at line 44(at com.java.action.LoginAction.doLogin(LoginAction.java:44)) is :-
userVO.setStrUserId((String)frmLogin.get("userid"));
at this line, i'm just trying to set the userid entered frm the login page.m i missing some settings or any jar files. I'm using JBoss4.0.2(AS), MyEclipse6.0(IDE), and struts1.1

Thanks for the replies frnds. As ganesh pointed, the mistake was from my side and very very silly, in LoginAction.java inspite of creating an instance for UserVO, i made it null(UserVO userVO = null;). After changing, things started working fine. Thanx again for the reply :-)
Edited by: garv on Jun 29, 2008 11:26 PM

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