Hello,
i m developping a web application with struts framework
i got this error,which indicates that there a null pointer exception
but nothing else
any one know how can i find the null variable ...

here is the exception

java.lang.NullPointerException
    at
org.apache.jsp.pages.CPFA_005fMensuel.saisi_005fajustement.ajust_005fcpe1_jsp._jspService(ajust_005fcpe1_jsp.java:498)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
    at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679)
    at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461)
    at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:399)
    at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
    at
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)
    at
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
    at
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)
    at
org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
    at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
    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:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
    at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
    at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
    at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
    at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Unknown Source)

Thanks
Regards
Elyes.

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