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shiva
Regarding Login application program
1 Answer(s)      4 years and 2 months ago
Posted in : Struts


Hi this is shiva. iam writing a small login form using struts1.3.10 version. once iam submit the login button it shows NULLPointer Exception. I write a SOP Statement in ActionClass. in that, the values are not getting from the formbean.my formbean class name is "myform" and ActionClass is "myAction". the following code is written in myAction class.

public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest req, HttpServletResponse res)throws IOException

{

    myform Logf=(myform)form;
     String un1=Logf.getUn();
     String pa1=Logf.getPw();
    System.out.println(" Error  USER NAME:"+un1);
    System.out.println(" Error PASSWORD:"+pa1);
        if(un1.equals("shiva")&& pa1.equals("shiva"))
        return mapping.findForward("success");
        else
        return mapping.findForward("fail");

}

} .

The following Error is shown by JBOSS Server.

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.NullPointerException org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

root cause

java.lang.NullPointerException org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:289) org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:357) org.apache.struts.chain.commands.CreateActionForm.execute(CreateActionForm.java:92) org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51) org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191) org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305) org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191) org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283) org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

note The full stack trace of the root cause is available in the JBoss Web/2.1.3.GA logs.

JBoss Web/2.1.3.GA

-----------------------

is there any problem Please send to my mail id(shivatwoshiva@gmail.com), Thanks&Regards, Shiva s


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View Answers

October 19, 2010 at 1:27 PM


Hi,

Due to some configuration issues you form is not initializing

myform Logf=(myform)form;

And while typecasting it is giving java.lang.NullPointerException exception.

Please download the login form example from:

http://roseindia.net/struts/struts-login-form.shtml

Thanks



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