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  1. #1
    gladiator is offline Member
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    Apr 2011
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    Default HTTP Status 500 - type Exception report

    Hello
    Can someone help me figure out what exactly the problem, I get this code when I tried to run the the project.

    HTTP Status 500 -

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

    type Exception report

    message

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

    exception

    java.lang.NullPointerException
    cachondo_service.doGet(cachondo_service.java:138)
    javax.servlet.http.HttpServlet.service(HttpServlet .java:617)
    javax.servlet.http.HttpServlet.service(HttpServlet .java:717)


    note The full stack trace of the root cause is available in the Apache Tomcat/6.0.26 logs.

    Below is the code

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    PrintWriter out ;
    String user_id, passwd, action, qry, htmlPage;
    action= request.getParameter("action");

    user_id= request.getParameter("user_id");
    passwd= request.getParameter("password");
    [boolean bError=(user_id==null)||(passwd==null)||m_DataBase .validateUser(user_id,passwd,false)==-1); htmlPage= "";]

    int nUserID=m_DataBase.validateUser(user_id,passwd,fal se);
    dbService Service=m_DataBase.getServiceByAdminID(Integer.toS tring(nUserID));

    if (!bError)
    {
    htmlPage+=PrintHeader(user_id,passwd);
    }

    if (action.equals("login"))
    {
    if (!bError)
    {
    htmlPage+="<br><div align='center'><font face='Verdana' size='5'>WELCOME</font></div>";
    }
    else
    {
    htmlPage+="<div align='center'><br><font face='Verdana' size='5'>Login error</font><br>";
    htmlPage+="<a href='http://localhost:8080/testing'>Go back</a></font></div>";
    }
    }
    else if (action.equals("rest_mod_menu"))

  2. #2
    r035198x is offline Senior Member
    Join Date
    Aug 2009
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    Default

    1.) One of the variables being accessed at line 183 is null.
    2.) Constructing view pages in servlets was done around 1998 when there was no JSP. Please don't do it these days (for your sake).

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