IllegalStateException Error

Question

I am creating a login page where Engineer can login through their username started with "engg". The problem is in the login page when I am giving the right input with right password it gives "Illegal State Exception".In wrong inputs it works fine.Like When i am giving "engg140" present in my oracle table it is giving the exception.the code is:

     import java.io.IOException;
      import java.io.PrintWriter;
        import java.sql.ResultSet;
      import java.sql.SQLException;

      import javax.servlet.ServletException;
      import javax.servlet.http.HttpServlet;
      import javax.servlet.http.HttpServletRequest;
      import javax.servlet.http.HttpServletResponse;

      import sun.java2d.pipe.GeneralCompositePipe;

       import accessdb.Dao;
         import accessdb.Getset;

    public class AdminLogIn extends HttpServlet {
 private static final long serialVersionUID = 1L;

/**
 * @return 
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    try {
    String username=request.getParameter("username"); 
    String password=request.getParameter("password");
    Getset g=new Getset();
    Dao dao=new Dao();

               if(username.equals("") || password.equals(""))

           {
                response.sendRedirect("login.jsp");

             }
         else{
    String newuname=username.substring(0,4);
//  System.out.println(""+username);
    if(newuname.equals("engg"))
    {
        ResultSet rs=dao.EnggLogInUseridCheck(g);

        System.out.println(""+newuname);

        while(rs.next())
        {
            String uname=rs.getString("uname");
            System.out.println(""+uname);
            if(uname.equals(username))
            {
                g.setuname(username);
                System.out.println(""+username);
                System.out.println(""+uname);
                ResultSet rs1=dao.EnggLogInPasswordCheck(g);
                while(rs1.next())
                {
                    String password1=rs1.getString("password");
                    if(password1.equals(password))
                    {    System.out.println(""+password1);
                         System.out.println(""+password);
                        response.sendRedirect("engghome.jsp");
                        break;

                    }
                    else
                    {
                        response.sendRedirect("login.jsp");
                        return;
                    }
                }

            }

        }
        response.sendRedirect("login.jsp");
    }
    else
    {
        response.sendRedirect("login.jsp");
        return;
    }



    }


    }   catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }
          }

The console output for a right input is as follows:

                     03:31:26,265 INFO  [STDOUT] engg
                           03:31:26,265 INFO  [STDOUT] engg172
                          03:31:26,265 INFO  [STDOUT] engg140
                          03:31:26,265 INFO  [STDOUT] engg140
                          03:31:26,265 INFO  [STDOUT] engg140
                         03:31:26,281 INFO  [STDOUT] 365125
                          03:31:26,281 INFO  [STDOUT] 365125
                           03:31:26,281 INFO  [STDOUT] engg141
                           03:31:26,281 ERROR [[AdminLogIn]] Servlet.service() for 
                              servlet                      
                          AdminLogIn threw exception
                           java.lang.IllegalStateException
                           at                                                                                       org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:435)
                         at AdminLogIn.doGet(AdminLogIn.java:80)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

What line is throwing the exception? Also, can you post the exception text? — Hovercraft Full Of Eels, Jul 08 '12 at 22:04
You have probably asked the same question (at least) twice and deleted the previous one. — Lion, Jul 08 '12 at 22:10
side comment - did you look into spring or just struts? Also, are you looking into hashing passwords? As per note above, stack trace would help more — ali haider, Jul 08 '12 at 22:10
In getset I get and set values for different fields.and in Dao I declared all the functions of LogInCheck and PasswordCheck is done. — Mistu4u, Jul 09 '12 at 06:19

score 3 · Accepted Answer · answered Jul 09 '12 at 03:35

You did not included the "caused by" sections of the stack trace, which are the most important part (actually, the WHOLE stack trace is important).

An, IllegalStateException on a sendRedirect() has to do with the HTTP protocol, and occurs when the response to the client has already been committed. At this point it is not possible to send a redirect any more as the HTTP headers have been sent (or at least queued to be sent) and cannot be changed. Somewhere in your code, in a method you haven't shown, you have written something to the output stream and caused the response to be committed.

This has nothing to do with the database.

OK, that doesn't change the answer. You have already committed the response. — Jim Garrison, Jul 09 '12 at 07:04

score 3 · Answer 2 · edited May 23 '17 at 12:12

3

I think the response is already committed which is not allowing you to do redirect.

Look here for more information:

edited May 23 '17 at 12:12

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answered Jul 09 '12 at 05:59

Ramesh PVK

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IllegalStateException Error

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