Java lang null pointer exception

Question

Hi
I am trying to retrieve data from db and display in jsp.i am getting null pointer exception.connecting to db code is all fine .
i am using it for the other pages also
below is my code
package updates;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.RequestDispatcher;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import Database.ConnectionPoolingPacs;
import java.sql.Blob;
public class EditBug extends HttpServlet {
    Connection connect=null;
    Statement stmt=null;
    ResultSet rs=null;
    ConnectionPoolingPacs Con=null;
    String BUGTITLE="";
    String SEVERITY ="";
    String BUG_ID="";
    String PROBABILITY="";
    String AUTHOR="";
    Blob  BUGDESCRIPTION1,ASSIGNEECOMMENTS1,CLOSINGCOMMENTS1=null;
    RequestDispatcher dispatcher=null;
    String STATUS,ASSIGNEDTO,CLOSEDBY=null;
    String IDENTIFIEDON,ASSIGNEDON,CLOSEDON=null;
    String BUGDESCRIPTION,ASSIGNEECOMMENTS,CLOSINGCOMMENTS=null;
    @Override
    public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
     response.setContentType("text/html");
     BUG_ID=request.getParameter("bugID");
              try
              Con=new ConnectionPoolingPacs();
              connect=Con.getConnection();
              stmt=connect.createStatement();
              String QueryStringTest="Select * from bugdetails where Bug_Id ='"+ BUG_ID+"' ";
              rs=stmt.executeQuery(QueryStringTest);
              while (rs.next())
                BUG_ID=rs.getString("Bug_ID");
                BUGTITLE= rs.getString("Bug_Title") ;
                BUGDESCRIPTION1=rs.getBlob("Bug_Description1");
                AUTHOR=rs.getString("Bug_Author");
                SEVERITY=rs.getString("Bug_Severity");
                PROBABILITY=rs.getString("Bug_Probability");
                STATUS=rs.getString("Bug_Status");
                IDENTIFIEDON=rs.getString("Bug_IdentifiedOn");
                ASSIGNEDON=rs.getString("Bug_assignedOn");
                ASSIGNEDTO=rs.getString("Bug_AssignedTo");
                ASSIGNEECOMMENTS1=rs.getBlob("AssigneeComments");
                CLOSEDON=rs.getString("Bug_ClosedOn");
                CLOSEDBY=rs.getString("Bug_ClosedBy");
               CLOSINGCOMMENTS1=rs.getBlob("ClosingComments");
                request.setAttribute("id",BUG_ID);
                request.setAttribute ("title",BUGTITLE);
                request.setAttribute ("author",AUTHOR);
                request.setAttribute ("severity",SEVERITY);
                request.setAttribute ("probability",PROBABILITY);
                request.setAttribute ("status",STATUS);
                request.setAttribute ("identifiedon",IDENTIFIEDON);
                if ((ASSIGNEDON).equals("1001-01-01"))
                    ASSIGNEDON="";
                request.setAttribute ("assignedon", ASSIGNEDON);
                request.setAttribute ("assignedto", ASSIGNEDTO);
                 if ((CLOSEDON).equals("1001-01-01"))
                    CLOSEDON="";
                request.setAttribute ("closedon", CLOSEDON);
                request.setAttribute ("closedby", CLOSEDBY);
                byte[] buffer1 = BUGDESCRIPTION1.getBytes(1, (int) BUGDESCRIPTION1.length());
                 BUGDESCRIPTION  = new String(buffer1);
                 byte[] buffer2 = ASSIGNEECOMMENTS1.getBytes(1, (int) ASSIGNEECOMMENTS1.length());
                ASSIGNEECOMMENTS  = new String(buffer2);
                 byte[] buffer3 = CLOSINGCOMMENTS1.getBytes(1, (int)  CLOSINGCOMMENTS1.length());
                CLOSINGCOMMENTS  = new String(buffer3);
                 request.setAttribute ("description",BUGDESCRIPTION);
                if(ASSIGNEECOMMENTS!=null)
                 request.setAttribute ("assignecomments",ASSIGNEECOMMENTS);
                 if(CLOSINGCOMMENTS!=null)
                 request.setAttribute ("closingcomments", CLOSINGCOMMENTS);
                stmt.close();
                rs.close();
      catch(Exception e){System.out.println("Exception  ;"+e);}
          dispatcher = request.getRequestDispatcher("/EditBug.jsp");
          dispatcher.forward(request, response);
    }I have set 1001-01-01 as the default date.

Answer 1

This is the exception which i am getting
Aug 12, 2009 2:24:18 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet EditBug threw exception
java.lang.NullPointerException
at org.apache.jsp.EditBug_jsp._jspService(EditBug_jsp.java:703)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at updates.EditBug.doPost(EditBug.java:124)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
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:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
and that line which its indicating as error is
dispatcher.forward(request, response);
Edited by: garlapati on Aug 12, 2009 8:55 AM