why does it show nullpointerexception at the time of dispatching?
- From: "Manoj Jain" <Manoj.S.J@xxxxxxxxx>
- Date: 5 Jun 2006 06:28:44 -0700
import is ok
public class SubModelActionServlet extends HttpServlet {
Connection conn=null;
Statement stmt=null;
ResultSet res=null;
InitialContext ic=null;
RequestDispatcher rd=null;
protected void processRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
conn=(Connection)request.getSession().getAttribute("connection");
if(conn==null)
{
try
{
ic= new InitialContext();
DataSource
ds=(DataSource)ic.lookup("jdbc/proformaInvoice");
conn=ds.getConnection();
request.getSession().setAttribute("connection",conn);
}catch(NamingException ne){}
catch(SQLException se){}
catch(Exception e){}
}
int action
=Integer.parseInt(request.getParameter("hidAction"));
switch(action)
{
case 1:
createSubModel(request,response);
rd=getServletContext().getRequestDispatcher("/SubModelView.jsp");
break;
case 2:
rd=getServletContext().getRequestDispatcher("/SubModelView.jsp");break;
case 3:
rd=getServletContext().getRequestDispatcher("/SubModelView.jsp");break;
}
try{rd.forward(request,response);}
catch(Exception e){out.write(e)} //here it shows null
pointer exception. why?
//from second page, it successfully dispatch
}
private void createSubModel(HttpServletRequest
request,HttpServletResponse response)
{
String query="";
Vector<ConcreteSubModelDTO> vSubModel=new
Vector<ConcreteSubModelDTO>();
int mIndex=Integer.parseInt(request.getParameter("cmbModel"));
int SIndex=0;
PreparedStatement pstmt=null;
String subModel=request.getParameter("txtSubModel");
query="select max(\"SIndex\") from \"SubModelMaster\" ";
try
{
stmt=conn.createStatement();
res=stmt.executeQuery(query);
while(res.next())
{
SIndex=res.getInt(1);
}
SIndex++;
}
catch(SQLException se){}
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
.
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