HTTP Status 500 - type Exception report

[gladiator]

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"))

[r035198x]

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).