Hi, all! Could someone, please, help me out with this? I'm confused...
I have a servlet that generates a form.
On submitting the form, the same servlet is called with the new parameters.
In the servlet I check if the Submit button was pressed and
if so - call validateLogin() method to validate the user's name. (some code
is shown below). Everything worked fine when I was testing this with
JSDK2.0 servletrunner (JDK1.1.7), but when I moved to Apache1.1.6+JServ1.0
I get errors like this: (from jserv.log file:)
[13/07/1999 11:58:44:920 EDT] Status: 500 Internal Server Error
[13/07/1999 11:58:44:920 EDT] Servlet-Error: java.lang.NullPointerException:
null
[13/07/1999 11:58:44:920 EDT] Content-Type: text/html
[13/07/1999 11:58:44:920 EDT] Set-Cookie:
JServSessionId=3fd6e3893988feb8.2.931881524917; path=/
[13/07/1999 11:58:44:921 EDT] java.lang.NullPointerException
at LoginScreen.validateLogin(Compiled Code)
at LoginScreen.doPost(Compiled Code)
at LoginScreen.doGet(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at org.apache.jserv.JServConnection.processRequest(Compiled Code)
at org.apache.jserv.JServConnection.run(Compiled Code)
at java.lang.Thread.run(Compiled Code)
Here is the relevant code:
public class LoginScreen extends HttpServlet
{
...
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
...
HttpSession session = req.getSession(true);
String userid = req.getParameter("userid");
String submit = req.getParameter("submit");
if ( submit != null ) {
if ( (userid != null) && !userid.equals(" ")
&& validateLogin(session, userid)) {
toClient.println("<HTML><BODY>Login success!</BODY></HTML>");
}
else {
toClient.println("<HTML><BODY> Login failed</BODY></HTML>");
}
}
...
}
private boolean validateLogin(HttpSession session, String userid) {
String user_name = null;
Statement select_st;
String query = "select user_name from log_table where userid = '" +
userid.toUpperCase().trim() + "'";
try {
select_st = con.createStatement();
ResultSet rs = select_st.executeQuery(query);
if ( rs.next() ) {
session.putValue("userid", userid);
user_name = rs.getString("user_name");
session.putValue("user_name", user_name);
} else
return false;
rs.close();
select_st.close();
return true;
}
catch (SQLException sqe){ ... }
catch (IllegalStateException e) { ... }
}
thank you very much,
Marina
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