SecurityFilter.doFilter(SecurityFilter.java:120)

I'm developing a web server, with tomcat 5.0 as server IDE netbeans
I have a problem with login page
I have this web.xml file:

Code:

---

<login-config>
<auth-method>FORM</auth-method>
<realm-name>GlucoWeb</realm-name>
<form-login-config>
<form-login-page>/login.htm</form-login-page>
<form-error-page>/login.htm</form-error-page>
</form-login-config>
</login-config>

---

Then when I execute it, this problem appears:

Code:

---

java.lang.NullPointerException
org.securityfilter.filter.SecurityFilter.doFilter( SecurityFilter.java:120)
2007-06-21 10:23:30 StandardWrapperValve[jsp]: Servlet.service()
java.lang.NullPointerException
at org.securityfilter.filter.SecurityFilter.doFilter( SecurityFilter.java:120)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:186)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invo keInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.authenticator.AuthenticatorBas e.invoke(AuthenticatorBase.java:540)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invo keNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(Co yoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.processConnection(Http11Protocol.jav a:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(P oolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:595)

---

any ideas???????

can you paste the code?

yes

Code:

---

package glucoweb;

import javax.naming.*;
import javax.sql.*;
import java.sql.*;

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;

import org.apache.struts.* ;



public class LoginFilter implements Filter
{
private ServletContext context = null;
private DataSource dataSource = null;

protected FilterConfig filterConfig;

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
 throws IOException, ServletException
{
/* org.apache.log4j.BasicConfigurator.configure(); */
String userID = null;

HttpSession session = ((HttpServletRequest)request).getSession();

//check if object userbean is present in session
if (session.getAttribute("user") == null)
{
//if not, get user data and load it as a session bean
userID = ((HttpServletRequest)request).getRemoteUser();

User user = new User();

String.
context = filterConfig.getServletContext();
dataSource = (DataSource) context.getAttribute(Globals.DATA_SOURCE_KEY);

try {
user = GlucoWebData.getUser(userID,dataSource);
System.err.println("LoginFilter: " + user.getUserID());
System.err.println("LoginFilter: " + user.getRole());
} catch( Exception e ) {

System.err.println("LoginFilter - Setting target to error");

}
session.setAttribute("user", user);


} else if (((User)session.getAttribute("user")).getUserID() == null)
{
//if not, get user data and load it as a session bean
userID = ((HttpServletRequest)request).getRemoteUser();

User user = new User();



 String.
context = filterConfig.getServletContext();
dataSource = (DataSource) context.getAttribute(Globals.DATA_SOURCE_KEY);

try {
user = GlucoWebData.getUser(userID,dataSource);
System.err.println("LoginFilter: " + user.getUserID());
System.err.println("LoginFilter: " + user.getRole());
} catch( Exception e ) {

System.err.println("LoginFilter - Setting target to error");

}
session.setAttribute("user", user);

}

// pass the request on
chain.doFilter(request, response);
}

public void init(FilterConfig config) throws ServletException
{
this.filterConfig = config;
}

public void destroy()
{
}

}

---

Check line 120
there is the problem
I don't know what is it because I don't have the numbers.

I think that you are using an object without a correct initializing
check it