Problem invoking filter

[Murtuza Akhtari]

I am using form based authentication and so i have, in my login.jsp

<form method = "POST" action = "j_security_check">

Also I have a filter to do some post login processing..but my filter is not invoked although i can log in correctly using LDAP

it is defined in my web.xml as follows

<filter>
<filter-name>LoginFilter</filter-name>
<display-name>LoginFilter</display-name>
<filter-class>com.test.login.servlets.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/j_security_check</url-pattern>
</filter-mapping>

Am I doing this right?
What url-pattern do I have to map to? I dont have any other servlet in this(just the one created by the j_security_check)

my doFilter method is :

public void doFilter(
ServletRequest req,
ServletResponse resp,
FilterChain chain)
throws ServletException, IOException {
 
chain.doFilter(req, resp);
try{

HttpSession session = (( HttpServletRequest ) req ).getSession( false );
String username = req.getParameter(" j_username ");
System.out.println(" The j_username obtained is = " + username );
ArrayList arrList = ldapSearch.search(" uid = " + username );
//arrList.add(username);
userVO = DelegateMgr.getUserBean();
req.setAttribute(" UserVO ",userVO );
session.setAttribute(" UserVO ",userVO );
}catch( Exception e ){
//TO DO : log using logger
e.printStackTrace();
}
My init method:
 
public void init(FilterConfig config) throws ServletException {
this.config = config;
 
}

Can someone help me as to where I am going wrong?
Thanks in advance.
[ November 24, 2004: Message edited by: Murtuza Akhtari ]