[FIXED] How to throw spring security AuthenticationException or proceed to unsuccessfulAuthentication

Issue

I want to throw AuthenticationException in my overriden attemptAuthentication from my class that extendsUsernamePasswordAuthenticationFilter method but I don't know how to do so.
My code:

@Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(username, password);
        if(portService.getOpenPort()==null){
            //'AuthenticationException' is abstract; cannot be instantiated
            throw new AuthenticationException("No free port found");
        }
        return authenticationManager.authenticate(authenticationToken);
    }

Is it only meant to be used in try catch clause, If so is there any other way to make filter proceed to unsuccessfulAuthentication?

Solution

You should create your own subclass of AuthenticationException, like BadCredentialsException does.

You can probably create a:

public class NoOpenPortAuthenticationException extends AuthenticationException {

    public NoOpenPortAuthenticationException(String msg) {
        super(msg);
    }

}

And in your code do: throw new NoOpenPortAuthenticationException("No free port found");

Answered By - Marcus Hert da Coregio
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)