How to use

getAuthenticationManager

method

in

org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter

public Authentication attemptAuthentication(HttpServletRequest request,
    HttpServletResponse response) throws AuthenticationException {
  if (postOnly && !request.getMethod().equals("POST")) {
    throw new AuthenticationServiceException(
        "Authentication method not supported: " + request.getMethod());
  }
  String username = obtainUsername(request);
  String password = obtainPassword(request);
  if (username == null) {
    username = "";
  }
  if (password == null) {
    password = "";
  }
  username = username.trim();
  UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(
      username, password);
  // Allow subclasses to set the "details" property
  setDetails(request, authRequest);
  return this.getAuthenticationManager().authenticate(authRequest);
}