Unable to autowire the service inside my authentication filter in Spring

Question

I am trying to authenticate user by token, But when i try to auto wire one my services inside the AuthenticationTokenProcessingFilter i get null pointer excepti

Answer 1

I just made it work by adding

SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);

I am unsure why we should do this even when i tried adding explicit qualifier. and now the code looks like

public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {

        SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this);

        @SuppressWarnings("unchecked")
        Map parms = request.getParameterMap();

        if (parms.containsKey("token")) {