code: protected RequestSecurityProcessor getLastProcessorInChain(final FilterChain chain) {
          return new RequestSecurityProcessor() {
  
              public void processRequest(RequestContext context, RequestSecurityProcessorChain processorChain) throws
                  Exception {
                  chain.doFilter(context.getRequest(), context.getResponse());
              }
  
          };
      }
docs: Returns the last processor of the chain, which should actually call the {@link FilterChain}.