JAX-RS container response filter

JWTResponseFilter.java

public class JWTResponseFilter implements ContainerResponseFilter {

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
        System.out.println("response filter invoked...");
        if (requestContext.getProperty("auth-failed") != null) {
            Boolean failed = (Boolean) requestContext.getProperty("auth-failed");
            if (failed) {
                System.out.println("JWT auth failed. No need to return JWT token");
                return;
            }
        }

        List<Object> jwt = new ArrayList<Object>();
        jwt.add(requestContext.getHeaderString("Authorization").split(" ")[1]);
        responseContext.getHeaders().put("jwt", jwt);
        System.out.println("Added JWT to response header 'jwt'");

    }
}