Set<String> roleSet;

        try {
            roleSet = buildByHeader(roleQueryHelperImpl, getMockRequest());
            fail();
        } catch (final NullPointerException e) {
            //ok
        }

        roleQueryHelperImpl.headerKey = "fess1";

        getMockRequest().addHeader("aaa", "bbb");
        roleSet = buildByHeader(roleQueryHelperImpl, getMockRequest());