shiro 动态更新权限配置：报错

求教，代码执行了，配置也写进去了，但是拦截没生效，

public void updatePermission() {
		synchronized (shiroFilterFactoryBean) {
			AbstractShiroFilter shiroFilter = null;
			try {
				shiroFilter = (AbstractShiroFilter) shiroFilterFactoryBean.getObject();

				// 获取过滤管理器
				PathMatchingFilterChainResolver filterChainResolver = (PathMatchingFilterChainResolver) shiroFilter.getFilterChainResolver();
				DefaultFilterChainManager manager = (DefaultFilterChainManager) filterChainResolver.getFilterChainManager();

				// 清空初始权限配置
				manager.getFilterChains().clear();
				shiroFilterFactoryBean.getFilterChainDefinitionMap().clear();

				// 重新构建生成
				shiroFilterFactoryBean.setFilterChainDefinitionMap(obtainPermission());

				Map<String, String> chains = shiroFilterFactoryBean.getFilterChainDefinitionMap();
				for (Map.Entry<String, String> entry : chains.entrySet()) {
					manager.createChain(entry.getKey(), entry.getValue().trim().replace(" ", ""));
					System.err.println(entry.toString());
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}