shiro错误No SecurityManager accessible to the calling code

Shire在Web.xml中shiroFilter的Mapping配置错误

org.apache.shiro.UnavailableSecurityManagerException: No SecurityManager accessible to the calling code, either bound to the org.apache.shiro.util.ThreadContext or as a vm static singleton.  This is an invalid application configuration.

at org.apache.shiro.SecurityUtils.getSecurityManager(SecurityUtils.java:123)

at org.apache.shiro.subject.Subject$Builder.<init>(Subject.java:627)

at org.apache.shiro.SecurityUtils.getSubject(SecurityUtils.java:56)

at com.feinno.module.security.web.JsonLoginController.login(JsonLoginController.java:41)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

出错的原因在于没有配置shiroFilter,应该在web.xml加入代码：

<!-- shiro -->
<filter> 
    <filter-name>shiroFilter</filter-name> 
    <filter-class>
        org.springframework.web.filter.DelegatingFilterProxy
    </filter-class> 
</filter> 
<filter-mapping> 
    <filter-name>shiroFilter</filter-name> 
    <url-pattern>/*</url-pattern> 
</filter-mapping>