解决异常ognl.OgnlException: source is null for getProperty(null, "token")
异常如下2010-03-1309:26:06,224INFO[STDOUT](http-0.0.0.0-8080-3)09:26:06,223WARN[OgnlValueStack]Errorsettingexpression'struts.token.name'withvalue'[Ljava.lang.String;@5cfe5cfe'ognl.OgnlException:sourceisnu