struts2注解方式上传文件如何设置maximumSize

[Anoth]

action方法上的配置如下：
@Action(value="upload",
interceptorRefs ={ @InterceptorRef(value="fileUploadStack",params={"allowedTypes","image/bmp,image/png,image/gif,image/pjpeg,image/jpg","maximumSize","1048576"}),
@InterceptorRef("defaultStack")},
results ={ @Result(name = "success", location = "/upload.jsp"),
@Result(name = "input", location = "/fail.jsp") })

启动时显示：
WARN [localhost-startStop-1] (CommonsLogger.java:60) - No interceptor found for name = maximumSize
WARN [localhost-startStop-1] (CommonsLogger.java:60) - No interceptor found for name = allowedTypes
文件类型、大小限制没有起作用。难道不是在params里面配置吗，应该如何配置？