Java @ExceptionHandler不支持的参数

我正在使用Spring的@ExceptionHandler注释捕获控制器中的异常

当方法的签名中没有参数时，它工作正常（方法被调用），例如

我的目标是在捕获异常时执行重定向。但当我添加一些参数时，例如HttpServletResponse：

@ExceptionHandler(PortletSessionRequiredException.class)
public void handleExpiredSession(HttpServletResponse response) {
    log.error("Session is not available.");

    try {
        response.sendRedirect("www.example.com");
    } catch (IOException e) {
        e.printStackTrace();
    }
}

调用该方法时，我得到以下异常：

org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver doResolveException
SEVERE: Invoking request method resulted in exception : public void ...portlet.BaseController.handleExpiredSession(javax.servlet.http.HttpServletResponse)
java.lang.IllegalStateException: Unsupported argument [javax.servlet.http.HttpServletResponse] for @ExceptionHandler method: public void ...portlet.BaseController.handleExpiredSession(javax.servlet.http.HttpServletResponse)
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.resolveHandlerArguments(AnnotationMethodHandlerExceptionResolver.java:243)
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.doResolveException(AnnotationMethodHandlerExceptionResolver.java:115)
    at org.springframework.web.portlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:129)
    at org.springframework.web.portlet.DispatcherPortlet.processHandlerException(DispatcherPortlet.java:1216)
    at org.springframework.web.portlet.DispatcherPortlet.doRenderService(DispatcherPortlet.java:784)
    at org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:523)
    at org.springframework.web.portlet.FrameworkPortlet.doDispatch(FrameworkPortlet.java:471)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
    at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:103)
    ...

根据，HttpServletResponse是一个有效的参数。 我试着用谷歌搜索它，但是关于ExceptionHandler的不受支持的参数异常的帖子并不多。有人知道为什么它在没有争论的情况下工作，但在有争论的情况下却不行吗？非常感谢您的帮助

我正在使用Spring3.2.0

编辑

谢谢，迪纳姆先生，我还没有意识到我不能使用HttpServletRequest。现在，当我将其更改为ActionResponse（我相信这是我应该使用的，当我想重定向时）：

我遇到了以下异常：

org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver doResolveException
SEVERE: Invoking request method resulted in exception : public void ...portlet.BaseController.handleExpiredSession(javax.portlet.ActionResponse)
java.lang.IllegalStateException: Standard argument type [javax.portlet.ActionResponse] resolved to incompatible value of type [class com.liferay.portlet.RenderResponseImpl]. Consider declaring the argument type in a less specific fashion.
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.resolveCommonArgument(AnnotationMethodHandlerExceptionResolver.java:276)
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.resolveHandlerArguments(AnnotationMethodHandlerExceptionResolver.java:238)
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.doResolveException(AnnotationMethodHandlerExceptionResolver.java:115)
    at org.springframework.web.portlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:129)
    at org.springframework.web.portlet.DispatcherPortlet.processHandlerException(DispatcherPortlet.java:1216)
    at org.springframework.web.portlet.DispatcherPortlet.doRenderService(DispatcherPortlet.java:784)
    at org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:523)
    at org.springframework.web.portlet.FrameworkPortlet.doDispatch(FrameworkPortlet.java:471)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
    ...

---

我现在做错了什么？

您所处的环境是portlet环境，而不是servlet环境。因此，您有一个

PortletRequest

而不是

HttpServletRequest

。

@ExceptionHandler(PortletSessionRequiredException.class)
public void handleExpiredSession(ActionResponse response) {
    log.error("Session is not available.");

    try {
        response.sendRedirect("www.example.com");
    } catch (IOException e) {
        e.printStackTrace();
    }
}

org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver doResolveException
SEVERE: Invoking request method resulted in exception : public void ...portlet.BaseController.handleExpiredSession(javax.portlet.ActionResponse)
java.lang.IllegalStateException: Standard argument type [javax.portlet.ActionResponse] resolved to incompatible value of type [class com.liferay.portlet.RenderResponseImpl]. Consider declaring the argument type in a less specific fashion.
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.resolveCommonArgument(AnnotationMethodHandlerExceptionResolver.java:276)
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.resolveHandlerArguments(AnnotationMethodHandlerExceptionResolver.java:238)
    at org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver.doResolveException(AnnotationMethodHandlerExceptionResolver.java:115)
    at org.springframework.web.portlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:129)
    at org.springframework.web.portlet.DispatcherPortlet.processHandlerException(DispatcherPortlet.java:1216)
    at org.springframework.web.portlet.DispatcherPortlet.doRenderService(DispatcherPortlet.java:784)
    at org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:523)
    at org.springframework.web.portlet.FrameworkPortlet.doDispatch(FrameworkPortlet.java:471)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
    ...