java - RuntimeException 导致 200 OK 状态

Question

我拥有:AEM 6.4 实例。如果我的代码中的某个地方出现 RuntimeException 错误，我的页面将返回 200 OK 状态。为了解决这个问题，我尝试做Filter。

@SlingFilter( order = Integer.MIN_VALUE, scope = SlingFilterScope.REQUEST)
public class RuntimeExceptionFilter implements javax.servlet.Filter {

    @Override
    public final void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        SlingHttpServletResponse slingResponse = (SlingHttpServletResponse) response;

        try {
            chain.doFilter(request, response);
        } catch (RuntimeException ex) {
            slingResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }
    }
}

现在我可以捕获请求，这会导致 RuntimeException，但是 slingResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

返回“java.lang.IllegalStateException:响应已提交”。可能是什么原因呢？或者可以通过其他方式让页面在发生 RuntimeException 时返回 500 Status 吗？

堆栈跟踪:

Caused by: java.lang.IllegalStateException: Response has already been committed
    at org.apache.sling.engine.impl.SlingHttpServletResponseImpl.checkCommitted(SlingHttpServletResponseImpl.java:424) [org.apache.sling.engine:2.6.16]
    at org.apache.sling.engine.impl.SlingHttpServletResponseImpl.sendError(SlingHttpServletResponseImpl.java:170) [org.apache.sling.engine:2.6.16]
    at org.apache.sling.engine.impl.SlingHttpServletResponseImpl.sendError(SlingHttpServletResponseImpl.java:165) [org.apache.sling.engine:2.6.16]
    at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:127) [org.apache.felix.http.servlet-api:1.1.2]
    at my.project.RuntimeExceptionFilter.doFilter(RuntimeExceptionFilter.java:49)

Answer 1

正如异常文本所示，响应已在引发异常之前发送。这里讨论了类似的问题:Response has aready been committed

首先尝试找出 HTTP 响应到底在哪个点返回。一旦你发现你可以解决它。

我对 AEM 内部不太熟悉(几乎没有实际操作经验)，但很可能有一些包装器(可能是 Aspect)在某个时刻被触发并返回带有 200 的 HTTP 响应。