Question

我正在Equinox上部署GWT应用程序。它运行，但当我启动一个事件来调用服务器时，我有一个这样的错误：

<title>Error 500 non-HTTP request or response</title>
</head>
<body><h2>HTTP ERROR 500</h2>
<p>Problem accessing /zbapp/zbapp/app. Reason:
<pre>    non-HTTP request or response</pre></p><h3>Caused by:</h3><pre>javax.servlet.ServletException: non-HTTP request or response

at javax.servlet.http.HttpServlet.service(HttpServlet.java:715)

at org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)

at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)

at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126)

at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:60)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

at org.eclipse.equinox.http.jetty.internal.HttpServerManager$InternalHttpServiceServlet.service(HttpServerManager.java:318)

at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)

at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)

at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)

at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)

at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)

at org.mortbay.jetty.Server.handle(Server.java:326)

at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)

at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:939)

at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)

at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)

at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)

at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)

at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

</pre>
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我的web.xml是：

<servlet>
 <servlet-name>greetServlet</servlet-name>
 <servlet-class>main.java.com.gwt.app.server.GreetingServiceImpl</servlet-class>
</servlet>

<servlet-mapping>
 <servlet-name>greetServlet</servlet-name>
 <url-pattern>/zbapp/app</url-pattern>
</servlet-mapping>

我不知道该错误的原因是什么。我在GWT服务的实现中从HttpServlet覆盖了服务方法。

有人可以帮助我吗？

Answer 1

由于这个原因，它失败了

try {
        request = (HttpServletRequest) req;
        response = (HttpServletResponse) res;
    } catch (ClassCastException e) {
        throw new ServletException("non-HTTP request or response");
    }

请求/响应 不属于 HttpServletRequest / HttpServletResponse 类型。

在代码中的某处，您尝试使用扩展ServletRequest / ServletResponse 的类来包装 请求/响应。如果应用程序想要 包装请求/响应，则理想情况下，包装类应该扩展HttpServletRequestWrapper / HttpServletResponseWrapper 。

运行时HTTPServlet错误

1 个答案: