AppEngine Development Server在JSP中提供StackOverflowError [英] AppEngine Development Server gives StackOverflowError in JSP

问题描述

我正在使用 JSP 文件中的以下代码，该文件是从 AppEngine serlvet提供的。

I'm using the following code in a JSP file which I serve from an AppEngine serlvet.

<script type="text/javascript" >
    var role = <%= request.getAttribute("role") %>;
</script>

该变量是从 Servlet ：

req.setAttribute("role", role );
req.getRequestDispatcher("index.jsp").forward(req, resp);

代码在AppEngine生产中运行正常，但在本地开发服务器中，我立即得到以下内容： / p>

The code runs fine on AppEngine production but in the local development server I get the following straight away:

Problem accessing /. Reason:

INTERNAL_SERVER_ERROR
Caused by:

java.lang.StackOverflowError
at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:438)
at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:438)
at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:438)
at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:438)
at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:438)
at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:438)
at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:438)

这样就像永远。在调试时，我也可以看到Servlet代码被称为无休止的时间。

this goes on like forever. While debugging, I can also see that the Servlet code is called endless times.

我发现几个引用AppEngine生产的类似问题，但发现AppEngine没有可行的修复开发服务器。

I found a few references to a similar problem with AppEngine production but found no workable fix for AppEngine development server.

任何想法？

推荐答案

当使用Google App Engine从servlet转发到JSP时，甚至没有明确设置任何变量也是类似的问题，我所有的都是这样的：

I ran into a similar issue when forwarding to a JSP from a servlet using Google App Engine without even explicitly setting any variables, all I had was the line:

req.getRequestDispatcher("game.jsp").forward(req, resp);

在我的情况下，原来是因为在web.xml中我有以下行（注意catch -all url-pattern：

In my case it turned out to because in web.xml I had the following line (note the catch-all url-pattern:

<servlet-mapping>
    <servlet-name>GameServlet</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

我认为这也是捕捉JSP路径，因此循环，当我更改它也不是一个catch-all它的工作原理如下：

I think this was also catching the JSP path and therefore looping. When I change it too not be a catch-all it works. As in:

<servlet-mapping>
    <servlet-name>GameServlet</servlet-name>
    <url-pattern>/game</url-pattern>
</servlet-mapping>

这篇关于AppEngine Development Server在JSP中提供StackOverflowError的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！