java.lang.StackOverflowError - Guice and Google App Engine

[xybrek via StackOverflow]

I mapped a servlet in my application like this with Google Guice:

protected void configureServlets() {
 serve("/_ah/*").with(DatastoreViewerServlet.class);
}

And I get this StackOverFlow error:

[ERROR] java.lang.StackOverflowError
[ERROR]     at java.lang.String.startsWith(String.java:1408)
[ERROR]     at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:427)
[ERROR]     at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.removeAttribute(Dispatcher.java:461)
[ERROR]     at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:441)
[ERROR]     at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.removeAttribute(Dispatcher.java:461)
[ERROR]     at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.setAttribute(Dispatcher.java:441)
[ERROR]     at org.mortbay.jetty.servlet.Dispatcher$ForwardAttributes.removeAttribute(Dispatcher.java:461)

When the path is accessed, why is that?

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