I have a simple controller that calls forward_to "/foo.jsp", but the forward fails with this message:

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SEVERE: PWC6117: File "/Users/vivek/dev/demo/j12009/myapp/tmp/war/foo.jsp/foo.jsp" not found
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The root cause of this failure is that ServletRackEnvironment.getPathInfo() forces a path-info to be returned for JSP. This breaks servlet spec compliance.
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There is an example in the Servlet spec for this, see Section 3.5
("Request Path Elements") of the Servlet 3.0 spec:

TABLE 3-1 ("Example Context Set Up"):

Servlet Mapping Pattern: *.jsp
Servlet: JSPServlet

TABLE 3-2 ("Observed Path Element Behaviour"):

/catalog/help/feedback.jsp

ContextPath: /catalog
ServletPath: /help/feedback.jsp
PathInfo: null
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Servlet 2.5 sec 3.4 Table 2 has this example as well.

I would expect ServletPath to be equal to /foo.jsp, and PathInfo to be empty.

The following patch on jruby-rack 0.9.4 fixes the issue:

— a/src/main/java/org/jruby/rack/servlet/ServletRackEnvironment.java
+++ b/src/main/java/org/jruby/rack/servlet/ServletRackEnvironment.java
@@ -44,6 +44,9 @@ public class ServletRackEnvironment extends HttpServletRequestWrapper

• @return full path info
  */
  @Override public String getPathInfo() {
  + // If it is a JSP then we dont want to manipulate path-info.
  + if(getServletPath().endsWith(".jsp"))
  + return super.getPathInfo();
  StringBuffer pathInfo = new StringBuffer("");
  if (getServletPath() != null) {