Hi,
I've got the same problem, and haven't solved it yet!
I guess it is the JSP to Servlet creation and compilation, but I'm not sure.
The files are working on a weblogic training setup.
server.log:
...
2003-02-14 15:02:37,631 INFO [org.jboss.deployment.MainDeployer] Deployed package: file:/F:/JAVA/jboss-3.0.4/server/all/deploy/j2eeanvendelseejb.jar
2003-02-14 15:05:12,318 WARN [org.jboss.jbossweb] WARNING: Exception for /j2eeanvendelse/Calculate1.jsp
org.apache.jasper.JasperException: No output directory: String index out of range: -1
at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:536)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:176)
...

Any ideas ?

I've found a work-around:
In web.xml add a terminating "/" in the "url-pattern" tokens, e.g. <url-pattern>/errorpage.jsp/</url-pattern>

The problem is in JspServlet.java; loadJSP:
if( outURI.endsWith("/") )
outURI = outURI + jspUri.substring(1,jspUri.lastIndexOf("/")+1);
else
outURI = outURI + jspUri.substring(0,jspUri.lastIndexOf("/")+1);;
The jspUri.lastIndexOf() causes the exception!
I haven't gone further to find out why, and I don't know if the work-around is a good idea, - but it got me up and running!

/Per