[5] Nested exception logging

[Tim Funk]

When exceptions are nested multiple times inside of ServletExcpetions - 
occasionally the true root cause is not logged (to disk). This complaint 
occasionally appears on the user list. I think the problem is  due to 
StandardWrapperValve using commons-logging and commons-logging knows nothing 
about nested exceptions. (At least with respect to ServletException)

A fix could be this (which I don't like and would probably be -1'd by 
someone). So I have a few questions about the possible patch below:
- Is this correct - its *ugly* in its output but it seems to work
- Is this the only place to fix?
- Is there a better alternative?
- Or did I completely miss something?

-Tim

RCS file: 
/home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/core/StandardWrapperValve.java,v
retrieving revision 1.15
diff -u -b -r1.15 StandardWrapperValve.java
--- StandardWrapperValve.java   26 May 2003 22:03:59 -0000      1.15
+++ StandardWrapperValve.java   21 Jun 2003 17:38:15 -0000
@@ -286,6 +286,17 @@
             hreq.removeAttribute(Globals.JSP_FILE_ATTR);
             log.error(sm.getString("standardWrapper.serviceException",
                              wrapper.getName()), e);
+            Throwable rootCause = e.getRootCause();
+            while (rootCause!=null) {
+                log.error(sm.getString("standardWrapper.serviceException",
+                                 wrapper.getName()), rootCause);
+
+                if (rootCause instanceof ServletException)
+                    rootCause = ((ServletException) rootCause).getRootCause();
+                else
+                    rootCause = null;
+             }
+

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