Solved, and my (obvious) error.... The task worker was being invoked with the (default it seems) POST method, but I had only implemented GET.
The Dashboard log showed the servlet being invoked with no error and no output, but in fact it was trying to do the POST with no post doPost() method implemented. Although an obvious error on my part, maybe some error logging on the Dashboard for dummies like me in this case might be a good idea - when the required method needed to invoke doesn't exist. BTW: As expected the Log output does appear correctly. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.