We will use this issue as the placeholder for error message related fixes going
in 9.1. Improving error message will be one of our top priorities for 9.1.
a. Examine error handling framework and make sure error is propagated back to
the user properly.
We will look at all deployment clients: jsr88 (netbeans), admin-gui,
admin-cli and autodeploy and make sure they report status back properly.
b. Improve the quality of error messages
i) users don't see stack trace
ii) for the most common use cases, improve error message to be more
diagnostic so it can help users to figure things out themselves.