User Story

As an app developer / support engineer, I want to see an error stack trace when there is an error happening during calling an action handler, so that I can debug it or ask for help.

Acceptance Criteria

describe the final result from the owner's point of view to be counted as completed

Details

• In current fl, 10.0.0.FL.20230313, when there is an error happens, zk just show a dialog with the exception message which doesn't help locate the root cause
  
  Because there is no error stack trace at server side. Notice that an error could happen in any level of underlying system, or the error might be general. Without the error stack trace, it's hard to locate the root cause.
• see ErrorRichliet.java as a typical example