@isunjin I also like the general idea, but not so much the current 
implementation. One disadvantage I see with the annotation is that they are not 
propagated in inheritance hierarchies and you always need to remember adding 
them in such a case. I also wonder where and how this classifier will be 
invoked later. Maybe an alternative approach could be to have a fixed set of 
`TaskException`s for the cases, and before leaving the TM, all exceptions are 
wrapped as cause into their matching `TaskException`  to classify them for the 
JM's recovery approach. However, the "best" approach might also depend on the 
intended use, which is not clear for me from the PR and that is why I am asking.

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