What is a "Fatal" Exception?

[hyjshanghai]

In a chunk-based step, as far as I understand, any exception not explicitly categorized as <skippable-exception-classes/> or <retryable-exception-classes/> will cause the step to fail, which in turn causes the whole job to fail.

Then, what is the meaning of a fatal exception categorized as <fatal-exception-classes/>?. Will it also cause the step to fail and cause anything more than non-fatal ones?

[Dave Syer]

A fatal exception is neither retryable nor skippable (and always causes a failure of the step, including a rollback), so you are correct that there is some overlap. It's just easier to configure fatal exceptions explicitly sometimes, rather than trying to work out what is excluded from the other cases.