Java casting an exception (not class cast exception)

Question

When an exception is caught in java is there a use case for casting the exception to a new type? Or is the standard

    throw new DiffException(e)

The only way to do it. I apologize if I'm overlooking something but the only search results I get are for "ClassCastExceptions" Which is obviously not what I'm looking for

Answer 1

I believe you meant 'exception wrapping'. There's no other way to do it - you create a new instance of Exception using a constructor which takes another exception as cause. This works thanks to 1-arg constructor of java.lang.Exception. The typical implementation of custom exception type (like your DiffException) declares such 1-arg constructor too.