Packaging Exceptions
The majority of this chapter has been concerned with describing the different exception types and looking at how a transaction that is in progress is affected when an exception is thrown. That information by far is the most important for you to understand because knowing how the container expects you to throw and catch exceptions is the only way you can write correct programs that are resilient when faced with unexpected errors. This last section departs from that focus and looks at a simple deployment issue related to the exception classes you define.
As discussed in this chapter, you should always create your own exception classes so you can precisely report error conditions in the systems you build. When you do this, ...
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