9.1. JDO exception hierarchy
Exceptions arising through JDO fall into a number of categories. Exceptions may be fatal (the requested operation cannot be completed) or can be retried (the error can be corrected by the application and the operation attempted again). They may be caused by the application (user), by the data store, or by the JDO implementation itself. The exception hierarchy defines base classes to handle each of these situations (Figure 9.1).
Figure 9.1. JDO exception hierarchy
When examining the hierarchy, note the following terminology that refers to the source of each exception:
User: the application/component invoking JDO persistence ...
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