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# Descriptor Validation Exceptions

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A descriptor exception is a development exception that is raised when insufficient information is provided to the descriptor. The message that is returned includes the name of the descriptor or mapping that caused the exception. If a mapping within the descriptor caused the error, then the name and parameters of the mapping are part of the returned message.

The internal exception, mapping and descriptor appear only if TopLink has enough information about the source of the problem to provide this information.

Refer to the Descriptor Exceptions (1 – 201) section in the TopLink Exception Reference chapter for detailed information on descriptor validation exceptions that may occur.