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# TopLink Exception Reference

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This chapter lists the TopLink exception error codes, information about the likely cause of the problem and a possible corrective action. Each exception code corresponds to an exception class and includes the following information:

- The exception number in the format, `EXCEPTION [TOPLINK-``XXXX``]`

- A description of the problem, taken from the raised exception

This chapter contains information on the following exceptions:

- Descriptor Exceptions (1 – 201)

- Concurrency Exceptions (2001 – 2009)

- Conversion Exceptions (3001– 3008)

- Database Exceptions (4002 – 4018)

- Optimistic Lock Exceptions (5001 – 5009)

- Query Exceptions (6001 – 6129)

- Validation Exceptions (7001 – 7200),

- EJB QL Exceptions (8001 – 8010)

- Session Loader Exceptions (9000 - 9010)

- Communication Exceptions (12000 - 12003)

- EIS Exceptions (17007 – 17025), 90000, 91000

- JMS Processing Exceptions (18001 - 18004)

- Default Mapping Exceptions (20001 - 20008)

- Discovery Exceptions (22001 - 22004)

- Remote Command Manager Exceptions (22101 - 22111)

- Transaction Exceptions (23001 - 23015)

- XML Marshal Exceptions (25001 – 25020)

- XML Conversion Exceptions (25501)

- Migration Utility Exceptions (26001 - 26020)

- XML Platform Exceptions (27001 – 27006, 27101 – 27103, 27201 – 27202)

- Entity Manager Setup Exceptions (28001 – 28007)

- EJB JAR XML Exceptions (72000 – 72023)