Java Data Objects

Name

JDOUserException

Synopsis

This is the base class for user errors that can be retried. It is derived from JDOCanRetryException. Reasons for this exception include:

Instance is not of a persistent class

This exception is thrown when a method requires an instance of a persistent class and the instance passed to the method does not implement PersistenceCapable. This occurs if the class of the instance is not persistent and has not been enhanced. getFailedObject( ) returns the instance causing the exception.

Extent is not managed

This exception is thrown when you call getExtent( ) with a class that does not have a managed extent.

Object exists

For a class using application identity, the combined value of the primary key fields must be unique. This exception is thrown if the primary key fields are not unique. This can occur when a new instance, or an existing persistent instance that has had a primary key field changed, is flushed to the datastore. It might also be thrown during makePersistent( ) if an instance with the same primary key is already in the PersistenceManager cache. The failed Object has the failed instance.

Object is owned by another PersistenceManager

This exception is thrown if you call makePersistent( ), makeTransactional( ), makeTransient( ), evict( ), refresh( ), or getObjectId( ) when the instance is already persistent or transactional in a different PersistenceManager. The failed Object has the failed instance.

Nonunique identity is not valid after transaction completion ...