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# ValidationException Handler

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As part of your general error handling strategy, your application should be prepared to handle a `ValidationException` of type `ISOLATED_SESSION_IS_NO_LONGER_AVAILABLE`.

TopLink throws an `ISOLATED_SESSION_IS_NO_LONGER_AVAILABLE` when a client triggers the indirection on an isolated object when the isolated session used to load that object is no longer available, that is, after you call the isolated session method `release`.

Fore more information, see:

- "Exception Handlers"

- "Configuring an Exception Handler"