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Doubt from ejbcerticate mock exam

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One of the answers explanation says " A transaction is not rolled backed by the container as a result of a system exception thrown when the transaction runs with an unspecified transaction context and also when a bean is declared with bean-managed transaction demaraction. "

Now, in HF book (page 534), it's written that container will always roll back the exception once a system exception is thrown. It doesn't say any thing about whether it is BMT/CMT. Which is correct - HF or ejbCertificate exam?

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Be it BMT or CMT, the container always rolls back a started transaction if the bean instance throws a System Exception. The container destroys the instance when a system exception is thrown. There is no point in keeping the transaction open when the instance that started it no longer exists. Makes sense?
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