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Why just marking and not rolling back?

 
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Hi.
setRollbackOnly() method in CMT beans informs the transaction manager that this transaction is marked to be rolled-back.
Why this marking thing? why not rollback immediately?
Thanks.
 
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A CMT bean marks a transaction for rollback to protect data integrity before throwing an application exception, because application exceptions do not automatically cause the EJB container to rollback the transaction.
 
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John,

CMT means container - managed
 
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