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3.5. Transaction association

A transaction is associated with a transactional resource via the start method and disassociated from the resource via the end method. The resource adapter internally maintains an association between the resource connection object and the XAResource object. At any given time, a connection is associated with zero or one transaction. JTA does not support nestedtransactions, so attempting to invoke the start method on a thread that is already associated with a transaction is an error.
The transaction manager can Interleave multiple transaction contexts using the same resource, as long as methods start and end are invoked properly for each transaction context switch. Each time the resource is used with a different transaction, the method end must be invoked for the previous transaction that was associated with the resource, and method start must be invoked for the current transaction context.