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Documentation for eclipselink.transaction.join-existing property? [message #1748783]

Mon, 28 November 2016 15:23

Christian Asselmeyer

Messages: 1
Registered: November 2016

Junior Member

Could somebody provide a more in-depth description on the function of the eclipselink.transaction.join-existing property? The documentation says that it is used to "force the persistence context to read through the JTA-managed ("write") connection in case there is an active transaction". The property's usage description then states that "objects read during transaction will not be placed into the shared cache unless they have been updated" if the proerty is set to true.

That leaves me a little at loss as those descriptions seem a bit unrelated to me. Can somebody elaborate on the property's function and when to use it?

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Re: Documentation for eclipselink.transaction.join-existing property? [message #1749101 is a reply to message #1748783]

Thu, 01 December 2016 19:42

Chris Delahunt

Messages: 1342
Registered: July 2009

Senior Member

Use it when you have an active JTA transaction that the EntityManager is not appart of but you want it to join. For instance, you obtain an extended EM and later on start a JTA transaction, and now want the EM to participate in this transaction.

The docs are correct in they are describing that reads will then all go through this transaction, and only get merged into the shared cache when the transaction completes.

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