[keycloak-dev] JTA issues

[Bill Burke]

I hooked in JTA on my branch.  When KeycloakSessionFactory.create() is 
executed this happens:

* the code will check the JTA TransactionManager to see if a transaction 
is currently active

* If there is an active transaction, it is suspended 
(TransactionManager.suspend()).  A new one is created and associated 
with the thread TransactionManager.begin()

* A wrapper for the JTA transaction is created and registered with the 
KeycloakTransactionManager

* At transaction completion if there was a suspended JTA transaction it 
is resumed.

There are some issues with this though.  You have to modify the 
KeycloakDS <datasource> declaration and put in a flag jta="false".  If 
you don't do this then you get errors at boot time with Liquibase.  So, 
that change to KeycloakDS is the actual issue here.  Migrating apps will 
have to set the jta flag before they will be able to run with the latest 
keycloak version.  We may be able to specify a warning at boot time.

Bill