Atomikos transaction using two database
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I have tested Atomikos JTA using single database transaction and works great. But I don't see any examples for transactions across two database. Note: I am using Atomikos standalone API (i.e. not with Spring / Hibernate or other framework). 

What I want is write a single transaction that insert/update/commit into two seperate database (Oracle-Oracle for my testing). It performs commit if both are successful or rollback if any exception. 

I am looking for any configuration that is required OR sample code for such example. 

Really appreciate any pointers. Thanks!  