Alternative of JTATransaction

I have an Spring based J2EE application which runs well on Weblogic, I wanted to move it to Tomcat.

It seems tomcat doesn't support JTA Transaction Manager without external jar help like Atomikos, JOTM, Bitronix, SimpleJTA.

I am reluctant to make changes into my application where i am already using annotation based JTA transaction manager.

Are there alternatives for JTA Transaction Manager which I can use so that I am able to switch from weblogic to tomcat or tomcat to weblogic or any other server without changing my configuration file each time?

All in all what's best for transaction manager configuration when you want to keep your application (war) independent of server(s).