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Are you pointing about the Transaction manager service  that is part of the application server.

You can look up  the the transaction manager service that is available in application server ( below code for  Jboss 4.0.).

While setting the environment

//Set the environment details

        Environment env = KnowledgeBaseFactory.newEnvironment();

        env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );

        env.set( EnvironmentName.TRANSACTION_MANAGER, getTransactionManager());

        env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );

I am looking up the transaction manager  and using it

getTransactionManager() {

  InitialContext ic = new InitialContext();

  TransactionManager    tm = (TransactionManager) ic.lookup("java:jboss/TransactionManager");

}

Cheers :)