public static TransactionManager getTransactionManager(Properties props) throws HibernateException 
{
		log.info( "obtaining TransactionManager" );
		return getTransactionManagerLookup( props ).getTransactionManager( props );
}

Convenience method for locating the JTA TransactionManager from the given platform config.

Same as calling #getTransactionManager .getTransactionManager( props )

 public static TransactionManagerLookup getTransactionManagerLookup(Properties props) throws HibernateException 
{
		String tmLookupClass = props.getProperty( Environment.TRANSACTION_MANAGER_STRATEGY );
		if ( tmLookupClass == null ) {
			log.info( "No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)" );
			return null;
		}
		else {
			log.info( "instantiating TransactionManagerLookup: " + tmLookupClass );
			try {
				TransactionManagerLookup lookup = ( TransactionManagerLookup )
						ReflectHelper.classForName( tmLookupClass ).newInstance();
				log.info( "instantiated TransactionManagerLookup" );
				return lookup;
			}
			catch ( Exception e ) {
				log.error( "Could not instantiate TransactionManagerLookup", e );
				throw new HibernateException( "Could not instantiate TransactionManagerLookup '" + tmLookupClass + "'" );
			}
		}
}

Generate the appropriate TransactionManagerLookup given the config settings being passed.