title: In grails how can I let the transactionManager is mongoTransactionManager?
body: <p>I use grails 2.0.1, and uninstall-plugin hibernate, install-plugin mongodb.
  Now there is no bean named transactionManager, and there is a mongoTransactionManager.
  So my question is how can I define the transactionManager in my resources.groovy?
  Thanks a lot.</p>