Checkfree transaction managed in specified layer:   In a dedicated  class, say TransactionAdapter,  it encapsulated the transaction handling over com.checkfree.isolutions.persist.PersistServer   1. begainTransaction:  PersistServer.activate() -> PersistServer.beginTransaction() 2. commitTransaction: PersistServer.commitTransaction() -> PersistServer.deactivate() 3. rollbackTransaction: PersistServer.rollbackTransaction() -> PersistServer.deactivate() try{                    txnStarted = TransactionAdapter.beginTransaction();                  //    boolean flag = checkfree invocation }finally{                  if(flag == "success" )                           TransactionAdapter.commitTransaction(txnStarted);                 else                             TransactionAdapter.rollbackTransaction(txnStarted);   }