package jtajts;import javax.ejb.*;import javax.transaction.*;import javax.naming.*;public class JtaBean implements SessionBean {  SessionContext sessionContext;  public void ejbCreate() throws CreateException {  }  public void ejbRemove() {  }  public void ejbActivate() {  }  public void ejbPassivate() {  }  public void setSessionContext(SessionContext sessionContext) {    this.sessionContext = sessionContext;  }  //一個事務處理示例函數，這里只是實例  public String myTransation() {    UserTransaction userTran = sessionContext.getUserTransaction();    String ret="myTransation is start\n";    try{      userTran.begin();      ret=ret+"The first business is begin:\n";      //這里放第一個業務方法first business method()      ret=ret+"The first business is done:\n";      ret=ret+"The second business is begin:\n";      //這里放第二個業務方法second business method()       ret=ret+"The second business is done:\n";      userTran.commit();      ret=ret+"myTransation is over!\n";    }catch(Exception e){      try{      userTran.rollback();      }catch(SystemException sysex){        throw new EJBException( "Rollback失敗："+sysex.toString());      }    }    return ret;  }}