public class hibernatetestbean implements sessionbean ...{ 
    sessioncontext sessioncontext; 
    sessionfactory sf; 
    public void setsessioncontext(sessioncontext sessioncontext) ...{ 
        this.sessioncontext = sessioncontext; 
        try ...{ 
            initialcontext ctx = new initialcontext(); 
            sf=(sessionfactory) ctx.lookup("java:/hibernate/sessionfactory"); 
        } catch (namingexception ex) ...{ 
            ex.printstacktrace(); 
        } 
    } 
    public void tran()...{ 
        tran1(); 
        tran2(); 

    } 
    public void tran1() ...{ 
        session session=sf.getcurrentsession(); 
        message msg=new message(); 
        msg.setcreatetime(new date()); 
        msg.setdetail("trans1"); 
        session.save(msg); 
        system.out.println("session:"+session.hashcode()); 
        session.flush(); 
        session.close(); 
    } 
    public void tran2() ...{ 
      session session=sf.getcurrentsession(); 
      message msg=new message(); 
      msg.setcreatetime(new date()); 
      msg.setdetail("trans2"); 
      session.save(msg); 
       system.out.println("session:"+session.hashcode()); 
 //  throw new runtimeexception("wrong"); 
  } 
…… 
}