异步ejb方法调用中的事务传播 [英] Transaction propagation in asynchronous ejb method call

问题描述

我们有两个EJB会话bean，如下所示：

We have two EJB session beans as given below;

@Stateless
public class MyStatelessSessionBean{
      @EJB
       MyStatefulSessionBean statefulBean;
      public void methodA(){
          statefulBea.methodB();
      }
}

@Stateful
@ TransactionAttribute(TransactionAttributeType.REQUIRED)
public class MyStatefulSessionBean {
     @Asynchronous
     public void methodB(){
     }

}

（不在任何事务中）调用MyStatelessSessionBean的methodA。所有处理完成后，集装箱将开始多少次交易？

A client, which is not in any in any transaction, invoke methodA of MyStatelessSessionBean. How many distict transactions will be started by container after all processing has completed ?

推荐答案

开始有2笔交易。由于EJB 3.1规范在4.5.3节中说明：

There will be 2 transactions started. As EJB 3.1 specification states in point 4.5.3:

客户端事务上下文不会通过异步方法调用传播。从Bean开发者的角度来看，客户端从来没有一个事务上下文流入。这意味着，例如，异步方法上REQUIRED事务属性的语义与REQUIRES_NEW完全相同。

Client transaction context does not propagate with an asynchronous method invocation. From the Bean Developer’s view, there is never a transaction context flowing in from the client. This means, for example, that the semantics of the REQUIRED transaction attribute on an asynchronous method are exactly the same as REQUIRES_NEW.

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