jakarta-ee - EJB 事务中的默认属性

Question

我正在阅读 java ee docs我想问几个问题，以确保我已经很好地理解了 EJB-Transactions 发生了什么。

1) 文档指出默认 TransactionManagement值为 CONTAINER和默认 TransactionAttribute值为 REQUIRED :如果是这样，我对以下( session )Bean 使用 CONTAINER 执行其所有方法是否正确？托管事务和属性 REQUIRED ?

@Stateless
public class MyBean{

public void methodA(){
...
}

public void methodB(){
...
}

}

2)文档状态: Container-managed transactions do not require all methods to be associated with transactions. When developing a bean, you can set the transaction attributes to specify which of the bean’s methods are associated with transactions.
但是，如果我省略了 TransactionAttributeType ，是不是自动设置为 REQUIRED ?是 methodB在以下 Bean 中与事务无关？

@Stateless
@TransactionManagement(CONTAINER)
public class MyBean{

@TransactionAttribute(MANDATORY)
public void methodA(){
...
}

public void methodB(){
...
}

}

Answer 1

是的，CONTAINER和 REQUIRED是默认值。

您给出的报价似乎来自 The Java EE 5 Tutorial .我同意这句话的措辞有些困惑。这是可能有帮助的可能重写。

Container-managed transactions do not require all methods to use the default REQUIRED transaction semantics. When developing a bean, you can change the transaction semantics by setting the transaction attributes. For example, you can specify that a method should run without any transaction by using the NEVER transaction attribute,