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This article will share with you about the key values of EJB transaction properties. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1 、 Required

If the client is running in an EJB transaction and a method in EJB is called, the method runs in the client's EJB transaction. If the client is not associated with an EJB transaction, the container starts a new EJB transaction before running the method. The Required property is suitable for most EJB transactions, and it is recommended that it be set to the default, at least during the development phase. EJB transaction properties are declarative and can be easily modified later.

2 、 RequiresNew

If the client is running in an EJB transaction and the method in EJB is called, the container will do the following:

(1) suspend client EJB transaction

(2) start a new EJB transaction

(3) delegate the call to the method

(4) after the method is executed, reply to the client EJB transaction

If the client is not associated with an EJB transaction, the container starts a new EJB transaction before running the method. If you ensure that the method always runs in a new EJB transaction, you should use the RequiresNew property in the EJB transaction property.

3 、 Mandatory

If the client is running in an EJB transaction and a method in EJB is called, the method runs in the client EJB transaction. If the client is not associated with an EJB transaction, the container throws a TransactionRequiredException. If the methods in EJB must use the client's EJB transaction, you should use the Mandatory attribute in the EJB transaction property.

4 、 NotSupported

If the client runs in an EJB transaction and calls a method in EJB, the container suspends the client-side EJB transaction and replies to the client-side EJB transaction after the method invocation ends. If the client is not associated with an EJB transaction, the container does not start the EJB transaction before running the method. For methods that do not require EJB transactions, you can consider this attribute. EJB transactions require some overhead, and the NotSupported attribute in the EJB transaction attribute can improve performance.

5 、 Supports

If the client is running in an EJB transaction and a method in EJB is called, the method runs in the client's EJB transaction. If the client is not associated with an EJB transaction, the container does not start a new EJB transaction before running the method.

6 、 Never

If the client is running in an EJB transaction and a method in EJB is called, the container throws a RemoteException exception. If the client is not associated with an EJB transaction, the container does not start a new EJB transaction before running the method.

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