📅  最后修改于: 2020-11-16 06:17:11             🧑  作者: Mango
Java 5.0中引入了注释。具有注释的目的是在类中或在其源代码内的类的元数据中附加附加信息。在EJB 3.0中,注释用于描述EJB类中的配置元数据。通过这种方式,EJB 3.0消除了在配置XML文件中描述配置数据的需要。
EJB容器使用编译器工具通过读取那些注释来生成所需的工件,例如接口,部署描述符。以下是常用注释的列表。
Sr.no | Name | Description |
---|---|---|
1 |
javax.ejb.Stateless |
Specifies that a given EJB class is a stateless session bean. Attributes
|
2 |
javax.ejb.Stateful |
Specifies that a given EJB class is a stateful session bean. Attributes
|
3 |
javax.ejb.MessageDrivenBean |
Specifies that a given EJB class is a message driven bean. Attributes
|
4 |
javax.ejb.EJB |
Used to specify or inject a dependency as EJB instance into another EJB. Attributes
|
5 |
javax.ejb.Local |
Used to specify Local interface(s) of a session bean. This local interface states the business methods of the session bean (which can be stateless or stateful). This interface is used to expose the business methods to local clients, which are running in the same deployment/application as EJB. Attributes
|
6 |
javax.ejb.Remote |
Used to specify Remote interface(s) of a session bean. This remote interface states the business methods of the session bean (which can be stateless or stateful). This interface is used to expose the business methods to remote clients, which are running in different deployment/application as EJB. Attributes
|
7 |
javax.ejb.Activation ConfigProperty |
Used to specify properties required for a message driven bean. For example, end point, destination, message selector etc. This annotation is passed as a parameter to activationConfig attribute of javax.ejb.MessageDrivenBean annotation. Attributes
|
8 |
javax.ejb.PostActivate |
Used to specify callback method of EJB lifecycle. This method will be called when EJB container just activated/reactivated the bean instance. This interface is used to expose the business methods to local clients, which are running in same deployment/application as EJB. |