java 本地和远程无状态 bean 的 jndi 绑定

jndi binding for local and remote stateless bean

提问by R Vive L OL

I'm trying to implements an EJB3 stateless with a remote and local interfaces the problem is the local one is called in an other remote EJB with the annotation @EJBbut it returns null or ClassCastException(java.lang.ClassCastException: com.sun.proxy.$Proxy58 cannot be cast).

我正在尝试使用远程和本地接口实现 EJB3 无状态，问题是在其他远程 EJB 中使用注释调用本地接口，@EJB但它返回 null 或ClassCastException( java.lang.ClassCastException: com.sun.proxy.$Proxy58 cannot be cast)。

To perform the lookup on the server to get the local stateless I have to put 2 JNDI names for the stateless else it gives me the remote one.

要在服务器上执行查找以获得本地无状态，我必须为无状态放置 2 个 JNDI 名称，否则它会给我远程名称。

@Stateless(mappedName=IRemoteInterface.JNDI_NAME, description="...")
@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
@Interceptors({GenericInvocationHandler.class})
@Remote(IRemoteInterface.class)
@Local(ILocalInterface.class)
public class MystatelessBean extends AbstractBasicBean implements 
    IRemoteInterface, ILocalInterface {
   ...
}

@Stateless(mappedName=IRouting.JNDI_NAME, description="gives access to other services")
@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
@Interceptors({GenericInvocationHandler.class})
@Remote(IRouting.class)
public class RoutingServiceBean extends AbstractBasicBean implements IRouting {

    @EJB
    public ILocalInterface iLocalInterface;

}

Actually, when I use @EJBI get NPEand when I use @EJB(beanName=IRemoteInterface.JNDI_NAME)I get ClassCastExceptionwhich is right JNDI name of the remote interface.

实际上，当我使用时@EJB我得到NPE，当我使用时@EJB(beanName=IRemoteInterface.JNDI_NAME)我得到ClassCastException远程接口的正确 JNDI 名称。

I m looking for something like @LocalBindingand @RemoteBindingin JBoss.

我在 JBoss 中寻找类似@LocalBinding和的东西@RemoteBinding。

Maybe I'm missing something?

也许我错过了什么？

回答by Simon Zambrovski

1. If you use EJB3.0 you may use @Localbinding/ @Remotebindingin JBoss. If you use EJB 3.1, the JNDI bindings are standardized (called portable global JNDI name).

2. nameattribute of the @Stateless/@Statefulannotation defines the name of the bean. It's default is the unqualified class name.

3. mappedNameattribute of the @Stateless/@Statefulannotation is used to map the bean to a JNDI name. If you provide this attribute, you need to provide the mappedNameattribute of the @EJBannotation in order to reference the bean. In terms of mapping:

   @Stateless(name="Bar")       => @EJB(beanName="Bar")
   @Stateless(mappedName="Foo") => @EJB(mappedName="Foo")
   

1. 如果您使用 EJB3.0，您可以在 JBoss 中使用@Localbinding/ @Remotebinding。如果您使用 EJB 3.1，则 JNDI 绑定是标准化的（称为可移植全局 JNDI 名称）。

2. name@Stateless/@Stateful注释的属性定义了 bean 的名称。它的默认值是不合格的类名。

3. mappedName@Stateless/@Stateful注释的属性用于将 bean 映射到 JNDI 名称。如果提供此属性，则需要提供注解的mappedName属性@EJB才能引用bean。在映射方面：

   @Stateless(name="Bar")       => @EJB(beanName="Bar")
   @Stateless(mappedName="Foo") => @EJB(mappedName="Foo")
   

In your example, try to use:

在您的示例中，尝试使用：

public class RoutingServiceBean {
    ...
    @EJB(mappedName=IRemoteInterface.JNDI_NAME)
    public ILocalInterface iLocalInterface;
}

回答by Peter Tarlos

If you're using JBOSS, you can specifiy the JNDI name of both the Local and Remote interfaces with annotations.

如果您使用 JBOSS，您可以使用注释指定本地和远程接口的 JNDI 名称。

@Stateless(mappedName=IRemoteInterface.JNDI_NAME, description="...")
@LocalBinding(jndiBinding = ILocalInterface.JNDI_NAME)
@Local(ILocalInterface.class)
@Remote(IRemoteInterface.class)
public class MystatelessBean extends AbstractBasicBean implements IRemoteInterface, ILocalInterface{
...
}

OR

或者

@Stateless()
@LocalBinding(jndiBinding = ILocalInterface.JNDI_NAME)
@RemoteBinding(jndiBinding = IRemoteInterface.JNDI_NAME)
@Local(ILocalInterface.class)
@Remote(IRemoteInterface.class)
public class MystatelessBean extends AbstractBasicBean implements IRemoteInterface, ILocalInterface{
...
}

Note that the remote JNDI name can be defined with either the Stateless or RemoteBinding annotation. The RemoteBinding and LocalBinding annotations are JBOSS specific and can be found in jboss-ejb3-ext-api.jar.

请注意，远程 JNDI 名称可以使用无状态或远程绑定注释来定义。RemoteBinding 和 LocalBinding 注释是 JBOSS 特定的，可以在 jboss-ejb3-ext-api.jar 中找到。