确切地讲,什么是“容器管理对象”? Java 6 EE世界中? [英] What is exactly "container managed object" in Java 6 EE world?
问题描述
我试图在Clasfish上运行的Struts动作中使用CDI。
但是java依赖注入不适用于它。它适用于JSF,但不适用于struts。
如我所读-容器将依赖项注入到任何容器管理的bean实例(由容器创建的bean)中。
I tried to use CDI for my struts action running on glassfish. But java dependency injection does not work for it. It works for JSF but not struts. As I read -- container injects dependencies to any instance of container managed bean (bean created by container).
因此,什么是容器管理的bean? ?有POJO吗?还是只有jsf back bean,ejb-bean等?
So, what is "container managed bean"? Any POJO? Or only jsf back bean, ejb-bean and so on?
它是如何发生的? Glassfish是否需要注入特殊的类加载器?
And how it happens? Glassfish has special class-loader to inject?
推荐答案
我只能将CDI bean注入托管类中。 Struts创建了自己的实例,因此Struts Bean没有容器管理。
I only can inject your CDI beans in managed classes. Struts creates its own instances, so Struts beans are no container managed.
我不知道Struts是否具有能够注入CDI bean的插件,但是您可以查找
I don't know if Struts has a plugin able to inject CDI beans, but you can lookup the Bean Manager in JNDI tree.
public BeanManager getBeanManager() {
try {
Context jndiContext = new InitialContext();
return (BeanManager) jndiContext.lookup("java:comp/BeanManager");
} catch (NamingException e) {
// handle the exception
}
}
在您的应用程序中,可以使用以下命令:
In your application you can use this:
BeanManager manager = BeanManagerUtil.getBeanManager();
manager.getBeans(MyClass.class);
对于getBeans方法返回的每个bean,您都需要获取bean引用
For each bean returned by getBeans method you need to get the bean reference
CreationalContext ctx = manager.createCreationalContext(bean);
MyClass myClass = manager.getReference(bean, MyClass.class, ctx);
问候
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