CDI可以将标准库POJO注入EJB吗？

我可以将自己的POJO注入到这样的管理对象中：

I can inject my own POJO into a managed object like this:

import javax.ejb.Stateless;
import javax.inject.Inject;
@Stateless
public class SomeEjb {
    @Inject
    private SomePojo somePojo;
}

我有这个POJO：

// No annotations
public class SomePojo {   
}

这工作正常。如果我将EJB注入到JSF后台bean中，我可以看到 somePojo 的值是非空值，如预期的那样。

This works fine. If I inject the EJB into a JSF backing-bean, I can see that the value of somePojo is non-null value, as expected.

但是，如果我尝试将 java.util.Date 注入到 SomeEjb 中，我在部署时收到以下异常：

However, if I try to inject a java.util.Date into SomeEjb, I get the following exception on deployment:

Severe: Exception while loading the app : WELD-001408 Unsatisfied dependencies for type [Date] with qualifiers [@Default] at injection point [[field] @Inject private SomeEjb.date]
org.jboss.weld.exceptions.DeploymentException: WELD-001408 Unsatisfied dependencies for type [Date] with qualifiers [@Default] at injection point [[field] @Inject private SomeEjb.date]
    at org.jboss.weld.bootstrap.Validator.validateInjectionPoint(Validator.java:311)

SomeEjb now：

SomeEjb now:

// No annotations
public class SomeEjb {
    @Inject
    private Date date;    
}

Date有一个public，无参数的构造函数，我以为这是所有的CDI需要满足依赖。我确信这个行为是规范，但是我明白CDI的理解显然有一个很大的洞。

Date has a public, no-argument constructor, and I thought that's all CDI would need to "satisfy the dependency". I'm sure this behaviour is "to spec", but clearly there's a big hole in my understanding of CDI.

有人可以解释为什么这不行吗？来自CDI透视图的 SomePojo 和 java.util.Date 有什么区别？

Can someone explain why this doesn't work? What's the difference between SomePojo and java.util.Date from a CDI perspective?

上下文：

• Java EE 6


• GlassFish 3.1.2.2


• 我没有这个用例。我知道我可以指定 new Date（）。

• Java EE 6
• GlassFish 3.1.2.2
• I don't have a use-case for this. I know that I can just specify new Date().