无状态EJB实现了接口注入失败 [英] Stateless EJB implements interface injection failed

问题描述

Wildfly 8.2.0

我有一个无状态 EJB和界面。

  @Local 
 @Stateless 
 public class Bean implements IBean {
 ... 
} 
 
 @Local 
 public interface IBean {
 ... 
} 
  

但是我收到一个WELD错误。如果Bean没有实现该接口，则没有错误。根据 https://stackoverflow.com/a/13988450/2023524
和 https://blogs.oracle.com/arungupta/entry/what_s_new_in_ejb 应该没有错误。

错误：

  WELD-001408：不符合类型Bean的依赖关系，默认
在注入点[BackedAnnotatedField] @Inject私人mypackage.anotherBean.bean 
  

更新：
我尝试了所有可能的组合与本地，但它没有帮助。只有当界面被删除时，没有错误。

  @Stateless 
 public class Bean implements IBean {
 ... 
} 
 
 @Local 
 public interface IBean {
 ... 
} 
 
 // ************ ***************** 
 @Stateless 
 public class Bean implements IBean {
 ... 
} 
 
 public interface IBean {
 ... 
} 
 // ************************* *********** 
 @Local 
 @Stateless 
 public class Bean implements IBean {
 ... 
} 
 
 public interface IBean {
 ... 
} 
  

解决方案

当您想使用EJB注入一个bean（使用 @EJB ）或CDI（使用 @Inject ）容器声明一个带有接口类型的变量。在应用程序部署期间，由容器找到声明接口的具体实现。在你的例子中，问题不在于注释，而是注入声明的类型（ Bean 而不是 IBean ）。 / p>


Wildfly 8.2.0

I have a Stateless EJB and an interface.

@Local
@Stateless
public class Bean implements IBean{
...
}

@Local
public interface IBean {
...
}

But I get a WELD Error. If Bean doesn't implement the interface there is no errors. According to https://stackoverflow.com/a/13988450/2023524 and https://blogs.oracle.com/arungupta/entry/what_s_new_in_ejb there should be no error.

Error:

WELD-001408: Unsatisfied dependencies for type Bean with qualifiers @Default
  at injection point [BackedAnnotatedField] @Inject private mypackage.anotherBean.bean

Update: I've tried all possible combinations with Local but it doesn't help. Only if interface is removed there is no error.

@Stateless
public class Bean implements IBean{
...
}

@Local
public interface IBean {
...
}

//*****************************
@Stateless
public class Bean implements IBean{
...
}

public interface IBean {
...
}
//************************************
@Local
@Stateless
public class Bean implements IBean{
...
}

public interface IBean {
...
}

解决方案

When you want to inject a bean whether by EJB (using @EJB) or CDI (using @Inject) container you declare a variable with interface type. Concrete implementation of declared interface is found by a container during application deployment. In your example the problem is not with annotations but with a declared type being injected (Bean instead of IBean).

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