java - 获取无法解析引用本地 ejb-ref 未实现父接口(interface)

Question

我想弄清楚为什么我需要实现这两个接口(interface)以避免部署问题。

Java代码

ExamplePlanAssembler.java

@Local
public interface ExamplePlanAssembler {
   ExamplePlan toBO(ExamplePlanEntity entity);
}

ExtendedExamplePlanAssembler.java

@Local
public interface ExtendedExamplePlanAssembler 
extends ExamplePlanAssembler{
   ExtExamplePlan toBO(ExamplePlanEntity entity, ExtExamplePlanEntity extEntity);
}

ExtendedExamplePlanAssemblerImpl.java

@Stateless
public class ExtendedExamplePlanAssemblerImpl 
implements ExtendedExamplePlanAssembler {
   /* Method impls removed */
}

ExamplePlanServiceImpl.java

@Stateless
public class ExamplePlanServiceImpl 
implements ExamplePlanService {
   private ExamplePlanAssembler examplePlanAssembler ;
   @EJB
   public void setAssembler(ExamplePlanAssembler examplePlanAssembler) {
       this.examplePlanAssembler = examplePlanAssembler;
    }
}

部署错误

[#|.507-0500|SEVERE|gf3.1.2|javax.enterprise.system.tools.deployment.org.glassfish.deployment.common
|_ThreadID=83;_ThreadName=Thread-7;|Cannot resolve reference Local ejb-ref name=
com.myco.services.business.ExampleServiceImpl/examplePlanAssembler,Local 3.x interface =
com.myco.services.assembly.ExamplePlanAssembler,ejb-link=null,lookup=,mappedName=,jndi-name=,refType=Session|#]

[#|.508-0500|SEVERE|gf3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.server
|_ThreadID=83;_ThreadName=Thread-7;|Exception while deploying the app [mycoservicesear]|#]

[#|.508-0500|SEVERE|gf3.1.2|javax.enterprise.system.core.com.sun.enterprise.v3.server
|_ThreadID=83;_ThreadName=Thread-7;|Cannot resolve reference Local ejb-ref name=
com.myco.services.business.ExampleServiceImpl/examplePlanAssembler,Local 3.x interface =
com.myco.services.assembly.ExamplePlanAssembler,ejb-link=null,lookup=,mappedName=,jndi-name=,refType=Session
java.lang.RuntimeException: Cannot resolve reference Local ejb-ref name=
com.myco.services.business.ExampleServiceImpl/examplePlanAssembler,Local 3.x interface =
com.myco.services.assembly.ExamplePlanAssembler,ejb-link=null,lookup=,mappedName=,jndi-name=,refType=Session


[#|.516-0500|SEVERE|gf3.1.2|javax...gf.deployment.admin
|_ThreadID=83;_ThreadName=Thread-7;|Exception while deploying the app [mycoservicesear] : Cannot resolve reference Local ejb-ref name=
com.myco.services.business.ExampleServiceImpl/examplePlanAssembler,Local 3.x interface =
com.myco.services.assembly.ExamplePlanAssembler,ejb-link=null,lookup=,mappedName=,jndi-name=,refType=Session|#]

修复？!

如果我更改我的接口(interface) impl 以不仅实现 ExtendedExamplePlanAssembler 接口(interface)，而且还实现父级 ExamplePlanAssembler 接口(interface)，我的部署错误就会消失。

ExtendedExamplePlanAssemblerImpl.java (v2)

@Stateless
public class ExtendedExamplePlanAssemblerImpl 
implements ExtendedExamplePlanAssembler,  ExamplePlanAssembler{
   /* Method impls removed */
}

问题

为什么将父接口(interface)添加到我的implements 声明可以解决部署问题？

Answer 1

EJB 规范是这样说的，

例如，特定 session bean 公开的客户端 View 不会被子类继承也恰好定义了一个 session bean。

@Stateless
public class A implements Foo { ... }
@Stateless
public class B extends A implements Bar { ... }

假设 Foo 和 Bar 是本地业务接口(interface)并且没有关联的部署描述符，session bean A暴露本地业务接口(interface)Foo，session bean B暴露本地业务接口(interface)Bar，但不是 Foo。

引用 here . EJB3.1规范4.9.2.1节