@EJB从不同的罐子注入 [英] @EJB inject from different jar

问题描述

我正在尝试注入一个位于不同jar文件中的bean，然后我尝试注入它的bean。这两个bean都是基本的@Stateless bean，具有本地和远程接口。
如果我使用正常注入

  @EJB 
 IBean injectBean; 
  

或

  @EJB 
 IBeanLocal injectBean; 
  

部署应用程序时，我得到一个NullPointerException。

如果我使用：

  @EJB（mappedName =Bean）
 IBean injectBean; 
  

或

  @EJB（mappedName =Bean）
 IBeanLocal injectBean; 
  

一切正常，JBoss不会发生部署错误。

我可能会提到我使用JBoss 5。

我注入的bean类被声明为：

  @Remote 
 public interface IBean 
 
 @Local 
 public interface IBeanLocal扩展IBean 
 
 @Stateless name =Bean）
 public class Bean实现IBean，IBeanLocal 
  

我的问题是如文档中指定的mappedName属性是供应商特定的。有没有其他方式我可以让这个工作？

解决方案：

问题是我试图单独部署两个jar，这意味着每个jar都将在JBoss中获得它自己的ClassLoader，以便他们找不到并返回NullPointerException当尝试注入bean时。

解决方案是将jar添加到一个耳朵，并添加一个包含application.xml的META-INF，如下所示： p>

 < application xmlns =http://java.sun.com/xml/ns/j2ee
 xmlns： xsi =http://www.w3.org/2001/XMLSchema-instance
 xsi：schemaLocation =http://java.sun.com/xml/ns/j2ee 
 http：/ /java.sun.com/xml/ns/j2ee/application_1_4.xsd
 version =1.4> 
 
< display-name>应用程序的简单示例< / display-name> 
 
< module> 
< ejb> ejb1.jar< / ejb> 
< / module> 
< module> 
< ejb> ejb2.jar< / ejb> 
< / module> 
< / application> 
  

我还必须更改一些JNDI查找，以便通过添加耳机名称来匹配新结构这些类：ear-name / bean

此后，我只是将jar添加到耳朵，所有部署都很好。

解决方案

尝试用 @EJB（beanName =Bean）注入你的bean

不知道是否可以正常工作，但是我们也有类似的问题，这是由于缺少 beanName 属性导致的。

I'm trying to inject a bean located in a different jar file then the bean i'm trying to inject it into. Both beans are just basic @Stateless beans with local and remote interfaces. If i use the normal injection

@EJB
IBean injectedBean;

or

@EJB
IBeanLocal injectedBean;

i get a NullPointerException when deploying the application.

If i use:

@EJB(mappedName="Bean")
IBean injectedBean;

or

@EJB(mappedName="Bean")
IBeanLocal injectedBean;

everything works and JBoss throws no deployment errors.

I might mention i use JBoss 5.

The bean class i'm injecting is declared as:

@Remote
public interface IBean

@Local
public interface IBeanLocal extends IBean

@Stateless(name = "Bean")
public class Bean implements IBean, IBeanLocal

My problem is that as specified in the documentation the mappedName property is vendor-specific. Is there any other way i could get this to work?

SOLVED:

I managed to solve the problem.

The problem was that i tried to deploy both jars individually which meant that each would get it's own ClassLoader in JBoss so that they couldn't find each other and would return a NullPointerException when trying to inject the bean.

The sollution was to add the jars to an ear and add an META-INF containing an application.xml looking like this:

<application xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
         http://java.sun.com/xml/ns/j2ee/application_1_4.xsd"
         version="1.4">

  <display-name>Simple example of application</display-name>

  <module>
    <ejb>ejb1.jar</ejb>
  </module>
  <module>
    <ejb>ejb2.jar</ejb>
  </module>
</application>

I also had to change some JNDI lookups i made to match the new structure by adding the ear name before the classes: "ear-name/bean"

After this i just added the jars to the ear and everything deployed nicely.

解决方案

Try injecting your bean with @EJB(beanName = "Bean")

Not sure if it'll work, but we had a similar issue and it was caused by the lack of the beanName attribute.

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