java Glassfish 上 EAR 文件中 EJB3 的 JNDI 查找
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JNDI lookup of EJB3 inside an EAR file on Glassfish
提问by Zecrates
I have an EAR file with a bunch of JARs in it, and one of these JARs contains Local Session Beans (EJB3). I need to perform a JNDI lookup of these Session Beans from within an unmanaged POJO, also contained in the EAR (and in this case in the same JAR as the EJBs as well). I tried following the Glassfish EJB FAQ, but I keep on receiving a javax.naming.NameNotFoundException no matter what I try.
我有一个包含一堆 JAR 的 EAR 文件，其中一个 JAR 包含本地会话 Bean (EJB3)。我需要从非托管 POJO 中对这些会话 Bean 执行 JNDI 查找，该 POJO 也包含在 EAR 中（在本例中，也包含在与 EJB 相同的 JAR 中）。我尝试遵循Glassfish EJB FAQ，但无论我尝试什么，我都会收到 javax.naming.NameNotFoundException 。
I am unsure of a few things. Where should I put my ejb-jar.xml (I tried the EARs META-INF as well as the JARs META-INF)? Do I need a sun-ejb-jar.xml? What exactly is ejb-link, what does it do? What could I be doing wrong (my configuration is almost identical to the one given in the FAQ for local lookups)?
我不确定一些事情。我应该把 ejb-jar.xml 放在哪里（我尝试了 EAR META-INF 和 JAR META-INF）？我需要一个 sun-ejb-jar.xml 吗？ejb-link 到底是什么，它有什么作用？我可能做错了什么（我的配置与本地查找常见问题解答中给出的配置几乎相同）？
I list some of the configuration I tried and the result below:
我列出了一些我尝试过的配置，结果如下：
<enterprise-beans>
<session>
<ejb-name>ITestBean</ejb-name>
<ejb-class>com.test.TestBean</ejb-class>
<ejb-local-ref>
<ejb-ref-name>ITestBean</ejb-ref-name>
<local>com.test.ITestBean</local>
</ejb-local-ref>
</session>
</enterprise-beans>
Application deploys but JNDI lookup returns null.
应用程序部署但 JNDI 查找返回 null。
<enterprise-beans>
<session>
<ejb-name>ITestBean</ejb-name>
<ejb-class>com.test.TestBean</ejb-class>
<ejb-local-ref>
<ejb-ref-name>ITestBean</ejb-ref-name>
<local>com.test.ITestBean</local>
<ejb-link>ITestBean</ejb-link>
</ejb-local-ref>
</session>
</enterprise-beans>
Application doesn't deploy: Unable to determine local business vs. remote business designation for EJB 3.0 ref Unresolved Ejb-Ref ITestBean@jndi.
应用程序未部署：无法确定 EJB 3.0 ref Unresolved Ejb-Ref ITestBean@jndi 的本地业务与远程业务指定。
<enterprise-beans>
<session>
<ejb-name>ITestBean</ejb-name>
<ejb-class>com.test.TestBean</ejb-class>
<ejb-local-ref>
<ejb-ref-name>ITestBean</ejb-ref-name>
<local>com.test.ITestBean</local>
<ejb-link>MyJar.jar#ITestBean</ejb-link>
</ejb-local-ref>
</session>
</enterprise-beans>
Application doesn't deploy: Error: Unresolved : MyJar.jar#ITestBean.
应用程序未部署：错误：未解决：MyJar.jar#ITestBean。
<enterprise-beans>
<session>
<ejb-name>ITestBean</ejb-name>
<local>com.test.ITestBean</local>
<ejb-local-ref>
<ejb-ref-name>ITestBean</ejb-ref-name>
</ejb-local-ref>
</session>
</enterprise-beans>
Error processing EjbDescriptor
错误处理 EjbDescriptor
采纳答案by Zecrates
It isn't possible to perform a JNDI lookup of a bean from a POJO, unless that POJO is called (directly or indirectly) from a managed class (such as a session bean). In other words, the first example won't work while the second one will (assuming MyPOJO is the class that tries to perform a JNDI lookup):
不可能从 POJO 执行 bean 的 JNDI 查找，除非从托管类（例如会话 bean）调用（直接或间接）该 POJO。换句话说，第一个示例将不起作用，而第二个示例将起作用（假设 MyPOJO 是尝试执行 JNDI 查找的类）：
1) UnmanagedClass1 -> UnmanagedClass2 -> UnmanagedClass3 -> MyPOJO
2) ManagedClass -> UnmanagedClass2 -> UnmanagedClass3 -> MyPOJO
1) UnmanagedClass1 -> UnmanagedClass2 -> UnmanagedClass3 -> MyPOJO
2) ManagedClass -> UnmanagedClass2 -> UnmanagedClass3 -> MyPOJO
回答by elhoim
You can always also dump on System.out or in a log all the names in the InitialContext.
您也可以随时将 InitialContext 中的所有名称转储到 System.out 或日志中。
//Get all the names in the initial context
NamingEnumeration children = initialContext.list("");
while(children.hasMore()) {
NameClassPair ncPair = (NameClassPair)children.next();
System.out.print(ncPair.getName() + " (type ");
System.out.println(ncPair.getClassName() + ")");
}
}
回答by jsight
ejb-jar.xml for your ejb file goes into META-INF (of the EJB-Jar, not of the ear). EJB Refs in the deployment descriptor look something like this:
ejb 文件的 ejb-jar.xml 进入 META-INF（EJB-Jar，而不是耳朵）。部署描述符中的 EJB Refs 如下所示：
<ejb-local-ref>
<ejb-ref-name>EJBName</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local>classname</local>
<ejb-link>JARName.jar#EJBName</ejb-link>
</ejb-local-ref>
The lookup code looks something like:
查找代码类似于：
Context c = new InitialContext();
return (EJBLocalInterface) c.lookup("java:comp/env/EJBName");
I don't believe that you will need a container specific deployment descriptor (sun-ejb-jar.xml) for this type of lookup.
我不相信您将需要一个容器特定的部署描述符 (sun-ejb-jar.xml) 来进行此类查找。
回答by elhoim
I think the EJB 3 Portability Issueblog post should help you.
我认为EJB 3 Portability Issue博客文章应该对您有所帮助。
回答by velabhai
I have working on glassfish v2 and when calling JSNI from EJB3 I need only ejb-jar.xml, not sun-ejb-jar.xml
我正在研究 glassfish v2，当从 EJB3 调用 JSNI 时，我只需要 ejb-jar.xml，而不是 sun-ejb-jar.xml
<ejb-jar xmlns = "http://java.sun.com/xml/ns/javaee"
version = "3.0"
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd">
<enterprise-beans>
<session>
<ejb-name>TestBean1</ejb-name>
<ejb-local-ref>
<ejb-ref-name>ejb/TestLocal</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local>com.clients.TestLocal</local>
<mapped-name>ejb/TestLocal</mapped-name>
</ejb-local-ref>
<ejb-local-ref>
<ejb-ref-name>ejb/Test2Local</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local>com.clients.Test2Local</local>
<mapped-name>ejb/Test2Local</mapped-name>
</ejb-local-ref>
<session>
<enterprise-beans>
@Stateless(mappedName="ejb/TestLocal")
public class TestBean1 implements TestLocal
@Stateless(mappedName="ejb/Test2Local")
public class TestBean2 implements Test2Local
Calling the service locator inside TestBean1 as
将 TestBean1 中的服务定位器调用为
ic.lookup("java:comp/env/ejb/Test2Local");
will return Test2Bean
将返回 Test2Bean
