在Weblogic 10.3中调用EJB时​​出现NameNotFoundException [英] NameNotFoundException when calling a EJB in Weblogic 10.3

问题描述

我有一个这样定义的EJB:

I have a EJB defined as this:

package com.foo;
@Stateless (mappedName="HelloWorld")
public class HelloWorldBean implements HelloWorld, HelloWorldLocal
....

当部署到Weblogic(WL)时，它将获得名称myBean.我不确定这是否重要.

When it's deployed to Weblogic (WL), it gets the name myBean. I'm not sure if this is important.

我尝试使用以下代码调用Bean:

I try to call the bean with this code:

Hashtable ht = new Hashtable();
ht.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
ht.put(Context.PROVIDER_URL, "t3://localhost:7001");
ic = new InitialContext(ht);
tp = (HelloWorld) ic.lookup("HelloWorld#com.foo.HelloWorldBean");

有人知道为什么会出现以下错误吗?

Anyone know why I get the following error?

javax.naming.NameNotFoundException: While trying to lookup 'HelloWorld#com.foo.HelloWorldBean' didn't find subcontext 'HelloWorld#com'.
 Resolved '' [Root exception is javax.naming.NameNotFoundException: While trying
 to lookup 'HelloWorld#com.foo.HelloWorldBean' didn't find
 subcontext 'HelloWorld#com'. Resolved '']; remaining name 'HelloWorld#com/foo/HelloWorldBean'

推荐答案

要查找具有多个远程业务接口(例如，com.acme.FooBusiness1，com.acme.FooBusiness2)的会话Bean的远程接口，您需要查找派生自其的名称目标ejb的全局JNDI名称(@Stateless中的mappedName())和特定的远程业务接口的组合，以#"分隔:

To lookup a Remote Interface of a Session Bean with multiple Remote Business interfaces (e.g.com.acme.FooBusiness1, com.acme.FooBusiness2), you need to lookup a name derived from the combination of the target ejb's global JNDI name (the mappedName() in @Stateless) and the specific Remote Business Interface, separated by a "#":

InitialContext ic = new InitialContext();
FooBusiness1 bean1 = (FooBusiness1) ic.lookup("FooEJB#com.acme.FooBusiness1");
FooBusiness2 bean2 = (FooBusiness2) ic.lookup("FooEJB#com.acme.FooBusiness2");

在bean仅具有一个远程业务接口的典型情况下，不需要这种完全限定的格式.在这种情况下，可以直接使用Bean的JNDI名称:

In the typical case of a bean only having one Remote Business Interface, this fully-qualified form is not needed. In that case, the bean's JNDI name can be used directly :

FooBusiness bean = (FooBusiness) ic.lookup("FooEJB");

---

那是理论部分.现在练习.就您而言，从我所看到的情况来看，您正在从Weblogic访问EJB，所以我宁愿使用no-arg InitialContext()构造函数(并在其他环境中使用jndi.properties配置文件)，但这只是一个方面笔记.然后，您应该查找com.foo.HelloWorld(远程接口)，而不是com.foo.HelloWorldBean实施:

---

That was the theoretical part. Now the practice. In your case, from what I can see, you are accessing the EJB from Weblogic so I'd rather use the no-arg InitialContext() constructor (and use a jndi.properties configuration file for other environments) but this is just a side note. Then, you should look up com.foo.HelloWorld, the Remote Interface, not com.foo.HelloWorldBean, the implementation:

InitialContext ic = new InitialContext();
(HelloWorld) ic.lookup("HelloWorld#com.foo.HelloWorld");

如果您的bean只有一个远程业务接口，则应该可以使用:

And if your bean has only one Remote Business Interface, this should work:

(HelloWorld) ic.lookup("HelloWorld");

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