客户端对EJB错误的调用：javax.naming.NoInitialContextException [英] Client call to EJB error: javax.naming.NoInitialContextException

问题描述

从类Main调用我的EJB：

  MyService myService =（MyService）ctx.lookup（MyService.class.getName（ ））; 
  

出现错误：

  javax.naming.NoInitialContextException：需要在环境或系统属性中或作为applet参数或在应用程序资源文件中指定类名称：javax.java中的java.naming.factory.initial 
。 naming.spi.NamingManager.getInitialContext（NamingManager.java:662）
在javax.naming.InitialContext.getDefaultInitCtx（InitialContext.java:313）
在javax.naming.InitialContext.getURLOrDefaultInitCtx（InitialContext.java： 350）javax.naming.InitialContext.lookup（InitialContext.java:417）
 com.ejb.calculator.Main.main（Main.java:26）
  

如何调用我的EJB？

尝试了两个不同的JNDI调用：

  JNDI_NAME = java：global / ejb / MyService; 
 MyService myService =（MyService）ctx.lookup（JNDI_NAME）; 
  

和

  MyService myService =（MyService）ctx.lookup（MyService.class.getName（））; 
  

代码：

注意：

我的测试用例适用于嵌入式容器，但是我可以不会调用我的外部运行容器。

使用的版本是Java8，EJB3.0，Glassfish5.0.1，Java EE8.0.1

Update1：​​
在deplyoment container-deploy-log.txt期间添加了日志。见git remote。

Update2：
将工作更改推送到git remote。

Update3：
将MDB示例推送到git remote。

解决方案

首先，如果要从外部客户端访问EJB，则需要声明一个远程视图。

由于您的EJB仅具有 @Local 批注，它仅提供本地视图。您应该添加 @Remote 批注。

  @Local 
 @Remote 
 @Stateless 
公共类MyService实现IMyService {
 public String getMessage（）{
 return Hello！; 
} 
} 
  

全局JNDI名称由以下形式组成：

  java：global / [EAR模块] / [EJB模块] / [EJB名称] 
  

在您的情况下，因为没有EAR，将是：

  java：global / ejb-1.0-SNAPSHOT / MyService 
  

此测试应该有效：

  Context ctx = new InitialContext（）; 
 IMyService myService =（IMyService）ctx.lookup（ java：global / ejb-1.0-SNAPSHOT / MyService）; 
 Assert.assertEquals（myService.getMessage（）， Hello！）； 
  

更新

您还需要将glassfish客户端库添加到类路径中以运行Main类。

我最初使用JUnit测试对其进行了测试，因为项目已经声明对包含Glassfish客户端的 glassfish-embeded-all 的 test 依赖性。但是IntelliJ在运行Main类时不会添加 test 库。

您可以更改 glassfish-embededall 到 runtime 或添加新的依赖项：

 < dependency> 
< groupId> org.glassfish.main.appclient< / groupId> 
< artifactId> gf-client< / artifactId> 
< version> 5.1.0< / version> 
< scope>运行时< / scope> 
< / dependency> 
  

Calling my EJB from class Main:

MyService myService = (MyService) ctx.lookup(MyService.class.getName());

Gives error:

javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:662)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:350)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at com.ejb.calculator.Main.main(Main.java:26)

How can I call my EJB?

Tried two different JNDI calls:

JNDI_NAME = "java:global/ejb/MyService";
MyService myService = (MyService) ctx.lookup(JNDI_NAME);

and

MyService myService = (MyService) ctx.lookup(MyService.class.getName());

Code:

Source link

https://bitbucket.org/powder366/ejb/src/master/ 

Glassfish commands:

asadmin start-domain --verbose
asadmin stop-domain --verbose 
http://localhost:8080/
http://localhost:4848/common/index.jsf
mvn package
asadmin deploy ejb-1.0-SNAPSHOT.jar

Screenshots:

Note:

My test cases works with the embedded container, but I can't call my external running container.

Used versions are Java8, EJB3.0, Glassfish5.0.1, Java EE8.0.1

Update1: Added log during deplyoment container-deploy-log.txt. See git remote.

Update2: Pushed the working changes to git remote.

Update3: Pushed MDB example to git remote.

解决方案

First of all, if you want to access your EJB from an external client, you need to declare a remote view.

As your EJB only has the @Local annotation, it only offers a local view. You should add the @Remote annotation.

@Local
@Remote
@Stateless
public class MyService implements IMyService {
    public String getMessage() {
        return "Hello!";
    }
}

The global JNDI name is formed by:

java:global/[EAR module]/[EJB module]/[EJB name]

in your case, as there is no EAR, would be:

java:global/ejb-1.0-SNAPSHOT/MyService

This test should work:

Context ctx = new InitialContext();
IMyService myService = (IMyService) ctx.lookup("java:global/ejb-1.0-SNAPSHOT/MyService");
Assert.assertEquals(myService.getMessage(), "Hello!");

UPDATE

You also need to add the glassfish client libraries to the classpath to run the Main class.

I originally tested it with a JUnit test, it worked for me because the project already declared a test dependency on glassfish-embeded-all that includes the glassfish client. But IntelliJ doesn't add test libraries when running a Main class.

You could either change the scope of glassfish-embeded-all to runtime or add a new dependency:

<dependency>
    <groupId>org.glassfish.main.appclient</groupId>
    <artifactId>gf-client</artifactId>
    <version>5.1.0</version>
    <scope>runtime</scope>
</dependency>

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