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java - 在 EJB 中重新启动窗口后的 javax.naming.NameNotFoundException

问题描述

我正在关注学习 EJB 的在线指南。在引入 Singleton（@ConcurrencyManagement、@Lock 等）之前，一切都运行良好，由 JUnit Test 进行测试。当我开始使用单例时，我发现，在测试过程中，JNDI 给出了一个关于 ClassNotFoundException 的错误。我在互联网上搜索但我没有解决它。因此，我决定重新启动我的电脑，在之前关于以前工作方法的 junit 测试之后，不工作！现在他们给了我同样的错误：ClassNotFoundException。我用wildfly9

JunitTest：

package it.html.progetto1.test;
import java.util.Properties;
import javax.naming.*;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import it.html.progetto1.ejb30.ConverterBeanRemote;
import it.html.progetto1.singleton.ejb32.NewsSingleton;
import it.html.progetto1.singleton.ejb32.NewsSingletonRemote;
import it.html.progetto1.stateful.ejb32.ShoppingCartRemote;
import junit.framework.TestCase;
public class IntegrationTestCase {
    private static Context namingContext;
    private static ConverterBeanRemote converteBeanRemote;
    private static ShoppingCartRemote<String> shoppingCartRemote;
    private static NewsSingleton<String> newsSingletonRemote;
    private static final String CONVERTER_REMOTE_JNDI_NAME="/Progetto1Ear/ProgettoEjb1/ConverterBean!it.html.progetto1.ejb30.ConverterBeanRemote";
    private static final String SHOPPING_CART_REMOTE_JNDI_NAME="/Progetto1Ear/ProgettoEjb1/ShoppingCartBean!it.html.progetto1.stateful.ejb32.ShoppingCartRemote";
    private static final String SINGLETON_REMOTE_JNDI_NAME="/Progetto1Ear/ProgettoEjb1/NewsSingletonBean!it.html.progetto1.singleton.ejb32.NewsSingletonRemote";
    @BeforeClass
    public static void obtainProxyReferences() throws NamingException{
        Properties jndiProperties = new Properties();
        jndiProperties.put("jboss.naming.client.ejb.context", true);
        jndiProperties.put(Context.PROVIDER_URL, "http-remoting://127.0.0.1:8080");
        jndiProperties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jboss.naming.remote.client.InitialContextFactory");
        namingContext = new InitialContext(jndiProperties);
    }
    @Test
    public void testConverter() throws NamingException{
        converteBeanRemote = (ConverterBeanRemote)namingContext.lookup(CONVERTER_REMOTE_JNDI_NAME);
        TestCase.assertEquals(converteBeanRemote.celsiusToFahrenheit(30.0f), 86.0f);
        TestCase.assertEquals(converteBeanRemote.fahrenheitToCelsius(86.0f), 30.0f);
    }
    @SuppressWarnings("unchecked")
    @Test
    public void testShoppingCart() throws NamingException{
        shoppingCartRemote = (ShoppingCartRemote<String>)namingContext.lookup(SHOPPING_CART_REMOTE_JNDI_NAME);
        System.out.println("Aggiunta elemento 1");
        shoppingCartRemote.addItem("Item1");
        System.out.println("Aggiunta elemento 2");
        shoppingCartRemote.addItem("Item2");
        System.out.println("Lista elementi:");
        for(String item : shoppingCartRemote.getItems()){
            System.out.println(item);
        }
        System.out.println("Rimozione elemento 1");
        shoppingCartRemote.removeItem("Item1");
        System.out.println("Lista elementi:");
        for(String item : shoppingCartRemote.getItems()){
            System.out.println(item);
        }
        shoppingCartRemote.releaseShoppingCart();
    }
    @SuppressWarnings("unchecked")
    @Test
    public void testSingleton() throws NamingException{
        newsSingletonRemote = (NewsSingletonRemote<String>)namingContext.lookup(SINGLETON_REMOTE_JNDI_NAME);
        System.out.println("Aggiunta news 1");
        newsSingletonRemote.addNews("News1");
        System.out.println("Aggiunta news 2");
        newsSingletonRemote.addNews("News2");
        System.out.println("News :");
        for(String news : newsSingletonRemote.getNews()){
            System.out.println("News:"+news);
        }
        System.out.println("Rimozione news 1");
        newsSingletonRemote.removeNews("News1");
        System.out.println("News :");
        for(String news : newsSingletonRemote.getNews()){
            System.out.println("News:"+news);
        }
    }
    @AfterClass
    public static void tearDownClass() throws NamingException {
        namingContext.close();
    }
}

在重新启动之前， testConverter() 测试有效，但之后都没有！最初只有 testSingleton() 和 testShoppingCart 坏了。

在此处输入图像描述

在包 it.html.progetto1.ejb30 我有以下类（重启后方法测试成功）

转换器.java

package it.html.progetto1.ejb30;

public interface Converter {
	  float celsiusToFahrenheit(float temperature);
	  float fahrenheitToCelsius(float temperature);
}

转换器Bean.java

package it.html.progetto1.ejb30;

import javax.ejb.LocalBean;
import javax.ejb.Stateless;

/**
 * Session Bean implementation class ConverterBean
 */
@Stateless
@LocalBean
public class ConverterBean implements ConverterBeanRemote, ConverterBeanLocal {

    /**
     * Default constructor. 
     */
    public ConverterBean() {
        // TODO Auto-generated constructor stub
    }

	@Override
	public float celsiusToFahrenheit(float temperature) {
		return temperature * 1.8f + 32;
	}

	@Override
	public float fahrenheitToCelsius(float temperature) {
		return (temperature - 32) / 1.8f;
	}

}

ConverterBeanLocal.java

package it.html.progetto1.ejb30;

import javax.ejb.Local;

@Local
public interface ConverterBeanLocal extends Converter{

}

ConverterBeanRemote.java

package it.html.progetto1.ejb30;

import javax.ejb.Remote;

@Remote
public interface ConverterBeanRemote extends Converter{

}

在包 it.html.progetto1.singleton.ejb32 单例类中，问题的开始（从未在测试中工作）：

新闻Singleton.java

package it.html.progetto1.singleton.ejb32;
import java.util.List;
public interface NewsSingleton<T> {
	  List<T> getNews();
	  void addNews(T news);
	  void removeNews(T news);
}

新闻SingletonBean.java

package it.html.progetto1.singleton.ejb32;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.ejb.AccessTimeout;
import javax.ejb.ConcurrencyManagement;
import javax.ejb.ConcurrencyManagementType;
import javax.ejb.Lock;
import javax.ejb.LockType;
import javax.ejb.Singleton;
import javax.ejb.Startup;
// @Singleton marca la classe come Session Bean Singleton
@Singleton
// @Startup fa in modo che il bean venga allocato in fase di deploy dal modulo Ejb
@Startup
// Container-Managed-Concurrency è un'astrazione semplificata del meccanismo di locking
@ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)
public class NewsSingletonBean implements NewsSingletonLocal<String>, NewsSingletonRemote<String> {
   private List<String> newsList;
   public NewsSingletonBean(){
    newsList=new ArrayList<String>();
   }
   // locca in fase di lettura, molti thread possono leggere contemporaneamente (acceso contemporaneo)
   @Lock(LockType.READ)
   /*
    *  invece di avere un thread che, dopo aver invocato un metodo con lock Read, si trova in attesa perché
    *  il singleton è in lock da parte di un altro thread, possiamo specificare un limite per l’attesa (in questo caso 15 secondi).
    *  Allo scadere del timeout, se il lock non è stato rilasciato si verifica un’eccezione.
    */
   @AccessTimeout(unit=TimeUnit.SECONDS, value=15)
   public List<String> getNews(){
    return newsList;
   }
   // locca in fase di scrittura, e quindi un solo thread alla volta scrive e gli altri sono bloccati
   @Lock(LockType.WRITE)
   public void addNews(String news){
    newsList.add(news);
   }
   @Lock(LockType.WRITE)
   public void removeNews(String news){
    newsList.remove(news);
   }
}

新闻SingletonLocal.java

package it.html.progetto1.singleton.ejb32;
import javax.ejb.Local;
@Local
public interface NewsSingletonLocal<T> extends NewsSingleton<T> {}

新闻SingletonRemote.java

package it.html.progetto1.singleton.ejb32;
import javax.ejb.Remote;
@Remote
public interface NewsSingletonRemote<T> extends NewsSingleton<T> {}

在此处输入图像描述

痕迹：

javax.naming.NameNotFoundException: Progetto1Ear -- service jboss.naming.context.java.jboss.exported.Progetto1Ear
    at org.jboss.as.naming.ServiceBasedNamingStore.lookup(ServiceBasedNamingStore.java:106)
    at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:207)
    at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:193)
    at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:189)
    at org.wildfly.naming.client.remote.RemoteServerTransport.handleLookup(RemoteServerTransport.java:200)
    at org.wildfly.naming.client.remote.RemoteServerTransport$1.handleMessage(RemoteServerTransport.java:120)
    at org.jboss.remoting3.remote.RemoteConnectionChannel.lambda$handleMessageData$3(RemoteConnectionChannel.java:430)
    at org.jboss.remoting3.EndpointImpl$TrackingExecutor.lambda$execute$0(EndpointImpl.java:991)
    at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
    at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
    at java.lang.Thread.run(Unknown Source)

标签： javaejbjndiclassnotfoundexception

解决方案

教训：检查你的服务器之前是否有异常！实际上控制台说有两个同名的localBean（ConverterBean），因此映射到同一个。更改 ConverterBean 名称（例如：CoverterBeanI）它有效，所有方法都有效。

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