Question

我试图在JBoss 6.1.0（Java EE 6 - Hornetq）上运行一个运行MDB的简单Web应用程序来尝试JMS和MDB。我还需要一个简单的独立客户端，它在MDB正在侦听的队列上发送文本消息。这只是一次尝试，所以客户端发送一个简单的“你好世界”就足够了！＆＃34;文本消息和MDB只是读取它并将其写入日志。我在互联网上发现了很多例子，但有人使用Glassfish作为服务器，另外还没有解释导入客户端的正确库是什么，另外还没有解释如何执行队列和连接工厂查找时客户端是远程的，所以我仍然无法实现正常运行的应用程序。

以下是我创建的MDB的代码：

package it.test.mymdb;

import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 @messageDriven(
    activationConfig = {
        @ActivationConfigProperty(propertyName = "destinationType",
                                  propertyValue = "javax.jms.Queue"),
        @ActivationConfigProperty(propertyName = "destination",
                                  propertyValue = "myQueue")})
public class MyMDB implements MessageListener {
    private static final Logger logger = LoggerFactory.getLogger(MyMDB.class);

    @Override
    public void onMessage(Message message) {
        try {
            logger.info("Messaggio ricevuto");
            TextMessage txtMsg = (TextMessage) message;
            logger.info(txtMsg.getText());
        }
        catch (JMSException ex) {
            logger.error("Errore durante la lettura del testo del messaggio.");
        }
    }
}

这是我定义队列和连接工厂的hornetq-jms.xml文件：

<?xml version="1.0"?>
<configuration xsi:schemaLocation="urn:hornetq /schema/hornetq-jms.xsd"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
               xmlns="urn:hornetq">
    <connection-factory name="myConnectionFactory">
        <connectors>
            <connector-ref connector-name="netty"/>
        </connectors>
        <entries>
            <entry name="/myConnectionFactory"/>
        </entries>
    </connection-factory>

    <queue name="myQueue">
        <entry name="/queue/myQueue" />
    </queue>
</configuration>

问题1：我是否要在此文件中插入＆＃34; user＆＃34;和＃34;密码＆＃34;客户端执行JNDI搜索所需的数据？如果是，怎么样？

我的MDB部署似乎有效，如果我访问JBoss管理面板，我会看到队列：

Name: myQueue
JNDI Binding: /queue/myQueue
Address: jms.queue.myQueue
Temporary: false
Paused: false

和连接工厂：

Name: myConnectionFactory
JNDI Bindings: /myConnectionFactory

这是我客户的（不工作）代码：

package it.test.mymdbclient;

import java.util.Hashtable;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.QueueSender;
import javax.jms.QueueSession;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class MyMdbClient {
    private final static String JNDI_FACTORY = "org.jboss.naming.remote.client.InitialContextFactory";
    private final static String JMS_FACTORY = "myConnectionFactory";
    private final static String QUEUE = "queue/myQueue";
    private final static String jbossUrl = "remote://localhost:4447";

    private static InitialContext getInitialContext() throws NamingException {
        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY, JNDI_FACTORY);
        env.put(Context.PROVIDER_URL, jbossUrl);
        env.put(Context.SECURITY_PRINCIPAL, "admin"); //PROBABLY THOSE CREDENTIALS ARE NOT CORRECT
        env.put(Context.SECURITY_CREDENTIALS, "admin");
        return new InitialContext(env);
    }

    public static void main(String[] args) throws Exception {
        InitialContext ic = getInitialContext();
        QueueConnectionFactory qconFactory = (QueueConnectionFactory) ic.lookup(JMS_FACTORY);
        QueueConnection qcon = qconFactory.createQueueConnection("admin", "admin"); //PROBABLY THOSE CREDENTIALS ARE NOT CORRECT
        QueueSession qsession = qcon.createQueueSession(false,Session.AUTO_ACKNOWLEDGE);
        Queue queue = (Queue) ic.lookup(QUEUE);
        QueueSender qsender = qsession.createSender(queue);
        qcon.start();
        TextMessage msg = qsession.createTextMessage();
        msg.setText("Hello world! :)");
        qsender.send(msg);
        qsender.close();
        qsession.close();
        qcon.close();
    }
}

这是我导入的库，但我几乎可以肯定它是不够的，这是引发异常的原因。如果它是我需要的其他图书馆吗？

<dependency>
    <groupId>org.hornetq</groupId>
    <artifactId>hornetq-jms-client</artifactId>
    <version>2.3.9.Final</version>
</dependency>

这是我运行客户端时抛出的异常：

Exception in thread "main" javax.naming.NoInitialContextException: Cannot instantiate class: org.jboss.naming.remote.client.InitialContextFactory [Root exception is java.lang.ClassNotFoundException: org.jboss.naming.remote.client.InitialContextFactory]
    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:674)
    at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
    at javax.naming.InitialContext.init(InitialContext.java:244)
    at javax.naming.InitialContext.<init>(InitialContext.java:216)
    at it.test.mymdbclient.MyMdbClient.getInitialContext(MyMdbClient.java:27)
    at it.test.mymdbclient.MyMdbClient.main(MyMdbClient.java:31)
Caused by: java.lang.ClassNotFoundException: org.jboss.naming.remote.client.InitialContextFactory
    at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:340)
    at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:72)
    at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:61)
    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:672)
    ... 5 more

Answer 1

异常正在发生，因为您忘记添加＆＃34; jboss-client.jar ＆＃34;它位于jboss文件夹中：

＆＃34; jbdevstudio \运行时\的JBoss-EAP \ BIN \客户\＆＃34;

这应该有效，并记得在运行客户端之前启动服务器

Answer 2

看到这[link] [1]和[this] [2]，这是同样的错误，你需要将jar放入classpath服务器。我希望有所帮助。

JBoss 6.1.0 / Hornetq上的简单MDB JMS客户端 - 服务器应用程序

2 个答案: