我是一个尝试将 qpid 与 Apache Camel 集成的新手。我需要使用 qpid 编写java代码来从队列中读取和写入。
首先，我从qpid网站下载了JMS示例。我想要运行的代码是。
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package org.apache.qpid.jms.example;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.DeliveryMode;
import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.Context;
import javax.naming.InitialContext;
public class HelloWorld {
public static void main(String[] args) throws Exception {
try {
// The configuration for the Qpid InitialContextFactory has been supplied in
// a jndi.properties file in the classpath, which results in it being picked
// up automatically by the InitialContext constructor.
Context context = new InitialContext();
ConnectionFactory factory = (ConnectionFactory) context.lookup("myFactoryLookup");
Destination queue = (Destination) context.lookup("myQueueLookup");
Connection connection = factory.createConnection(System.getProperty("USER"), System.getProperty("PASSWORD"));
connection.setExceptionListener(new MyExceptionListener());
connection.start();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer messageProducer = session.createProducer(queue);
MessageConsumer messageConsumer = session.createConsumer(queue);
TextMessage message = session.createTextMessage("Hello world!");
messageProducer.send(message, DeliveryMode.NON_PERSISTENT, Message.DEFAULT_PRIORITY, Message.DEFAULT_TIME_TO_LIVE);
TextMessage receivedMessage = (TextMessage) messageConsumer.receive(2000L);
if (receivedMessage != null) {
System.out.println(receivedMessage.getText());
} else {
System.out.println("No message received within the given timeout!");
}
connection.close();
} catch (Exception exp) {
System.out.println("Caught exception, exiting.");
exp.printStackTrace(System.out);
System.exit(1);
}
}
private static class MyExceptionListener implements ExceptionListener {
@Override
public void onException(JMSException exception) {
System.out.println("Connection ExceptionListener fired, exiting.");
exception.printStackTrace(System.out);
System.exit(1);
}
}
}
这取决于文件::
# Set the InitialContextFactory class to use
java.naming.factory.initial = org.apache.qpid.jms.jndi.JmsInitialContextFactory
# Define the required ConnectionFactory instances
# connectionfactory.<JNDI-lookup-name> = <URI>
connectionfactory.myFactoryLookup = amqp://localhost:5672
# Configure the necessary Queue and Topic objects
# queue.<JNDI-lookup-name> = <queue-name>
# topic.<JNDI-lookup-name> = <topic-name>
queue.myQueueLookup = queue
topic.myTopicLookup = topic
现在我明白，为了实现这一点，我需要一种称为Broker服务的东西。做了一些研究，我发现我可以将RabbitMQ用于此目的。所以我将它下载到我的Windows机器上，并尝试通过端口localhost:5672
但是当我运行我的代码时，我得到了ERROR ::
2017-05-04 11:28:29,329 [main ] - ERROR JmsConnection - Failed to connect to remote at: amqp://localhost:5672
Caught exception, exiting.
javax.jms.JMSException: An existing connection was forcibly closed by the remote host
at org.apache.qpid.jms.exceptions.JmsExceptionSupport.create(JmsExceptionSupport.java:86)
at org.apache.qpid.jms.exceptions.JmsExceptionSupport.create(JmsExceptionSupport.java:108)
at org.apache.qpid.jms.JmsConnection.connect(JmsConnection.java:172)
at org.apache.qpid.jms.JmsConnectionFactory.createConnection(JmsConnectionFactory.java:204)
at org.apache.qpid.jms.example.HelloWorld.main(HelloWorld.java:48)
Caused by: java.io.IOException: An existing connection was forcibly closed by the remote host
at sun.nio.ch.SocketDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1100)
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:372)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:123)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:624)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:559)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:476)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
at java.lang.Thread.run(Thread.java:745)
为什么会发生此错误？虽然这个端口肯定是在我的本地机器上听。再次，我是JMS的新手，所以任何指导将非常感谢:)
答案 0 :(得分：1)
看起来您可能正在使用Qpid JMS AMQP v1.0 client，除非您使用RabbitMQ的实验性AMQP 1.0插件，否则无法连接到RabbitMQ。
确保您使用的是与您正在运行的代理兼容的客户端。
答案 1 :(得分：1)
正如蒂姆所说，你至少还需要确保经纪人实验性的AMQP 1.0插件被加载，你没有提到。
然而，在这种情况下，它可能没有多大区别。我之前使用JMS客户端或其他一些AMQP 1.0客户端对RabbitMQ没有太大成功，因为我报告的一个问题在创建消费者和生产者时阻止了他们：https://github.com/rabbitmq/rabbitmq-amqp1.0/issues/34
您提到的决定使用RabbitMQ的研究事项，听起来您与现有的服务器解决方案无关？如果是这样，对于其他支持AMQP 1.0且经常使用JMS客户端的服务器，您可以尝试使用ActiveMQ，ActiveMQ Artemis，Qpid for Java broker，Qpid C ++代理或Qpid Dispatch路由器（在Windows上不起作用，提及使用）等等。