【发布时间】：2017-12-24 15:53:17
【问题描述】：
我正在尝试从一本书（HornetQ Messaging Developers Guide）中运行一个简单的 HornetQ 示例，但收到错误消息。我没有使用 maven，因为我想紧贴书中给出的示例。 HornetQ Standalone 服务器在命令行中正常启动。我只是想向 HonretQ 服务器发送消息。
package chapter01;
import javax.jms.JMSException;
import javax.naming.NamingException;
public class ECGMessageConsumerProducerExample {
public static void main(String[] args) throws NamingException, JMSException {
// TODO Auto-generated method stub
javax.naming.Context ic = null;
javax.jms.ConnectionFactory cf = null;
javax.jms.Connection connection = null;
javax.jms.Queue queue = null;
javax.jms.Session session = null;
com.mongodb.Mongo m;
com.mongodb.DB db;
String destinationName = "queue/DLQ";
java.util.Properties p = new java.util.Properties();
p.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY,
"org.jnp.interfaces.NamingContextFactory");
p.put(javax.naming.Context.URL_PKG_PREFIXES,
"org.jboss.naming:org.jnp.interfaces");
p.put(javax.naming.Context.PROVIDER_URL, "jnp://localhost:1099");
ic = new javax.naming.InitialContext(p);
cf = (javax.jms.ConnectionFactory)ic.lookup("/ConnectionFactory");
queue = (javax.jms.Queue)ic.lookup(destinationName);
connection = cf.createConnection();
session = connection.createSession(false, javax.jms.Session.AUTO_ACKNOWLEDGE);
connection.start();
String theECG = "1;02/20/2012 14:01:59.010;1020,1021,1022";
javax.jms.MessageProducer publisher = session.createProducer(queue);
javax.jms.TextMessage message =
session.createTextMessage(theECG);
publisher.send(message);
System.out.println("Message sent!");
publisher.close();
}
}
即使我添加了书中提到的所有罐子，我仍然收到以下错误：
Exception in thread "main" java.lang.NoClassDefFoundError: Lorg/hornetq/core/logging/Logger;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredField(Unknown Source)
at java.io.ObjectStreamClass.getDeclaredSUID(Unknown Source)
at java.io.ObjectStreamClass.access$700(Unknown Source)
at java.io.ObjectStreamClass$2.run(Unknown Source)
at java.io.ObjectStreamClass$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.ObjectStreamClass.<init>(Unknown Source)
at java.io.ObjectStreamClass.lookup(Unknown Source)
at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at org.hornetq.jms.referenceable.SerializableObjectRefAddr.deserialize(SerializableObjectRefAddr.java:79)
at org.hornetq.jms.referenceable.ConnectionFactoryObjectFactory.getObjectInstance(ConnectionFactoryObjectFactory.java:43)
at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source)
at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1479)
at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1496)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:822)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:686)
at javax.naming.InitialContext.lookup(Unknown Source)
at chapter01.ECGMessageConsumerProducerExample.main(ECGMessageConsumerProducerExample.java:31)
Caused by: java.lang.ClassNotFoundException: org.hornetq.core.logging.Logger
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 27 more
我还添加了一堆我发现与此主题相关的其他 jar，但没有解决问题。
产生错误是否有原因？
【问题讨论】：
-
可能两个类路径都有不同版本的 jar - 这可以解释 NoClassDefFound 。序列化/反序列化失败。尝试匹配客户端和服务器中的 jars。
-
我猜你是对的，但我真的不知道如何匹配它们。 HornetQ 根目录中有一个 lib 文件夹，其中包含一堆罐子。但是里面甚至没有 hornet-core.jar。