我用tcp协议连接和发送消息都正常，当我用UDP协议，将ActiveMQ的配置文件
        <transportConnectors>
          
    <transportConnector name="udp" uri="udp://localhost:61618?trace=true"/>
        </transportConnectors>
然后在代码中进行相应的修改
factory = new ActiveMQConnectionFactory("udp://localhost:61618");
connection = factory.createConnection();
connection.start();

然后会报异常：
javax.jms.JMSException:
org.apache.activemq.transport.RequestTimedOutIOException
        at
org.apache.activemq.util.JMSExceptionSupport.create(JMSExceptionSupport.java:62)
        at
org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnection.java:1298)
        at
org.apache.activemq.ActiveMQConnection.ensureConnectionInfoSent(ActiveMQConnection.java:1384)
        at
org.apache.activemq.ActiveMQConnection.start(ActiveMQConnection.java:504)
(AbstractCommunication.java:109)
        Caused by: org.apache.activemq.transport.RequestTimedOutIOException
        at
org.apache.activemq.transport.FutureResponse.getResult(FutureResponse.java:54)
        at
org.apache.activemq.transport.reliable.ReliableTransport.request(ReliableTransport.java:81)
        at
org.apache.activemq.transport.TransportFilter.request(TransportFilter.java:93)
        at
org.apache.activemq.ActiveMQConnection.syncSendPacket(ActiveMQConnection.java:1276)
        ... 6 more
不知各位有没有遇到过这种情况

没有啊，我现在遇到的问题是java.lang.ClassCastException: org.apache.activemq.ActiveMQConnection cannot be cast to org.apache.activemq.broker.Connection
我报这个错，一直在找解决的方法！你说的这个问题我没有遇到啊！