上午老板给了我一个小任务：解决他笔记本不连网的时候ActiveMQ无法启动的问题。我拔了网线后，启动ActiveMQ,报下面的错：
ERROR BrokerService - Failed to start ActiveMQ JMS Message
Broker. Reason: java.net.SocketException: error setting options
java.net.SocketException: error setting options
ERROR: java.lang.RuntimeException: Failed to execute start task. Reason:
org.springframework.beans.factory.BeanCreationE
xception: Error creating bean with name
'org.apache.activemq.xbean.XBeanBrokerService' defined in class path
resource [a
ctivemq.xml]: Initialization of bean failed; nested exception is
java.net.SocketException: error setting options
ERROR: java.lang.Exception:
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'org.
apache.activemq.xbean.XBeanBrokerService' defined in class path resource
[activemq.xml]: Initialization of bean failed;
nested exception is java.net.SocketException: error setting options
网上搜索了下，发现是多播的问题，默认是允许多播的，可拔了网线后就只有一台机子了，所以多播就出问题了，我把activemq.xml里改了下：
<transportConnectors>
<transportConnector name="openwire" uri="tcp://localhost:61616"/>
<transportConnector name="ssl" uri="ssl://localhost:61617"/>
<transportConnector name="stomp" uri="stomp://localhost:61613"/>
<transportConnector uri="http://localhost:8081"/>
<transportConnector uri="udp://localhost:61618"/>
</transportConnectors>
<networkConnectors>
<!-- by default just auto discover the other brokers -->
<!--networkConnector name="default-nc" uri="multicast://default"/-->
<!--networkConnector name="jjc" uri="static:(192.168.1.112)"/-->
<!--networkConnector name="506-02" uri="static:(192.168.1.114)"/-->
<networkConnector name="host1 and host2" uri="static://(tcp://host1:61616,tcp://host2:61616)" failover="true"/>
</networkConnectors>
拔掉网线，ok，ActiveMQ启动成功，哈哈，自以为搞定的时候，发现了一个古怪的问题，我把配置文件改回去，启动ActiveMQ,居然写的通信程序客户端之间还是可以进行通话，完全不受ActiveMQ前面报的错误的影响，真是让人哭笑不得。。。
估计是哪个开发人员开的玩笑，把这个warning写成了error吧，弄的我以为ActimveMQ没启动起来，实际上是已经启动了的。。。
本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2007/10/17/927695.html，如需转载请自行联系原作者
