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我正在尝试遵循Java API文档中的一个示例(http://download.oracle.com/javase/1.5.0/docs/api/java/lang/management/ MemoryPoolMXBean.html#Notification)与Memory Pool Beans和通知的UsageThreshold属性相关。每当游泳池超过门槛时,我的意图就是做一些事情。这是示例代码:远程JMX连接和通知问题
MemoryPoolMXBean remoteOldGenMemoryPool =
ManagementFactory.newPlatformMXBeanProxy(
jmxServer,
"java.lang:type=MemoryPool,name=PS Old Gen",
MemoryPoolMXBean.class);
class MyListener implements javax.management.NotificationListener {
public void handleNotification(Notification notification, Object handback) {
String notifType = notification.getType();
if (notifType.equals(MemoryNotificationInfo.MEMORY_THRESHOLD_EXCEEDED)) {
// Do Something
println "Threshold passed";
}
}
}
// Register MyListener with MemoryMXBean
MemoryMXBean remoteMemory =
ManagementFactory.newPlatformMXBeanProxy(
jmxServer,
ManagementFactory.MEMORY_MXBEAN_NAME,
MemoryMXBean.class);
NotificationEmitter emitter = remoteMemory as NotificationEmitter;
MyListener listener = new MyListener();
emitter.addNotificationListener(listener, null, null);
remoteOldGenMemoryPool.setUsageThreshold 500000000;
当我执行的代码,并连接到我的JVM,我可以看到以下内容:
Threshold passed
02-Feb-2011 16:30:00 ClientCommunicatorAdmin restart
WARNING: Failed to restart: java.io.IOException: Failed to get a RMI stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
java.net.SocketException: Connection reset]
02-Feb-2011 16:30:03 RMIConnector RMIClientCommunicatorAdmin-doStop
WARNING: Failed to call the method close():java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
java.net.SocketException: Connection reset
02-Feb-2011 16:30:03 ClientCommunicatorAdmin Checker-run
WARNING: Failed to check connection: java.net.SocketException: Connection reset
02-Feb-2011 16:30:03 ClientCommunicatorAdmin Checker-run
WARNING: stopping
出于某种原因(我不明白还)代码正在尝试重新启动与JVM的连接。任何想法为什么会发生这种情况,或者如何预防这种情况?我在做错吗?
感谢
看来这实际上是一个让JMX连接保持活着的问题。 ClientCommunicatorAdmin内有一个守护线程(Checher),每分钟检查一次连接。 – Gotxi 2011-02-03 11:45:50