我编写了一个代码，它通过 JMX Bean 从我的 JVM 应用程序中公开数据。我可以在 JConsole 中看到这些值。如何从 jconsole 中获取这些值，是否需要编写另一个程序。
还有，如何使用 REST API 将这些 JMX Bean 数据显示为 Rich UI 格式？
我用过 Jolokia，我收到了这个回复。我没有得到任何信息。
我在我的代码中使用了 jolokia 作为 JVM 参数。但我得到的唯一答复是这个
{
timestamp: 1411988073,
status: 200,
request: {
type: "version"
},
value: {
protocol: "7.2",
config: {
maxDepth: "15",
maxCollectionSize: "1000",
maxObjects: "0",
discoveryEnabled: "true",
agentContext: "/jolokia",
historyMaxEntries: "10",
agentId: "10.91.240.11-4524-5f2e712f-jvm",
agentType: "jvm",
debug: "false",
debugMaxEntries: "100"
},
agent: "1.2.2",
info: { }
}
}
为什么没有信息？
我的代码是这样的：
/*
* Main.java - main class for the Hello MBean and QueueSampler MXBean example.
* Create the Hello MBean and QueueSampler MXBean, register them in the platform
* MBean server, then wait forever (or until the program is interrupted).
*/
package com.example;
public class Main implements HelloMBean {
public static void main(String[] args) throws Exception {
// Get the Platform MBean Server
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
// Construct the ObjectName for the Hello MBean we will register
ObjectName mbeanName = new ObjectName(
"com.example:type=Tiger, name=Info");
// Create the Hello World MBean
Hello mbean = new Hello();
System.out.println(mbean);
System.out.println(mbeanName);
// Register the Hello World MBean
mbs.registerMBean(mbean, mbeanName);
if (System.getProperty("com.sun.management.jmxremote") == null) {
System.out.println("JMX remote is disabled");
} else {
String portString = System.getProperty("com.sun.management.jmxremote.port");
if (portString != null) {
System.out.println("JMX running on port "
+ Integer.parseInt(portString));
}}
// Wait forever
System.out.println("Waiting for incoming requests...");
Thread.sleep(Long.MAX_VALUE);
}
/*
* private final String name = "Reginald"; private int cacheSize =
* DEFAULT_CACHE_SIZE; private static final int DEFAULT_CACHE_SIZE = 200;
*/
@Override
public void sayHello() {
// TODO Auto-generated method stub
}
@Override
public int add(int x, int y) {
// TODO Auto-generated method stub
return 0;
}
@Override
public String getName() {
// TODO Auto-generated method stub
return null;
}
@Override
public int getCacheSize() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void setCacheSize(int size) {
// TODO Auto-generated method stub
}
}
界面是：
package com.example;
public interface HelloMBean {
public void sayHello();
public int add(int x, int y);
public String getName();
// a read-write attribute called CacheSize of type int
public int getCacheSize();
public void setCacheSize(int size);
}
和这样的实现：
package com.example;
import javax.management.*;
public class Hello
extends NotificationBroadcasterSupport implements HelloMBean {
public void sayHello() {
System.out.println("hello, world");
}
public int add(int x, int y) {
return x + y;
}
public String getName() {
return this.name;
}
public int getCacheSize() {
return this.cacheSize;
}
public synchronized void setCacheSize(int size) {
int oldSize = this.cacheSize;
this.cacheSize = size;
System.out.println("Cache size now " + this.cacheSize);
Notification n =
new AttributeChangeNotification(this,
sequenceNumber++,
System.currentTimeMillis(),
"CacheSize changed",
"CacheSize",
"int",
oldSize,
this.cacheSize);
sendNotification(n);
}
@Override
public MBeanNotificationInfo[] getNotificationInfo() {
String[] types = new String[] {
AttributeChangeNotification.ATTRIBUTE_CHANGE
};
String name = AttributeChangeNotification.class.getName();
String description = "An attribute of this MBean has changed";
MBeanNotificationInfo info =
new MBeanNotificationInfo(types, name, description);
return new MBeanNotificationInfo[] {info};
}
private final String name = "Reginald";
private int cacheSize = DEFAULT_CACHE_SIZE;
private static final int DEFAULT_CACHE_SIZE = 200;
private long sequenceNumber = 1;
}