Example of GarbageCollectorMXBean in Java
March 25, 2013
GarbageCollectorMXBean is the interface that belongs to the package java.lang.management. GarbageCollector needs to know unreachable object to free the space. GarbageCollectorMXBean provides the information for the same. JVM can have more than one instance of GarbageCollectorMXBean.
Instance can be craeted as
List<GarbageCollectorMXBean> gcmxb = ManagementFactory.getGarbageCollectorMXBeans();
GarbageCollectorMXBeanTest.java
package com.test;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.ManagementFactory;
import java.util.List;
public class GarbageCollectorMXBeanTest {
class UserThread extends Thread {
public void run() {
List<GarbageCollectorMXBean> gcmxb = ManagementFactory.getGarbageCollectorMXBeans();
for(GarbageCollectorMXBean ob: gcmxb){
System.out.println("---------");
System.out.println("name of memory manager:"+ob.getName());
System.out.println("CollectionTime:"+ob.getCollectionTime());
String[] str=ob.getMemoryPoolNames();
for(int i=0;i<str.length;i++){
System.out.println(str[0].intern());
}
}
}
}
public static void main(String[] a){
Thread th= new GarbageCollectorMXBeanTest().new UserThread();
Runtime.getRuntime().addShutdownHook(th);
}
}
--------- name of memory manager:PS Scavenge CollectionTime:0 PS Eden Space PS Eden Space --------- name of memory manager:PS MarkSweep CollectionTime:0 PS Eden Space PS Eden Space PS Eden Space PS Eden Space
