Small code to be able to check a VM and the activated GC. Also useful to run a VM so that you have time to run VisualVM or something similar.

WhichGC.java

import java.util.*;
import java.lang.management.*;

public class WhichGC
{
  public static void main(String[] args) throws Exception
	{
		int seconds = 60;
		if(args.length>=1)
		{
			seconds = Integer.parseInt(args[0]);
		}
		List<GarbageCollectorMXBean> l = ManagementFactory.getGarbageCollectorMXBeans();
		for(GarbageCollectorMXBean b : l) {
			System.out.println(b.getName());
		}
		System.out.printf("Let's now wait for %d seconds as requested so that you can run "+
		                  "VisualVM or an equivalent to check the running VM\n", seconds);
		Thread.sleep(seconds*1000);
	}
}