Get the uptime of your Java VM

February 8, 2012 by Michael

You don’t need JConsole or similar for just displaying the approximate uptime of your application respectively your Java Virtual Machine:

public class Demo {
	public static void main(String... args) {
		final long uptime = ManagementFactory.getRuntimeMXBean().getUptime();
		System.out.println(String.format("Up for %dms", uptime));

If you use Joda-Time (and you should if you have anything to do with date/datetime processing), you can format it nicely like so:

import java.text.MessageFormat;
import org.joda.time.Period;
import org.joda.time.PeriodType;
import org.joda.time.format.PeriodFormatter;
import org.joda.time.format.PeriodFormatterBuilder;
public class Demo {
	public static void main(String... args) {
		final Period vmUptime = new Period(ManagementFactory.getRuntimeMXBean().getUptime()).normalizedStandard(PeriodType.yearDayTime());
		final PeriodFormatter pf = new PeriodFormatterBuilder()
				.appendDays().appendLiteral(MessageFormat.format("{0,choice,0# days, |1# day, |2# days, }", vmUptime.getDays()))
		System.out.println(String.format("Up for %s", pf.print(vmUptime)));

You also have a nice example of the often unknown MessageFormat.

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