import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.concurrent.Semaphore;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

import com.sun.management.HotSpotDiagnosticMXBean;

public class ThreadMemoryLeak {
	private static final Semaphore sync = new Semaphore(1);

	public static void thread(final ScriptEngine scriptEngine, final long n) {
		new Thread(() -> {
			try {
				final long m = ((Long) scriptEngine.eval(n + " - 1")).longValue();
				if (m > 0)
					thread(scriptEngine, m);
				else
					sync.release();
			} catch (final ScriptException e) {
				e.printStackTrace();
			}
		}).start();

	}

	public static void main(final String[] args) throws IOException, InterruptedException {
		System.setProperty("org.jruby.embed.compat.version", "JRuby2.3");
		System.setProperty("org.jruby.embed.localcontext.scope", "concurrent");
		System.setProperty("org.jruby.embed.localvariable.behavior", "transient");

		final ScriptEngine scriptEngine = new ScriptEngineManager().getEngineByName("jruby");
		sync.acquire();
		thread(scriptEngine, 10000);

		sync.acquire(); // wait for threads to count down
		System.gc();
		Thread.sleep(1000);
		dumpHeap("jruby-memory-leak.hprof");
	}

	public static void dumpHeap(final String path) throws IOException {
		ManagementFactory
				.newPlatformMXBeanProxy(ManagementFactory.getPlatformMBeanServer(),
						"com.sun.management:type=HotSpotDiagnostic", HotSpotDiagnosticMXBean.class)
				.dumpHeap(path, true);
	}
}