JstackHelper.java

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.management.LockInfo;
import java.lang.management.ManagementFactory;
import java.lang.management.MonitorInfo;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;

public class JstackHelper {
	private static final String LF;
	static {
		LF = System.getProperty("line.separator");
	}

	public static void dump(OutputStream os) throws IOException {
		String jvmInfo = "Full thread dump " + property("java.vm.name") + "(" + property("java.runtime.version") + " "
				+ property("java.vm.info") + ")" + LF;
		String osInfo = property("os.name") + " (version=" + property("os.version") + ", arch=" + property("os.arch") + ")" + LF
				+ LF;

		Writer writer = new OutputStreamWriter(os, "utf-8");
		writer.write(jvmInfo + LF);

		writer.write("Operating System" + LF);
		writer.write("------------------" + LF);
		writer.write(osInfo);

		writer.write("Environment Variables" + LF);
		writer.write("-----------------------" + LF);

		for (Object key : System.getProperties().keySet()) {
			writer.write(key + "=" + System.getProperty(key.toString()) + LF);
		}

		writer.write(LF);

		ThreadMXBean bean = ManagementFactory.getThreadMXBean();
		long[] tids = bean.getAllThreadIds();

		writer.write("Thread dump (total=" + tids.length + ")" + LF);
		writer.write("------------------------------------------" + LF);

		for (ThreadInfo t : bean.getThreadInfo(tids, true, true)) {
			if (t == null)
				continue;

			writer.write("\"" + t.getThreadName() + "\" tid=" + t.getThreadId() + ": (state = " + t.getThreadState() + ")" + LF);
			writer.write(mergeStackTrace(t));
			writer.write(LF);
		}

		writer.flush();
	}

	private static String property(String name) {
		String s = System.getProperty(name);
		if (s == null)
			return "";
		return s;
	}

	private static String mergeStackTrace(ThreadInfo t) {
		StackTraceElement[] stacktrace = t.getStackTrace();
		MonitorInfo[] monitors = t.getLockedMonitors();

		int idx = 0;
		StringBuilder sb = new StringBuilder();
		for (StackTraceElement el : stacktrace) {
			LockInfo lock = t.getLockInfo();
			String lockOwner = t.getLockOwnerName();

			sb.append(String.format("  at %s.%s%s" + LF, el.getClassName(), el.getMethodName(), getFileAndLineNumber(el)));

			if (idx == 0) {
				if (el.getClassName().equals("java.lang.Object") && el.getMethodName().equals("wait")) {
					if (lock != null) {
						sb.append(String.format("  - waiting on <0x%016x> (%s)" + LF, lock.getIdentityHashCode(),
								lock.getClassName()));
					}
				} else if (lock != null) {
					if (lockOwner == null) {
						sb.append(String.format("  - parking to wait for <0x%016x> (%s)" + LF, lock.getIdentityHashCode(),
								lock.getClassName()));
					} else {
						sb.append(String.format("  - waiting to lock <0x%016x> (%s) owned by \"%s\" @%d" + LF,
								lock.getIdentityHashCode(), lock.getClassName(), lockOwner, t.getLockOwnerId()));
					}
				}
			}

			for (MonitorInfo monitor : monitors) {
				if (monitor.getLockedStackDepth() == idx) {
					sb.append(String.format("  - locked <0x%016x> (%s)\n", monitor.getIdentityHashCode(), monitor.getClassName()));
				}
			}

			idx++;
		}
		return sb.toString();
	}

	private static String getFileAndLineNumber(StackTraceElement el) {
		if (el.getFileName() != null && el.getLineNumber() > 0)
			return String.format(" (%s:%d)", el.getFileName(), el.getLineNumber());
		else if (el.getFileName() != null && el.getLineNumber() <= 0)
			return String.format(" (%s)", el.getFileName());
		else
			return "";
	}
}

output.txt

Full thread dump Java HotSpot(TM) 64-Bit Server VM(1.8.0_60-b27 mixed mode)

Operating System
------------------
Windows 10 (version=10.0, arch=amd64)

Environment Variables
-----------------------
(..omitted..)

Thread dump (total=5)
------------------------------------------
"Attach Listener" tid=5: (state = RUNNABLE)

"Signal Dispatcher" tid=4: (state = RUNNABLE)

"Finalizer" tid=3: (state = WAITING)
  at java.lang.Object.wait (Object.java)
  - waiting on <0x000000002a139a55> (java.lang.ref.ReferenceQueue$Lock)
  at java.lang.ref.ReferenceQueue.remove (ReferenceQueue.java:143)
  at java.lang.ref.ReferenceQueue.remove (ReferenceQueue.java:164)
  at java.lang.ref.Finalizer$FinalizerThread.run (Finalizer.java:209)

"Reference Handler" tid=2: (state = WAITING)
  at java.lang.Object.wait (Object.java)
  - waiting on <0x0000000015db9742> (java.lang.ref.Reference$Lock)
  at java.lang.Object.wait (Object.java:502)
  at java.lang.ref.Reference$ReferenceHandler.run (Reference.java:157)

"main" tid=1: (state = RUNNABLE)
  at sun.management.ThreadImpl.dumpThreads0 (ThreadImpl.java)
  at sun.management.ThreadImpl.getThreadInfo (ThreadImpl.java:440)
  at JstackHelper.dump (JstackHelper.java:52)
  at Sandbox.main (Sandbox.java:9)

좋은 정보 감사합니다.
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