Thread stack dump method

/*
 * Method that dumps the stack trace for all of the threads to a file
 */
public static final String NEWLINE = System.getProperty("line.separator");

public void dumpStack(String message, Writer writer) throws IOException {
    ThreadMXBean mxBean = ManagementFactory.getThreadMXBean();
    ThreadInfo[] threadInfos = mxBean.getThreadInfo(mxBean.getAllThreadIds(), 0);
    Map<Long, ThreadInfo> threadInfoMap = new HashMap<Long, ThreadInfo>();
    for (ThreadInfo threadInfo : threadInfos) {
        threadInfoMap.put(threadInfo.getThreadId(), threadInfo);
    }

    try {
        if (message != null) {
            writer.write(message);
            writer.write(NEWLINE);
        }
        Map<Thread, StackTraceElement[]> stacks = Thread.getAllStackTraces();
        writer.write("Dump of " + stacks.size() + " threads at "
                + new SimpleDateFormat("yyyy/MM/dd HH:mm:ss z").format(new Date(System.currentTimeMillis()))
                + NEWLINE + NEWLINE);
        for (Map.Entry<Thread, StackTraceElement[]> entry : stacks.entrySet()) {
            Thread thread = entry.getKey();
            writer.write("\"" + thread.getName() + "\" prio=" + thread.getPriority() + " tid=" + thread.getId()
                    + " " + thread.getState() + " " + (thread.isDaemon() ? "deamon" : "worker") + NEWLINE);
            ThreadInfo threadInfo = threadInfoMap.get(thread.getId());
            if (threadInfo != null) {
                writer.write("    native=" + threadInfo.isInNative() + ", suspended=" + threadInfo.isSuspended()
                        + ", block=" + threadInfo.getBlockedCount() + ", wait=" + threadInfo.getWaitedCount()
                        + NEWLINE);
                writer.write("    lock="
                        + threadInfo.getLockName()
                        + " owned by "
                        + threadInfo.getLockOwnerName()
                        + " ("
                        + threadInfo.getLockOwnerId()
                        + "), cpu="
                        + TimerHelper.durationMillisToString(mxBean.getThreadCpuTime(threadInfo.getThreadId()) / 1000000L)
                        + ", user="
                        + TimerHelper.durationMillisToString(mxBean.getThreadUserTime(threadInfo.getThreadId()) / 1000000L)
                        + NEWLINE);
            }
            for (StackTraceElement element : entry.getValue()) {
                writer.write("    ");
                String eleStr = element.toString();
                if (eleStr.startsWith("com.mprew")) {
                    writer.write(">>  ");
                } else {
                    writer.write("    ");
                }
                writer.write(eleStr);
                writer.write(NEWLINE);
            }
            writer.write(NEWLINE);
        }
        writer.write("------------------------------------------------------");
        writer.write(NEWLINE);
        writer.write("Non-daemon threads: ");
        for (Thread thread : stacks.keySet()) {
            if (!thread.isDaemon()) {
                writer.write("\"" + thread.getName() + "\", ");
            }
        }
        writer.write(NEWLINE);
        writer.write("------------------------------------------------------");
        writer.write(NEWLINE);
        writer.write("Blocked threads: ");
        for (Thread thread : stacks.keySet()) {
            if (thread.getState() == State.BLOCKED) {
                writer.write("\"" + thread.getName() + "\", ");
            }
        }
        writer.write(NEWLINE);
    } finally {
        writer.close();
    }
}