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    <p>I would create a thread that continously lists all running threads on the JVM.<br> Then each time it noticies that a new thread has appeared, it would notify in either way a class in your code.</p> <p>Here are some links about how to list all threads currently running on the JVM :</p> <ol> <li><p><a href="https://stackoverflow.com/questions/1323408/get-a-list-of-all-threads-currently-running-in-java">Get a List of all Threads currently running in Java</a></p></li> <li><p><a href="http://www.exampledepot.com/egs/java.lang/ListThreads.html" rel="nofollow noreferrer">Listing All Running Threads</a></p></li> </ol> <p>============</p> <p>A starting code :</p> <p><strong>ThreadCreationListener.java</strong></p> <pre><code>public interface ThreadCreationListener { public void onThreadCreation(Thread newThread); } </code></pre> <p><strong>ThreadCreationMonitor.java</strong></p> <pre><code>public class ThreadCreationMonitor extends Thread { private List&lt;ThreadCreationListener&gt; listeners; private boolean canGo; public ThreadCreationMonitor() { listeners = new Vector&lt;ThreadCreationListener&gt;();//Vector class is used because many threads may use a ThreadCreationMonitor instance. canGo = true; // Initialize the rest of the class here... } // Most important methods public void addListener(ThreadCreationListener tcl) { listeners.add(tcl); } public void removeListener(ThreadCreationListener tcl) { listeners.remove(tcl); } public void run() { List&lt;Thread&gt; runningThreads; List&lt;Thread&gt; lastRunningThreads; while(canGo) { // Step 1 - List all running threads (see previous links) // runningThreads = ... // Step 2 - Check for new threads and notify all listeners if necessary if (runningThreads.removeAll(lastRunningThreads)==true) { for(Thread t : runningThreads) { for(ThreadCreationListener tcl : listeners) { tcl.onThreadCreation(t);//Notify listener } } } } } public void shutdown() { canGo = false; } </code></pre> <p>}</p> <p><strong>MyThreadInfoConsumer.java</strong></p> <pre><code>public class MyThreadInfoConsumer implements ThreadCreationListener { public void onThreadCreation(Thread newThread) { // Process here the notification... } } </code></pre> <p><strong>Main.java</strong></p> <pre><code>public class Main { public static void main(String[] args) { ThreadCreationMonitor tcm = new ThreadCreationMonitor(); tcm.start(); MyThreadInfoConsumer myTIC = new MyThreadInfoConsumer(); tcm.addListener(myTIC); // rest of your code... // Don't forget to call tcm.shutdown() when exiting your application ! } } </code></pre>
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    1. COThese examples are good and useful, but there is no listener behaviour. I would like to have the information that new thread is gonna created by jvm let's say 'instatntly' without overriding anything.
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      1. USŁukasz Rzeszotarski
    2. CO@ŁukaszRzeszotarski you can implement a listener behavior from the examples above though, they are about running threads not created threads (as you asked).
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