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Is the Runnable started by the AsyncContext in a Servlet thread safe?


Is the Runnable started by the AsyncContext in a Servlet thread safe?

By : Ingo13F
Date : November 17 2020, 01:00 AM
like below fixes the issue No Java code, unless explicitly written like so, is inherently thread safe. AsyncContext exposes a start(Runnable) method that accepts a Runnable value. If you have a Runnable instance and pass it as an argument to start(..) and then re-use it in some other thread, its thread-safety might be compromised.
What's more, if your Runnable was initialized with some state that is shared with other parts of your app, its thread-safety will again be uncertain.
code :


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runnable that started on a new thread does not stop when removeCallbacks() is called

runnable that started on a new thread does not stop when removeCallbacks() is called


By : M. Cat
Date : March 29 2020, 07:55 AM
help you fix your problem I have the following below code.
code :
public class MainActivity extends Activity {

    public static final int UPDATE = 1;
    public static final int WORK = 2;

    private Handler uiHandler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case UPDATE:
                // Perform UI updates here
                ....
                // UI Updates done, schedule WORK in 30 seconds:
                this.sendMessageDelayed(this.obtainMessage(WORK), 30000);
                break;
            case WORK:
                new Thread(doWork).start();
                break;

            default:
                super.handleMessage(msg);
            }
        }

    };

private WeakReference<Handler> handlerRef = new WeakReference<Handler>( uiHandler );

    private Runnable doWork = new Runnable() {

        @Override
        public void run() {
            // This will run on a different thread.

            // If UI is still around, tell it to update
            Handler ui = handlerRef.get();
            if( ui != null )
                ui.sendEmptyMessage(MainActivity.UPDATE);
        }
    };  

    @Override
    protected void onPause() {
        uiHandler.removeMessages(WORK);
        super.onPause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        // Resume UI updates in 500ms, allowing UI to settle
        uiHandler.sendMessageDelayed(uiHandler.obtainMessage(WORK), 500);
    }

    ....
}
Quartz2.x: GRAVE: The web application [/servlet] appears to have started a thread named [Thread-4] but has failed to sto

Quartz2.x: GRAVE: The web application [/servlet] appears to have started a thread named [Thread-4] but has failed to sto


By : Krotitelj Kurvi
Date : March 29 2020, 07:55 AM
This might help you This may be caused by not shutting down the Quartz scheduler upon Tomcat shutdown or web-application redeploy (most likely your case).
You will need to implement a ServletContextListener and in its contextDestroyed method you will need to do this:
code :
scheduler.shutdown( true );  // true = wait for jobs to complete
// you may want to give Quartz some extra time to shutdown
//Thread.sleep(1000);
How can I be sure that my android runnable started on a worker thread?

How can I be sure that my android runnable started on a worker thread?


By : jchun
Date : March 29 2020, 07:55 AM
seems to work fine I am trying to learn about doing background tasks on Android/Java by using threading. I made a simple test application which purely did a new Thread(new Runnable()) and did sleeps inside the runnable. When this was running, I was still able to click on buttons on my UI (I could see the visual feedback). , backgroundThread.run() - > backgroundThread.start()?
implement Runnable Run() when thread is started

implement Runnable Run() when thread is started


By : letrollpoilu
Date : March 29 2020, 07:55 AM
wish helps you Since you are trying to update the UI, you need to do it on the UI Thread. You should use something like runOnUiThread() or AsyncTask.
Grails project - Servlet call - ClassNotFoundException: javax.servlet.AsyncContext

Grails project - Servlet call - ClassNotFoundException: javax.servlet.AsyncContext


By : Gerrit A. Smit
Date : March 29 2020, 07:55 AM
I wish did fix the issue. After Couple of days of searching and integrating i found the solution .....
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