Which Thread.sleep commands pauses which threads?

I have four declarations of Thread.sleep(…) below. Each of the declarations is marked with that Line #1 to #6. My question is which declarations put which threads to pause? class Runa extends Thread{…

JavaFX Multithreading and Progressbar

I have a problem with freeze GUI. I’m a beginner with JavaFX and don’t know what I’m doing wrong. VideoToImages is background method from which I’m getting IntegerProperties to set progressBar value. …

Java happens-before relationship?

Consider the following code. public class Test { private boolean running = false; public void run() { running = true; } public void test() { boolean running1 = …

How to use blocking queue in Spring Boot?

I am trying to use BlockingQueue inside Spring Boot. My design was like this: user submit request via a controller and controller in turn puts some objects onto a blocking queue. After that the …

What is active thread group in Java?

There is method java.lang.ThreadGroup.activeGroupCount() returns an estimate of the number of active groups in a thread group. In response to this question, the active thread is defined. But what does …

Can’t make changes to interface in a runnable with JavaFX

In my program, I am running a separate script and I am using concurrency to run the separate script, and therefore using a class implementing Runnable. When the the separate thread is running, I want …

Java Fork/Join Pool : Is it right to assume that number of threads in fork join pool depends entirely on underlying number of CPU’s?

Can a developer tell fork/join pool to create certain number of threads? If yes then is it guaranteed that those many number of threads will be created by pool?

I have a function, and in it i am running an thread using Anonymous class, so how to return value to that function

The code below will make it more clear: public static String TCMResponse(String params, final Context c) { final String url = “https://115.248.161.106/ois/API/android/” + params; new …

How to iterate on concurrentLinkedQueue by multiple threads?

In my application data producing speed (which is stored in in concurrentLinkedQueue) is greater than i can consume with single thread. I have decided to start with creating 4 threads to consume the …

Spring Data Redis JedisConnectionException: Unexpected end of stream

Redis 3.0.5 Spring Data Redis 1.3.6 jedis 2.6.3 – Our is web application which receives data from redis over pub/sub. – Also performs read/write of data on redis as key/value pairs. – read/write …