Spring Boot Batch – Stop and Start a multithreaded step with CompositeItemWriter

I am trying to stop and start a multithreaded step through Scheduler. But I am getting exception as Caused by: org.springframework.dao.InvalidDataAccessResourceUsageException: Unexpected cursor …

Why does wait(100) cause synchronized method to fail in multi threaded?

I am referencing from Baeldung.com. Unfortunately, the article does not explain why this is not a thread safe code. Article My goal is to understand how to create a thread safe method with the …

Why is Vert.x worker verticle called from multiple threads concurrently?

my vertx (4.0.2) application written in Java (11) uses some data-heavy verticles that cause latency spikes because the eventloop gets blocked by them for a moment. For this reason i wanted to deploy …

Adding money from one account to another using multithreading

I have 2 accounts and 2 threads. 1 thread transfers money from 1 account to 2 account, 2 thread transfers money from 2 account to 1 account, if of course there is enough money. I need to realize the …

Is Android AsyncTask use multithreading because android official web says?

while learning the difference between multi-threading and Concurrency.i follow this stackoverflow answer according to my understanding AsyncTask is just used to on or off the use of main thread{ui …

Why the hang() method is only getting executed for one time?

class Demo{ static void hang(){ // Freezes/Hangs the program for some seconds. for(int i=0 ; i<100000 ; i++){ for(int j=0 ; j<10000 ; j++){ for(int k=0 ;...

java.lang.InterruptedException while running a batch file

I am trying to run a batch file which has set of services I want to restart. When I call this batch file from my Java application I get Interrupted Exception. My batch file call net stop app-service …

Why use a map in Thread to store ThreadLocal objects? [closed]

I’m reading ThreadLocal’s source codes.And I get a question which is unable to understand.That is why use a map to store ThreadLocal objects?I think use array is more suitable.Because you can define …

How to use executor service in loop for each iteration?

private ExecutorService executorService = Executors.newFixedThreadPool(3); public void myMethod(){ int batchSize = 2; // calling for 3 pages to test for(int i=0;i<3; i++) { int[…

Concurrency – Two threads querying multiple databases from different servers and compare each record synchronously

I want to have two threads querying (JDBC) two tables (from different servers/databases but related) for an ordered output then compare them or apply some logic record by record. The table size can be …