Questions tagged [java-threads]
For questions related to Java threads, including concurrent data structures, the fork-join framework, atomic classes, thread locking/synchronization, visibility and latency
java-threads
1,069
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Cyclicbarrier implementation in Java, can it be used as a latch too
Here is my implementation of CyclicBarrier
public class CyclicBarrier {
int numParties, arrived;
Semaphore mutex;
Semaphore barrier1, barrier2;
public CyclicBarrier(int parties) {
...
- 2,473
0
votes
1
answer
53
views
What problems can I have with spawning a set of new threads from Servlet and what alternatives exist?
For simplicity, I will omit some details and try to highlight the main point:
I have a servlet that consumes users' requests, when a user sends a request I need to gather data from many endpoints. One ...
- 1,222
1
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0
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46
views
How to catch any exceptions that occurs in a Future that is being interrupted in Java?
I am trying to implement a timeout on a save operation on a PDF document. I have this piece of code so far:
private Boolean saveDocumentWithTimeout(Path path, PDDocument pdDocument) {
...
- 650
1
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0
answers
44
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Facing issue in threading [closed]
I am calling threads based on records selected from database.
However, I am seeing that same records are initiated multiple times in the thread.
Also I am inserting records in the keyvaluepairs inside ...
0
votes
0
answers
50
views
Can't stop java application wrapped as windows service using procrun
I am trying to wrap a java application as a windows service. I use procrun to do so and it works fairly good (I can install the service and start it, the application works fine), but when I try to ...
1
vote
1
answer
85
views
Confusion about thread synchronization
public class Interview implements Runnable {
int b = 100;
public synchronized void m1() throws Exception {
//System.out.println("-----");
b = 1000;
Thread....
- 13
0
votes
1
answer
48
views
why grpc java thread is blocked without any lock or synchronization syntax around the blocked line
At application startup, I've noticed an extreme delay in the initialization of my gRPC client stream. Through thorough examination via logs and jstack, I've identified that the 'grpc-default-executor-{...
- 43
0
votes
0
answers
15
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Adding pararelism to algorithm wator in java
I have a school project where they make me optimize alogrithms. The task is to add paralerism to the algorithm. I choose wator and I have to run using static decomposition of the matrix of cells with ...
- 1
1
vote
1
answer
34
views
How can I identify which code in my Android application initiates the creation of threads using the Android Profiler
I am working on a plugin-based application which has different plugins. Each plugin is independent of the others. I am also using the Google Places API as a plugin in it. There is an option to refresh ...
0
votes
0
answers
63
views
Exception in Execute Select java.lang.IllegalThreadStateException: Thread is already started
Getting Excpetion in Execute Select java.lang.IllegalThreadStateException: Thread is already started when we are trying to execute a select statement in a sql server through java below is the code ...
2
votes
1
answer
211
views
Spring @Async architecture for scheduled, long running api calls
I need to solve the following problem, described exemplary:
My Spring application checks every minute if there is a new job. If there is a job, it subtasks should be run in parallel. They are mostly ...
- 49
-1
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1
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131
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Function for making the code wait in javafx
Im new to using javaFx and programming in general so this might be a stupid question. Im trying to make a function that makes the thread wait without crashing the program which would result in ...
- 3
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0
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41
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How does the class Exchanger in Java actually work?
I'm still very new to how Threads work in Java and I got an assignment to recreate the Exchanger class based on its functionality.
I read the documentation and I understand what it is supposed to do, ...
- 87
0
votes
1
answer
25
views
JMeter threads hang in sockets and do not restart
I'm running JMeter tests. However, after some time, I encounter several errors:
Non HTTP response code: java.net.SocketTimeoutException
And after that, the threads do not restart, although it says ...
1
vote
0
answers
37
views
Can anything external to the JVM interrupt Process.waitFor()?
I've been using roughly the same utility code to handle executing an external Process for at least a decade. Recently a customer hit a case where the following ~code was interrupted:
try {
int ...
- 11