Java keep main thread alive. setDaemon(true) before calling th. In Java, when the main method completes its execution, the Java Virtual Machine (JVM) terminates unless there are non-daemon threads still running. Thanks in advance. Jul 23, 2023 · Java is pretty amazing. getState() and interesting information about Thread States suggested by @Marou Maroun. The ThreadPoolExecutor class, part of Java’s java. In Java programming, it's common to need to manage thread execution in a way that keeps the main thread alive while other tasks are being performed. I could definitely do that by running Tomcat process but why not we simply create a Java Program which runs forever. The JVM exists if no more non-daemon threads are running. Today I had a scenario in which I needed to have my program running forever. Each part of such a program is called a thread, and each thread defines a separate path of execution. It's often not needed except in simple examples. Note you cannot restart threads, once the run method has returned the thread is reclaimed by the system. Aug 30, 2012 · 17 Leaving the main method in Java does not automatically end the program. By default the only non-daemon thread is the main thread and it ends when you leave the main method, therefore stopping the JVM. Multithreading in Java In the Java language, multithreading is driven by the core concept of a Thread. it is a listener it gets notified when someone sends message so how do i keep it running ? The Listener Class public class MyListnerImpl implements Listener { Mar 21, 2025 · The isAlive() method of thread class tests if the thread is alive. With list of thousands of APIs and utilities you could create any types of tutorials. lang. If using the Java DSL, I'd just throw the following on to the end of my route: So yes, a thread is "alive" when its run() method is still ongoing, but it is also "alive" in the time window between the invocation of start() and the implicit invocation of the run() method by the JVM. You can also check the Thread. Jan 18, 2022 · The role of Gst. Life Cycle of a Thread in Java The java. Sep 21, 2021 · Java provides built-in support for multithreaded programming. Mar 3, 2013 · I'd like to force the main Camel thread to stay alive for, say, 60 seconds, to see if I can at least rule it out as a factor. Therefore, to keep threads alive after the main method exits, you need to use daemon threads or prevent the application from exiting by leveraging certain synchronization mechanisms. Wanted to check upstart script in Ubuntu OS. During their lifecycle, threads go through various states: 3. main () is solely to keep the main thread alive if you need it, as threads inside GStreamer don't count from a JVM perspective. sleep () and CountDownLatch. start(). A multi-threaded program contains two or more parts that can run concurrently. When a Java program starts up, one thread begins running immediately. This is usually called the main thread of our program because it is the one that is May 30, 2025 · A thread pool manages a pool of worker threads to execute tasks concurrently, reducing the overhead of creating and destroying threads. A thread is considered alive when the start() method of thread class has been called and t Feb 12, 2012 · You just create a thread and call th. . Edit: The above answers the question "how to create a daemon thread", but (as the scope of the question has changed), a proper answer would be: don't create a daemon thread if you want your thread to keep the JVM from exiting once the main thread completed. util Jan 8, 2024 · 2. Two primary methods to achieve this are using Thread. Thread class contains a static State enum – which defines its potential states. Oct 22, 2013 · Please tell me how to keep that thread alive and also please throw some light on how to implement the Spring TaskExecutor to achieve same. If you need more control over your threads you could create separate Worker and ThreadManager classes. kcdycn hqeb mcydd jwch xuek rayg syy rzcfht eeya vgjwhsb