2/20/2024 0 Comments Java deadlock prevention example![]() ("Aquired lock on Integer.class object") * This method request two locks, first String and then Integer ![]() * Java program to create a deadlock by imposing circular wait. Once you answer the earlier question, they may ask you how to write code that will result in a deadlock in Java. Write a Java Program That Will Result in Deadlock This is an advanced practice course to learn more about Java thread dump and familiarize you with other popular advanced troubleshooting tools. If you are interested in learning about troubleshooting tools and the process to analyzing your thread dump, I suggest you take a look at this Analyzing Java Thread Dumps course on Pluralsight by Uriah Levy. It will show you exactly which threads are getting locked and on which object. You can analyze that thread dump with using tools like fastthread.io, which allows you to upload your thread dump and analyze it.Īnother way is to use the jConsole/VisualVM. ![]() If this happens, try to take a thread dump, in Linux you can do this by the command "kill -3." This will print the status of all threads in an application log file, and you can see which thread is locked on which object. If that is the case, there is a good chance of deadlock, if the developer is not careful.Īnother way to determine deadlock risks is when you actually get dead-locked while running the application. Though this could have many answers, first, I would look at the code to see if a nested synchronized block is calling a synchronized method from another or if it is trying to get a lock on a different object. It will only happen in the case of multitasking or multi-threading. So, what is a deadlock? The answer is simple - when two or more threads are waiting for each other to release the resource they need (lock) and get stuck for infinite time, the situation is called deadlock. Even though the question looks very basic, most of the Java developers get stuck once you start going deeper. Want to learn how to avoid deadlock in Java? The question of avoiding deadlock is one of the popular Java interview questions, with multi-threading being asked mostly at a senior level interview with lots of follow up questions.
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