#JAVA DEADLOCK WITH 1 BJECT CODE#
Once you answer the earlier question, they may ask you how to write code that will result in a deadlock in Java. Description Wikipedia aptly defines deadlock is a situation in which two or more competing actions are each waiting for the other to finish, and thus neither ever does. It will show you exactly which threads are getting locked and on which object. 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.Īnother way is to use the jConsole/VisualVM. 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. Two (or more) threads alter the state of a shared resource concurrently, leaving it in an unpredictable state. first, we will 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. Two threads hold locks on different resources, each waiting indefinitely for the other to release its lock. There are several ways to define the Deadlock in java. Basically, a deadlock occurs when multiple threads request for the same resource but they are received in a different order.Įventually, they get stuck for an infinite period of time and cause a deadlock.
So, the deadlock condition arises when there are more than two threads and two or more than two resources.
Then these threads can never access the resource and eventually go into the waiting state forever. Because every object in Java has a lock implicitly associated with it. Even though the question looks very basic, most of the Java developers get stuck once you start going deeper.ģ) Write a Java Program That Will Result in Deadlockĭeadlock in Java is a condition when two or more threads try to access the same resources at the same time. You can also have deadlock without using any locks.
#JAVA DEADLOCK WITH 1 BJECT HOW TO#
In this article, we will learn how to avoid deadlock in Java? The question of avoiding deadlock is one of the popular Java Interview questions which mostly asked to experience developer, with multi-threading being asked mostly at a senior level interview with lots of follow up questions.
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