![]() ![]() Top 10 Applications of Java Programming LanguageĤ9. Top MVC Interview Questions and Answers You Need to KnowĤ1. Palindrome in Java- How to check a number or string?Ĥ0. This usually happens when multiple threads need the same. What is the difference between C, C++, and Java?ģ9. Deadlock in Java is a condition where two or more threads are blocked forever, waiting for each other. Top 50 Java Collections Interview Questions You Need to Knowģ8. Thread-1 already holds a lock on obj1 and for further processing it needs a lock on obj2. To describe it in a simple manner lets assume there are two threads Thread-1 and Thread-2 and two objects obj1 and obj2. What is the concept of String Pool in Java?ģ6. What is deadlock, Deadlock in multi-threading describes a situation where two or more threads are blocked forever, waiting for each other. Java Collections Interview Questions and Answersģ5. Top Data Structures & Algorithms in Javaģ4. Library Management System Project in JavaĢ8. Dependency Injection Using Spring BootĢ5. A Java multithreaded program may suffer from the deadlock condition because the synchronized keyword causes the executing thread to block while waiting for the lock, or monitor, associated with the specified object. If you wish to check out more articles on the market’s most trending technologies like Artificial Intelligence, DevOps, Ethical Hacking, then you can refer to Edureka’s official site.ĭo look out for other articles in this series which will explain the various other aspects of Java.ġ6. Deadlock occurs when multiple threads need the same locks but obtain them in a different order. ![]() I hope you are clear with all that has been shared with you in this tutorial. This brings us to the end of this article where we have learned about the deadlock in Java and how to avoid it. In this case, we can use Thread.join with a maximum time that a thread will take. Using Thread Join - A deadlock usually happens when one thread is waiting for the other to finish.Giving locks to the unnecessary threads that cause the deadlock condition. Avoid Unnecessary Locks - The locks should be given to the important threads.It normally happens when you give locks to multiple threads. Avoid Nested Locks - You must avoid giving locks to multiple threads, this is the main reason for a deadlock condition.Output: Thread 1: Locked r1 Thread 2: Locked r2 How To Avoid Deadlock in Java?Īlthough it is not completely possible to avoid deadlock condition, but we can follow certain measures or pointers to avoid them: For example, instead of using synchronized ArrayList use the ConcurrentLinkedQueue.Deadlock Example public class Example And it is recommended to use a lock-free data structure and If it is possible to keep your code free from locks. Avoiding unnecessary Locks: We should use locks only for those members on which it is required, unnecessary use of locks leads to a deadlock situation.It notably occurs with the synchronized keyword, but its liable to occur with locks, Semaphores, blocking queues. Use Lock Ordering: We have to always assign a numeric value to each lock and before acquiring the lock with a higher numeric value we have to acquire the locks with a lower numeric value. Deadlock can occur with any locking primitive.Then our thread has to wait for another thread to finish, it is always best to use Thread.join() method with the maximum time you want to wait for the thread to finish. Using Thread.join() Method: We can get a deadlock if two threads are waiting for each other to finish indefinitely using thread join.We can avoid Deadlock situation in the following ways: Due to this while using synchronized keyword we have to take special care. Hence, synchronized keyword is one of the major reason for deadlock situation. In the above program if we removed at least one synchronized keyword then the program won’t enter into the deadlock situation. Here the cursor is showing forever because the threads enter into the deadlock situation. Object Oriented Programming (OOPs) Concept in Java.Split() String method in Java with examples.Producer-Consumer solution using threads in Java.2 - Run the jstack command with the pid as argument. ![]() 1 - By using jps command I can get the pid of the Java application.
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