#Deadlock in java how toHere I have written a simple program that will cause java deadlock scenario and then we will see how to analyze it. Java deadlock situation arises with at least two threads and two or more resources. We will get the below output when the program runs.Deadlock in java is a programming situation where two or more threads are blocked forever. Here, ‘join()’ method is called on the current thread, so the current thread is waiting to complete its execution only. When the above program runs, it prints “Begin – Thread” and in the next step, join() is called on the current thread only. Deadlock Deadlock describes a situation where two or more threads are blocked forever, waiting for each other. See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases. The above program compiles without any error but arises into a Deadlock situation. See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases. While working with ‘Thread.join()’ method, we need to handle the Interrupted exception either using try/catch block or throws declaration as it is a checked exception. If a thread wants to wait until another thread is completed its execution, this ‘join()’ method will be called. The caller thread will be block indefinitely if the thread does not terminate. Thread join(): The ‘join()’ method is a synchronization method that blocks the calling thread i.e., the thread that calls this method until the thread whose join() method is called has completed. One more crucial thing to note down in output was ' has ENDED' was never printed in output, because of deadlock Thread-1 & Thread-2 never ended. Now, we are getting that ‘currentThread()’ that is created and we are calling the ‘join()’ method on it. Deadlock in java is a programming situation where two or more threads are blocked forever. What happened in above program was Thread-1 was waiting for Thread-2 to release lock on Object.class and Thread-2 was waiting for Thread-1 to release lock on String.class and deadlock was formed. In ‘ThreadTest.java’ class, when the main method executes a thread will be created internally. A single-threaded application can produce deadlock, In simple words, deadlock means some action waiting for other activities to complete. By this above definition, to arise a deadlock situation, we need threads or processes, but can we produce a deadlock using a single thread? The answer is YES. This type of deadlock commonly happens in multi-threaded applications. The Java Thread Analyzer detects these deadlocks that are caused by the inappropriate use of mutual exclusion locks. A deadlock occurs when two or more threads wait forever for a.
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