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Java deadlock with 1 bject1/13/2024 ![]() The following class extends Thread class and acquires locks on Person class followed by the Address class. This is the simple example and in an actual application there may be complex scenario where deadlock occurs. Now let’s see how deadlock occurs in the program. This is just an example and for actual application you have to find out your actual program to check the deadlock. Connect to the Local Process in New Connection window and click on Connect button. The jconsole.exe is found under the bin folder of JDK installation. ![]() This will print status of all threads and you can check which thread is locked on which object.Īnother option is to use jConsole/VisualVM, which comes with JDK. In Windows system you can do so by pressing Ctrl + Break from the command line tool. Even when running a simple program, a JVM will have several threads running, such as a finalizer thread, or for GUI applications, an event distribution thread (EDT). It's not entirely clear what you mean by 'system thread'. To take thread dump in Linux system you can execute command kill -3. It tries to take object lock of s1 and call method test1 but it is already acquired by t1, so it has to wait till t1 release the lock. It's correct that a single Java thread cannot deadlock against itself if only Java object monitor locks are involved. if you are trying to lock different objectĪnother way to find out deadlock using thread dump. ![]() check if are calling a synchronized method from another. ![]() The following points may give you ideas how to detect deadlock in application code: There are several ways you can detect deadlock in Java applications. Java provides built-in tools for detecting and analyzing deadlocks. Deadlock describes a situation where two or more threads are blocked forever, waiting for each other. Java deadlock situation arises with at least two threads(multitasking or multi-threading) and two or more resources. ![]()
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