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Table of contents

The continuation of JavaWorld's most popular long-running series, featuring new and classic Java programming tips from your peers in the Java developer community. Android Studio for beginners. By Jeff Friesen Follow. Tutorial series: Android Studio for beginners. Cool Tools. Design Techniques. Distributed Objects. Dustin's Software Development Cogitations and Speculations. JavaScript objects from a Java developer's perspective.

How-to Java. Secure your Java apps from end to end, Part 2. Java Navigation component. Intents and intent filters. User interface. Add motion to your layout with MotionLayout.

Game developers have a voice.

MotionLayout XML reference. Improving layout performance. Custom view components. Look and feel. Add the app bar. Control the system UI visibility. Supporting swipe-to-refresh. Pop-up messages overview. Adding search functionality. Creating backward-compatible UIs. Media app architecture. Building an audio app. Building a video app. Routing between devices. Background tasks. Sending operations to multiple threads. Manage device awake state. Save to shared storage. Save data in a local database. Sharing simple data. Sharing files. Sharing files with NFC.

Printing files. Content providers.

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Autofill framework. Contacts provider. Data backup. Back up key-value pairs. Remember and authenticate users. User location.

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Using touch gestures. Handling keyboard input. Supporting game controllers. Input method editors. Performing network operations. Transmit network data using Volley. Perform network operations using Cronet. Transferring data without draining the battery. Reduce network battery drain. The second line represents the current state of the thread. The possible states for a thread are captured in the Thread. The next section contains the stack trace for the thread at the time of the dump.

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This stack trace resembles the stack trace printed when an uncaught exception occurs and simply denotes the class and line that the thread was executing when the dump was taken. This supplemental lock information is important when diagnosing deadlocks, as we will see in the following sections. The last portion of the thread information contains a list of synchronizers objects that can be used for synchronization, such as locks that are exclusively owned by a thread. According to the official Java documentation, "an ownable synchronizer is a synchronizer that may be exclusively owned by a thread and uses AbstractOwnableSynchronizer or its subclass to implement its synchronization property.

ReentrantLock and the write-lock but not the read-lock of ReentrantReadWriteLock are two examples of ownable synchronizers provided by the platform. For more information on locked ownable synchronizers, see this Stack Overflow post.

The next section of the thread dump contains the JVM-internal non-application threads that are bound to the OS. Since these threads do not exist within a Java application, they do not have a thread ID. These threads are usually composed of GC threads and other threads used by the JVM to run and maintain a Java application:. These references may cause memory leaks under certain circumstances and are not automatically garbage collected. For many simple issues, this information is unused, but it is important to understand the importance of these global references.

Step 1: Set up, Installation, and Output Console

For more information, see this Stack Overflow post. The final section of the thread dump contains information about discovered deadlocks. Since our application was designed with a deadlock, the thread dump correctly captures this contention with the following message:. This circular dependency is the textbook definition of a deadlock contrived by our application and is illustrated in the figure below:. In addition to the description of the deadlock, the stack trace for each of the threads involved is printed in the second subsection.

This allows us to track down the line and locks the objects being used as monitor locks in this case that are causing the deadlock. For example, if we examine line 34 of our application, we find the following content:. If we do this, we end up with the following application:. In summary, using only the information provided in the thread dump, we can find and fix a deadlocked application.

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Although this inspection technique is sufficient for many simple applications or applications that have only a small number of deadlocks , dealing with more complex thread dumps may need to be handled in a different way. When handling production applications, thread dumps can become overwhelming very quickly. A single JVM may have hundreds of threads running at the same time and deadlocks may involve more than two threads or there may be more than one concurrency issue as a side-effect of a single cause and parsing through this firehose of information can be tedious and unruly.

These tools parse Java thread dumps display otherwise confusing information in a manageable form commonly with a graph or other visual aid and may even perform static analysis of the dump to discover issues. While the best tool for a situation will vary by circumstance, some of the most common TDAs include the following:. While this is far from a comprehensive list of TDAs, each performs enough analysis and visual sorting to reduce the manual burden of decyphering thread dumps.

Thread dumps are an excellent mechanism for analyzing the state of a Java application, especially a misbehaving, multithreaded application, but without proper knowledge, they can quickly add more confusion to an already difficult problem.

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In this article, we developed a deadlocked application and generated a thread dump of the stuck program. Upon analyzing the dump, we found the root cause of the deadlock and fixed it accordingly. This is not always so easy, and for many production applications, the help of a TDA may be required.