Once you have your StackWalker you can access the stack information using the following methods. The different calls allow you to specify one option or a set of them as well as the estimated size of the number of frames to capture – I will discuss both further below. of (RETAIN_CLASS_REFERENCE, SHOW_HIDDEN_FRAMES ) ) StackWalker stackWalker4 = StackWalker. ![]() getInstance (RETAIN_CLASS_REFERENCE ) StackWalker stackWalker3 = StackWalker. getInstance ( ) StackWalker stackWalker2 = StackWalker. Getting a StackWalkerĪ StackWalker is easily accessible with the static getInstance methods: StackWalker stackWalker1 = StackWalker. We will now see how to get an instance and how to use it to execute a simple stack walk. Java 9 ships with a new type, the StackWalker, which gives access to the stack. We will now explore the different functionalities of the API followed by a look at its performance characteristics. To address those drawbacks Java 9 introduces the new stack-walking API (with JEP 259). To get the class you need to extend SecurityManager that has a protected method getClassContext that will return an array of Class. It captures all the frames – except the hidden ones – even if you need only the first 2 and does not give you access to the actual Class instance in which the method is declared. This works but it is quite costly and hacky. StackTraceElement stackTrace = new Throwable ( ). Every method call creates a frame on the stack and Java allows code to access the stack, so it can analyze it.īefore Java 9, the way most people would access the stack information was via instantiating a Throwable and use it to get the stack trace. For example, to do security checks or to identify the source of a resource leak. There are situations when you need to know who called your method. ![]() This article requires working knowledge of Java, particularly lambda expressions and streams. (The execution stack represents the chain of method calls – it starts with the public static void main(String) method or the run method of a thread, contains a frame for each method that was called but did not yet return, and ends at the execution point of the StackWalker call.) In this article we will explore the different functionalities of the stack-walking API, followed by a look at its performance characteristics. The stack-walking API, released as part of Java 9, offers an efficient way to access the execution stack. Why Taking a Function Instead of Just Returning the Stream?.
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