There are many options and settings available to configure the debugger. With this feature, you can configure the packages to filter within your launch.json so they could be skipped when you step through. Step filter is supported by the extension to filter out types that you do not want to see or step through while debugging. auto - Automatically apply the changes after compilation.manual - Click the toolbar to apply the changes (default).You may use the debug setting to control how to trigger Hot Code Replace. Below is an illustration of how you can use HCR with Debugger for Java in VS Code. No restart is required, which is why it's called "hot". With this new feature, you can start a debugging session and change a Java file in your development environment, and the debugger will replace the code in the running JVM. HCR facilitates experimental development and fosters iterative trial-and-error coding. Hot Code Replace (HCR) is a debugging technique whereby the Debugger for Java transmits the class changes over the debugging channel to another Java Virtual Machine (JVM). Hot Code ReplaceĪnother advanced feature the debugger supports is 'Hot Code' replacement. The debugger also lets you evaluate expressions in the WATCH window as well as the Debug Console. They're different from breakpoints because they don't stop the execution flow of your application. Logpoints allow you to send output to Debug Console without editing code. Logpoints is also supported by Java Debugger. You can then pick a field in the VARIABLES view and set a data breakpoint. This means you need to launch your application and break on a regular breakpoint first. Note that the data breakpoint can only be set inside a debug session. You can have the debugger break when a variable changes its value. You can set your breakpoint to break when expression evaluates to true. With the help of expression evaluation, the debugger also supports conditional breakpoint. The Debugger for Java supports various breakpoints, such as line breakpoints, conditional breakpoints, data breakpoints, logpoints. You can also use the user setting to configure a global console for all Java debug sessions. If your program need inputs from a terminal, you can use the Integrated Terminal ( ⌃` (Windows, Linux Ctrl+`)) within VS Code or an external terminal to launch it. The default Debug Console in VS Code doesn't support inputs. In addition to support for debugging Java projects managed by build tools, VS Code also supports for debugging single Java files without any project. You can also start a debugging session from the Run and Debug view from the side bar of VS Code. Pressing F5, the debugger will automatically find the entry point of your project and start debugging. You will find Run|Debug on the CodeLens of your main() function.Īnother way to start debugging is to select Run Java or Debug Java menu from the top editor title bar. The debugger extension provides multiple ways to run and debug your Java application. vscode folder in your workspace (project root folder).įor more details on how to create the launch.json, read Launch configurations for more details on configuration options for Java, you can read Configuration options. If you would like to customize and persist your launch configuration, you can select the create a launch.json file link in the Run and Debug view. Configureīy default, the debugger will run out-of-box by automatically finding the main class and generating a default launch configuration in memory to launch your application. To get the complete Java language support in Visual Studio Code, you can install the Extension Pack for Java, which includes the Debugger for Java extension.įor details on how to get started with the extension pack, you can review the Getting Started with Java tutorial. If you run into any issues when using the features below, you can contact us by entering an issue. Java Debug Server for Visual Studio Code.The Java debugger is an open-source project, which welcomes contributors to collaborate through GitHub repositories: Here's a list of supported debugging features: It's a lightweight Java debugger based on Java Debug Server, which extends the Language Support for Java™ by Red Hat. Visual Studio Code allows you to debug Java applications through the Debugger for Java extension. Configure IntelliSense for cross-compiling.
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