How to Run a Spring Boot Application in Visual Studio Code

Spring Boot is a powerful framework for building Java-based applications, while Visual Studio Code (VS Code) is a lightweight yet powerful editor for code writing and debugging. Once you've finished coding your Spring Boot project, here's a complete guide on how to successfully run it in VS Code.

Prerequisites

Before you begin, make sure you have the following installed:

• Java Development Kit (JDK) : version 8 or higher.
• Apache Maven or Gradle: depends on your project build tool.
• Spring Boot CLI (optional): for additional Spring Boot functionality.
• Visual Studio Code Extension:
  • Java Extension Pack (or individual extensions such as Java language support, Java debugger and Maven/Gradle support provided by Red Hat).
  • Spring Boot Extension Pack (optional for Spring-specific tools).

Step 1: Open your project in VS Code

1. Launch Visual Studio Code.
2. Open the folder using File > Navigate to your Spring Boot project directory.
3. Make sure your pom.xml (Maven) or build.gradle (Gradle) file is in the root of your project.

Step 2: Build your project

Before running the application, build the project to ensure it compiles without errors.

For Maven projects:

Open the integrated terminal in VS Code (Ctrl `) and run: bash mvn clean install

For Gradle projects:

Run: bash ./gradlew build

Step 3: Configure startup settings (optional)

To make it easier to run or debug your app in VS Code, set a launch configuration:

1. Open the Run and Debug menu (shortcut key: Ctrl Shift D).
2. Click to create the launch.json file .
3. Select Java as the environment.
4. Add the following configuration (replace com.example.Application with your main class): json

   {
   "type": "java",
   "request": "launch",
   "name": "启动Spring Boot",
   "mainClass": "com.example.Application",
   "projectName": "your-project-name"
   }

Step 4: Run your application

There are several ways to run Spring Boot applications in VS Code:

Method 1: Run from the main class

1. Open the main class (the one annotated with @SpringBootApplication).
2. Click the Run button (green play icon) above the main method.
3. Alternatively, right-click anywhere in the file and select Run Java.

Method 2: Use the command panel

1. Open the Command Palette (Ctrl Shift P or Cmd Shift P on macOS).
2. Type and select Java: Run Main Class .
3. Select the main class of your Spring Boot application.

Method 3: Run from terminal

You can also run the application directly using the project's build tools:

• For Maven: bash mvn spring-boot:run
• For Gradle: bash ./gradlew bootRun

Step 5: Access your application

After the application starts, look for log messages indicating that the server is running, for example:

Tomcat started on port(s): 8080 (http)

Open a browser and visit http://localhost:8080 (or the port specified in the application properties) to view your Spring Boot application.

Step 6: Debug your application (optional)

If you want to debug a Spring Boot application:

1. Add a breakpoint by clicking next to the line number.
2. Start debugging by selecting Run > or pressing F5.
3. Use the debug console and variables panel in VS Code to inspect the status of your application.

Troubleshooting Tips

If you are having trouble running your Spring Boot application, consider the following tips:

• Enable verbose error reporting: Add the following to your terminal to see detailed errors: bash export JAVA_TOOL_OPTIONS="-Dfile.encoding=UTF-8"
• Verify dependencies: Make sure all required dependencies are correctly listed in your pom.xml or build.gradle file.
• Check for port conflicts: Make sure the port (default: 8080) is not in use.

Conclusion

With the right setup, running Spring Boot applications in Visual Studio Code is very simple. By following this guide, you can build, run, and debug your applications efficiently. VS Code’s lightweight environment and its powerful extensions make it an excellent choice for Spring Boot development.

Thank you for reading… Happy coding!

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