This tutorial shows you how to create a Java web application with Visual Studio Code. You'll learn how to run, debug, and edit the Java web app locally and eventually on the cloud.
A simple Spring Boot Getting Started web app
Before running and deploying this sample, you must have the Java SE Development Kit (JDK) and Apache Maven build tools on your local development environment. If you don't have, please install them.
Download and install the Java SE Development Kit (JDK), version 8:
Note: The
JAVA_HOMEenvironment variable must be set to the install location of the JDK to complete this tutorial.
Download Apache Maven version 3 or greater:
Install Apache Maven for your local development environment:
Clone the Spring Boot Getting Started sample project to your local machine. You can clone a Git repository with the Git: Clone command in the Command Palette (⇧⌘P (Windows, Linux Ctrl+Shift+P)). Paste https://github.com/spring-guides/gs-spring-boot.git as the URL of the remote repository and then decide the parent directory under which to put the local repository. After that, open the cloned repository in VS Code by navigating to the repository folder and typing code ..
Note: You can install Visual Studio Code from https://code.visualstudio.com and Git from https://git-scm.com.
From within VS Code, navigate to the complete folder that contains the project which is ready to run. Open any of the Java files in the repository (for example complete\src\main\java\hello\Application.java). If you don't have the Java language extensions installed for VS Code, you will be prompted to install the Microsoft Java Extension Pack. Follow the instructions and reload VS Code after the installation.
Once you have the Java Extension Pack installed, it will automatically build the project for you (this may take several minutes). You can run the application within VS Code by pressing F5 and selecting the Java environment. The Java Debug extension will generate a debugging configuration file launch.json for you under a .vscode folder in your project. You can see build progress in the VS Code Status Bar and when everything is finished, the final active debug configuration is displayed.
You can learn more about how VS Code launches your application in Debugging Launch Configurations. Press F5 again to launch the debugger.
Test the web app by browsing to http://localhost:8080 using a web browser. You should see the following message displayed: "Greetings from Spring Boot!".
Let's now edit HelloController.java to change "Greetings from Spring Boot!" to something else like "Hello World". VS Code provides a great editing experience for Java, check out Editing and Navigating Code to learn about VS Code's editing and code navigation features.
Click the Restart button on the top of the editor to relaunch the app and see result by reloading the browser.
Set a breakpoint (F9) in the application source code, and reload your browser to hit the breakpoint.
If you would like to learn more about debugging Java with VS Code, you can read Java Debugging.
Congratulations, you have your first Spring Boot web app running locally! Read on to learn how to host it in the cloud.
We just built a Java web application and ran it locally. Now you will learn how to deploy from Visual Studio Code and run it on Azure in the cloud.
If you don't have an Azure subscription, you can sign up for a free Azure account. Create your free Azure account
The Azure App Service extension is used to create, manage, and deploy to Azure App Service with key features including:
To install the Azure App Service extension, open the Extensions view (⇧⌘X (Windows, Linux Ctrl+Shift+X)) and search for azure app service to filter the results. Select the Microsoft Azure App Service extension. For a more command-line Maven-centric experience, you can also check out the Maven plugin for Azure App Service Linux tutorial.
Once the extension is installed, you can take the following steps to create a new Web App.
Linux.Tomcat 8.5 (JRE8).
The deploy process leverages the Azure Account extension (installed along with the Azure Functions extension as a dependency) and you need to sign in with your Azure subscription. If you do not have an Azure subscription, sign up today for a free 30 day account and get $200 in Azure Credits to try out any combination of Azure services.
To sign in to Azure, run Azure: Sign In from the Command Palette (⇧⌘P (Windows, Linux Ctrl+Shift+P)). You can then sign in to your account using the Device Login flow. Select Copy & Open to open your default browser.
Paste in the access code and continue the sign in process.
Once you have signed in, you can open the command prompt or terminal window and build the project using Maven commands. This will generate a new name.war or name.jar file in the target directory.
mvn clean packageAfter building the project, open the target directory in VS Code Explorer. Right-click on the name.war or name.jar file and choose Deploy to Web App, and follow the prompts to choose the Web App for your deployment.
Open the Output window in VS Code to view the deployment logs. Once the deployment is completed, it will print out the URL for your Web App. Click the link to open it in a browser, you can see the web app running on Azure!
Note: For more advanced features of App Service, you can check out the Azure App Service extension.
Azure Cosmos DB is a globally distributed database service that allows developers to work with data using a variety of standard APIs, such as SQL, MongoDB, Cassandra, Graph, and Table.
The Spring Boot Starter makes it easy to store data in and retrieve data from your Azure Cosmos DB with SQL API.
You can start from the Spring Data Azure Cosmos DB Sample Project.
Navigate to src/main/resources and open application.properties. Replace below properties in application.properties with information of your database.
azure.documentdb.uri=your-documentdb-uri
azure.documentdb.key=your-documentdb-key
azure.documentdb.database=your-documentdb-databasenameYou can press F5 to run your application. To check the result, open Azure portal and access your Cosmos DB. Click Data Explorer, and next choose Documents. You will see data being shown if it is successfully written into Cosmos DB. You can also browse your data entries in Cosmos DB with Azure Cosmos DB Extension.
After setting a breakpoint (F9) in your source code, refresh your browser to hit the breakpoint. Details about debugging can be found in Java Debugging
Alternatively, you can also use Maven to package and run your project as steps below:
Navigate to the directory azure-spring-boot and run the command.
mvn installNavigate to the directory azure-documentdb-spring-boot-sample and run the command.
mvn package
java -jar target/azure-documentdb-spring-boot-sample-0.0.1-SNAPSHOT.jar