Add Java Spring Boot Guide (#583)

* Add Spring Boot Guide

* Added feedback

* Add link to new template

src/data/sidebar.ts

@@ -55,6 +55,7 @@ export const sidebarContent: ISidebarContent = [
           makePage("Remix", "guides"),
           makePage("Vue", "guides"),
           makePage("Nuxt", "guides"),
+          makePage("Spring Boot", "guides"),
           makePage("Astro", "guides")
         ],
       },

src/docs/guides/languages-frameworks.md

@@ -18,6 +18,8 @@ Learn how to deploy your apps quickly on Railway using your preferred languages
     - [Django](/guides/django)
 ### PHP
     - [Laravel](/guides/laravel)
+### Java
+    - [Spring Boot](/guides/spring-boot)
 ### Go
     - [Gin](/guides/gin)
 ### Ruby

src/docs/guides/spring-boot.md

@@ -0,0 +1,186 @@
+---
+title: Deploy a Spring Boot App
+---
+
+[Spring Boot](https://spring.io/projects/spring-boot) is a Java framework designed to simplify the creation of stand-alone, production-ready Spring applications that are easy to run right out of the box.
+
+This guide covers how to deploy a Spring Boot app to Railway in four ways:
+
+1. [One-click deploy from a template](#one-click-deploy-from-a-template).
+2. [From a GitHub repository](#deploy-from-a-github-repo).
+3. [Using the CLI](#deploy-from-the-cli).
+4. [Using a Dockerfile](#use-a-dockerfile).
+
+Now, let's create a Spring Boot app!
+
+## Create a Spring Boot App
+
+**Note:** If you already have a Spring Boot app locally or on GitHub, you can skip this step and go straight to the [Deploy Spring Boot App to Railway](#deploy-the-spring-boot-app-to-railway).
+
+To create a new Spring Boot app, ensure that you have [JDK](https://www.oracle.com/java/technologies/downloads/) installed on your machine.
+
+Go to [start.spring.io](https://start.spring.io) to initialize a new Spring Boot app. Select the options below to customize and generate your starter app.
+
+- Project: Maven
+- Language: Java
+- Spring Boot: 3.3.4
+- Project Metadata:
+    - Group: com.railwayguide
+    - Artifact: helloworld
+    - Name: helloworld
+    - Description: Demo project for Railway Guide
+    - Package name: com.railwayguide.helloworld
+    - Packaging: jar
+    - Java: 17
+- Dependencies: 
+    - Click the **Add Dependencies** button and search for **Spring Web**. Select it.
+
+![Spring Boot App Initializer](https://res.cloudinary.com/railway/image/upload/v1729619101/springboot_app_on_railway.png)
+_Config to initialize our new app_
+
+Now, click on the **Generate** button, download the zipped file and unpack it into a folder on your machine. 
+
+### Modify the Application File
+
+Next, open the app in your IDE and navigate to the `src/main/java/com/railwayguide/helloworld/HelloWorldApplication.java` file.
+
+Replace the content with the code below:
+
+```java
+package com.railwayguide.helloworld;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+@RestController
+public class HelloworldApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(HelloworldApplication.class, args);
+	}
+
+	@GetMapping("/")
+    public String hello() {
+      return String.format("Hello world from Java Spring Boot!");
+    }
+
+}
+```
+
+We added a `hello()` method that returns the response: `Hello world from Java Spring Boot!`.
+
+The `@RestController` annotation designates this class as a web controller, while `@GetMapping("/")` maps the `hello()` method to handle requests sent to the root URL, `/`.
+
+### Run the Spring Boot App locally
+
+Next, `cd` into the `helloworld` directory via the terminal and run the following Maven command:
+
+```bash
+./mvnw spring-boot:run
+```
+
+**Note:** This is a Maven wrapper for Linux and macOS, which uses a bundled version of Maven from **.mvn/wrapper/maven-wrapper.jar** instead of relying on the system-installed version.
+
+Open your browser and go to `http://localhost:8080` to see your app.
+
+## Deploy the Spring Boot App to Railway
+
+Railway offers multiple ways to deploy your Spring Boot app, depending on your setup and preference. 
+
+### One-Click Deploy from a Template
+
+If you’re looking for the fastest way to get started, the one-click deploy option is ideal. 
+
+Click the button below to begin:
+
+[![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/new/template/-NFGrr)
+
+We highly recommend that [you eject from the template after deployment](/guides/deploy#eject-from-template-repository) to create a copy of the repo on your GitHub account.
+
+**Note:** You can also choose from a <a href="https://railway.app/templates?q=spring boot" target="_blank">variety of Spring Boot app templates</a> created by the community.
+
+### Deploy from the CLI
+
+1. **Install the Railway CLI**:
+    - <a href="/guides/cli#installing-the-cli" target="_blank">Install the CLI</a> and <a href="/guides/cli#authenticating-with-the-cli" target="_blank">authenticate it</a> using your Railway account.
+2. **Initialize a Railway Project**:
+    - Run the command below in your Spring Boot app directory. 
+        ```bash
+        railway init
+        ```
+    - Follow the prompts to name your project.
+    - After the project is created, click the provided link to view it in your browser.
+3. **Deploy the Application**:
+    - Use the command below to deploy your app:
+        ```bash
+        railway up
+        ```
+    - This command will scan, compress and upload your app's files to Railway. You’ll see real-time deployment logs in your terminal.
+    - Once the deployment completes, go to **View logs** to check if the service is running successfully.
+5. **Set Up a Public URL**:
+    - Navigate to the **Networking** section under the [Settings](/overview/the-basics#service-settings) tab of your new service.
+    - Click [Generate Domain](/guides/public-networking#railway-provided-domain) to create a public URL for your app.
+
+<Image src="https://res.cloudinary.com/railway/image/upload/f_auto,q_auto/v1729621960/springboot_service_on_railway.png"
+alt="screenshot of the deployed Spring Boot service"
+layout="responsive"
+width={2172} height={1590} quality={100} />
+
+### Deploy from a GitHub Repo
+
+To deploy a Spring Boot app to Railway directly from GitHub, follow the steps below:
+
+1. **Create a New Project on Railway**:
+    - Go to <a href="https://railway.app/new" target="_blank">Railway</a> to create a new project.
+2. **Deploy from GitHub**: 
+    - Select **Deploy from GitHub repo** and choose your repository.
+        - If your Railway account isn’t linked to GitHub yet, you’ll be prompted to do so.
+3. **Deploy the App**: 
+    - Click **Deploy** to start the deployment process.
+    - Once the deployed, a Railway [service](/guides/services) will be created for your app, but it won’t be publicly accessible by default.
+4. **Verify the Deployment**:
+    - Once the deployment completes, go to **View logs** to check if the server is running successfully.
+
+    **Note:** During the deployment process, Railway will automatically [detect that it’s a Java app](https://nixpacks.com/docs/providers/java).
+5. **Set Up a Public URL**:
+    - Navigate to the **Networking** section under the [Settings](/overview/the-basics#service-settings) tab of your new service.
+    - Click [Generate Domain](/guides/public-networking#railway-provided-domain) to create a public URL for your app.
+
+### Use a Dockerfile
+
+1. Create a `Dockerfile` in the `helloworld` or Spring Boot app's root directory.
+2. Add the content below to the `Dockerfile`:
+    ```bash
+    # Use the Node alpine official image
+    # https://hub.docker.com/_/eclipse-temurin
+    FROM eclipse-temurin:21-jdk-alpine
+
+    # Create and change to the app directory.
+    WORKDIR /app
+
+    # Copy local code to the container image.
+    COPY . ./
+
+    # Build the app.
+    RUN ./mvnw -DoutputFile=target/mvn-dependency-list.log -B -DskipTests clean dependency:list install
+
+    # Run the app by dynamically finding the JAR file in the target directory
+    CMD ["sh", "-c", "java -jar target/*.jar"]
+    ```
+4. Either deploy via the CLI or from GitHub.
+
+Railway automatically detects the `Dockerfile`, [and uses it to build and deploy the app.](/guides/dockerfiles)
+
+**Note:** Railway supports also <a href="/guides/services#deploying-a-public-docker-image" target="_blank">deployment from public and private Docker images</a>.
+
+This guide covers the main deployment options on Railway. Choose the approach that suits your setup, and start deploying your Spring Boot apps seamlessly!
+
+## Next Steps
+
+Explore these resources to learn how you can maximize your experience with Railway:
+
+- [Add a Database Service](/guides/build-a-database-service)
+- [Monitor your app](/guides/monitoring)