javalin sample

Author: Chrisyhjiang

samples/javalin/README.md

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+# Javalin Sample
+
+This sample demonstrates how to deploy a very basic Javalin sample with Defang. The sample simply outputs "Defang x Javalin" on the webpage.
+
+## Prerequisites
+
+1. Download [Defang CLI](https://github.com/DefangLabs/defang)
+2. (Optional) If you are using [Defang BYOC](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-configure.html) authenticated with your AWS account
+3. (Optional - for local development) [Docker CLI](https://docs.docker.com/engine/install/)
+
+## Deploying
+
+1. Open the terminal and type `defang login`
+2. Type `defang compose up` in the CLI.
+3. Your app will be running within a few minutes.
+
+## Development
+
+For development, we use a local container. This can be seen in the compose.yaml document. To make changes to this sample, make sure that you have `openjdk@17` and `maven` installed. To run the sample locally after cloning the repository, you can run it on Docker by using the following command:
+
+1. Navigate to the `app` directory and build the project:
+
+   ```bash
+   cd app
+   mvn clean package
+   cd ../
+   ```
+
+2. From the project root directory, run:
+
+   ```bash
+   docker compose up --build
+   ```
+
+---
+
+Title: Javalin
+
+Short Description: A short hello world application demonstrating how to deploy Javalin onto defang.
+
+Tags: Javalin & Java & Maven
+
+Languages: java, javalin

samples/javalin/app/Dockerfile

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+# Use a base image with OpenJDK
+FROM openjdk:17-jdk-slim
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the compiled Java classes and resources to the container
+COPY target/defang-javalin-1.0-SNAPSHOT.jar /app/app.jar
+
+# Expose the port Javalin will run on
+EXPOSE 7000
+
+# Command to run the Javalin application
+CMD ["java", "-jar", "/app/app.jar"]

samples/javalin/app/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://www.maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.defang</groupId>
+    <artifactId>defang-javalin</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.javalin</groupId>
+            <artifactId>javalin</artifactId>
+            <version>4.6.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>1.7.31</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <outputDirectory>${project.basedir}/target</outputDirectory>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <includes>
+                    <include>**/*</include>
+                </includes>
+            </resource>
+        </resources>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+                <configuration>
+                    <source>17</source>
+                    <target>17</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.2.4</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <createDependencyReducedPom>false</createDependencyReducedPom>
+                            <transformers>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>App</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

samples/javalin/app/src/main/java/App.java

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+import io.javalin.Javalin;
+
+public class App {
+    public static void main(String[] args) {
+        Javalin app = Javalin.create(config -> {
+            config.addStaticFiles("/public", io.javalin.http.staticfiles.Location.CLASSPATH);
+        }).start(7000);
+
+        app.get("/", ctx -> {
+            ctx.contentType("text/html");
+            ctx.result(App.class.getResourceAsStream("/public/index.html"));
+        });
+    }
+}

samples/javalin/app/src/main/resources/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Defang x Javalin</title>
+</head>
+<body>
+    <h1>Defang x Javalin</h1>
+</body>
+</html>

samples/javalin/app/target/App.class

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+artifactId=defang-javalin
+groupId=com.defang
+version=1.0-SNAPSHOT

samples/javalin/app/target/defang-javalin-1.0-SNAPSHOT.jar

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+App.class

samples/javalin/app/target/maven-archiver/pom.properties

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+/Users/chris/Documents/GitHub/samples/samples/javalin/app/src/main/java/App.java