added javalin

DemoApplication.java

@@ -1,12 +0,0 @@
-import io.javalin.Javalin;
-
-public class DemoApplication {
-    public static void main(String[] args) {
-        int port = Integer.parseInt(System.getenv().getOrDefault("PORT", "7860"));
-
-        Javalin app = Javalin.create().start(port);
-
-        app.get("/", ctx -> ctx.result("Hello from Javalin on Hugging Face!"));
-        app.get("/ping", ctx -> ctx.result("pong"));
-    }
-}

Dockerfile

@@ -1,25 +1,15 @@
-FROM openjdk:17-jdk-slim
-
+# Stage 1: Build the application with Maven
+FROM maven:3.9.5-eclipse-temurin-17 AS build
 WORKDIR /app
+COPY pom.xml .
+COPY src ./src
+RUN mvn clean package
 
-# Install curl first
-RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
-
-# Download Javalin + dependencies
-RUN mkdir libs && \
-    curl -L -o libs/javalin.jar https://repo1.maven.org/maven2/io/javalin/javalin/5.6.1/javalin-5.6.1.jar && \
-    curl -L -o libs/jetty-server.jar https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-server/11.0.15/jetty-server-11.0.15.jar && \
-    curl -L -o libs/jetty-util.jar https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-util/11.0.15/jetty-util-11.0.15.jar && \
-    curl -L -o libs/jetty-http.jar https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-http/11.0.15/jetty-http-11.0.15.jar && \
-    curl -L -o libs/jetty-io.jar https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-io/11.0.15/jetty-io-11.0.15.jar && \
-    curl -L -o libs/slf4j-simple.jar https://repo1.maven.org/maven2/org/slf4j/slf4j-simple/2.0.7/slf4j-simple-2.0.7.jar && \
-    curl -L -o libs/slf4j-api.jar https://repo1.maven.org/maven2/org/slf4j/slf4j-api/2.0.7/slf4j-api-2.0.7.jar
-
-COPY DemoApplication.java /app/
-
-RUN javac -cp "libs/*" DemoApplication.java
-
-ENV PORT=7860
+# Stage 2: Create a lightweight runtime image
+FROM eclipse-temurin:17-jre-alpine
+WORKDIR /app
+COPY --from=build /app/target/app.jar /app/app.jar
+# This is the port that your Javalin application will listen on
 EXPOSE 7860
-
-CMD ["java", "-cp", ".:libs/*", "DemoApplication"]
+# Run the application
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]

README.md

@@ -1,10 +1,12 @@
 ---
-title: Java Endpoint
-emoji: 🐨
-colorFrom: gray
-colorTo: yellow
+title: Javalin App
+emoji: 🚀
+colorFrom: blue
+colorTo: green
 sdk: docker
-pinned: false
+app_port: 7860
 ---
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+# Javalin Application on Hugging Face Spaces
+
+This is a simple Javalin application running in a Docker container on Hugging Face Spaces.

demo/pom.xml

@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.example</groupId>
+    <artifactId>javalin-on-huggingface</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.javalin</groupId>
+            <artifactId>javalin</artifactId>
+            <version>6.1.3</version>
+        </dependency>
+        <!-- Add other dependencies here -->
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <transformers>
+                        <transformer
+                            implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                            <mainClass>app.Main</mainClass> <!-- Make sure this is your main class -->
+                        </transformer>
+                    </transformers>
+                    <filters>
+                        <filter>
+                            <artifact>*:*</artifact>
+                            <excludes>
+                                <exclude>META-INF/*.SF</exclude>
+                                <exclude>META-INF/*.DSA</exclude>
+                                <exclude>META-INF/*.RSA</exclude>
+                            </excludes>
+                        </filter>
+                    </filters>
+                    <!-- The final name of the shaded JAR -->
+                    <finalName>app</finalName>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

demo/src/main/java/com/example/Main.java

@@ -0,0 +1,11 @@
+package app;
+
+import io.javalin.Javalin;
+
+public class Main {
+    public static void main(String[] args) {
+        Javalin app = Javalin.create()
+            .get("/", ctx -> ctx.result("Hello from Javalin on Hugging Face Spaces!"))
+            .start(7860);
+    }
+}