changed dockerfile

src/DemoApplication.java → DemoApplication.java

@@ -1,5 +1,3 @@
-import io.javalin.Javalin;
-
 public class DemoApplication {
 
     public static void main(String[] args) {

Dockerfile

@@ -1,5 +1,28 @@
+FROM eclipse-temurin:17-jdk AS build
+
+WORKDIR /app
+
+# Download dependencies directly
+RUN curl -L -o javalin.jar https://repo1.maven.org/maven2/io/javalin/javalin/5.6.1/javalin-5.6.1.jar && \
+    curl -L -o gson.jar https://repo1.maven.org/maven2/com/google/code/gson/gson/2.10.1/gson-2.10.1.jar
+
+# Copy Java source
+COPY DemoApplication.java User.java ./
+
+# Compile and package into fat JAR
+RUN javac -cp "javalin.jar:gson.jar" DemoApplication.java User.java && \
+    jar cfe app.jar DemoApplication *.class
+
+# Runtime image
 FROM eclipse-temurin:17-jre
 WORKDIR /app
-COPY target/javalin-demo-0.0.1-SNAPSHOT.jar app.jar
-EXPOSE 7860
-ENTRYPOINT ["java", "-jar", "app.jar"]
+
+# Copy built files + dependencies
+COPY --from=build /app/app.jar .
+COPY --from=build /app/javalin.jar .
+COPY --from=build /app/gson.jar .
+
+EXPOSE 8080
+
+# Run with Javalin + Gson on classpath
+CMD ["java", "-cp", "app.jar:javalin.jar:gson.jar", "DemoApplication"]