rm build artifacts and get dockerfile production ready

Author: raphaeltm

samples/javalin/app/.dockerignore

@@ -0,0 +1,34 @@
+# Compiled class files
+*.class
+
+# Log files
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# IntelliJ IDEA files
+.idea/
+*.iml
+
+# VS Code files
+.vscode/
+
+# macOS Finder metadata
+.DS_Store
+
+# Maven target directory
+target/
+
+# Database files
+*.db
+*.sqlite
+*.sqlite3

samples/javalin/app/.gitignore

@@ -0,0 +1,34 @@
+# Compiled class files
+*.class
+
+# Log files
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# IntelliJ IDEA files
+.idea/
+*.iml
+
+# VS Code files
+.vscode/
+
+# macOS Finder metadata
+.DS_Store
+
+# Maven target directory
+target/
+
+# Database files
+*.db
+*.sqlite
+*.sqlite3

samples/javalin/app/Dockerfile

@@ -1,14 +1,28 @@
-# Use a base image with OpenJDK
+# Stage 1: Build the application
+FROM maven:3.8.4-openjdk-17-slim AS build
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the pom.xml and download dependencies
+COPY pom.xml .
+RUN mvn dependency:go-offline
+
+# Copy the source code and build the application
+COPY src ./src
+RUN mvn clean package
+
+# Stage 2: Create the runtime image
 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
+# Copy the built jar file from the build stage
+COPY --from=build /app/target/defang-javalin-1.0.0.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"]
+CMD ["java", "-jar", "/app/app.jar"]

samples/javalin/app/pom.xml

@@ -3,9 +3,9 @@
          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>
+    <groupId>io.defang</groupId>
     <artifactId>defang-javalin</artifactId>
-    <version>1.0-SNAPSHOT</version>
+    <version>1.0.0</version>
 
     <dependencies>
         <dependency>