Added Spring Boot example

java-spring-boot/Dockerfile

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+# Use the official Maven image to create a build artifact.
+# This uses Maven and OpenJDK 17, adjusted to match your project requirements
+FROM maven:3.8.4-openjdk-17-slim AS build
+
+# Copy the pom.xml file and download all dependencies.
+COPY pom.xml /home/app/pom.xml
+RUN mvn -f /home/app/pom.xml dependency:resolve
+
+# Copy the project source
+COPY src /home/app/src
+
+# Build the application
+RUN mvn -f /home/app/pom.xml clean package
+
+# Use the official OpenJDK image for a base image.
+FROM openjdk:17.0.1-jdk-slim
+
+# Copy the jar file from the build stage into the /opt/app directory
+COPY --from=build /home/app/target/some-test-0.0.1-SNAPSHOT.jar /opt/app/app.jar
+
+# Set the working directory to /opt/app
+WORKDIR /opt/app
+
+# Expose the port the app runs on
+EXPOSE 5000
+
+# Set the container to execute the application on start
+ENTRYPOINT ["java","-jar","app.jar"]