Spring Boot - How to build layered jar

In this article, I will show you how you can build a simple CRUD application and create a layered jar. The inventory service manages inventory, such as left stocks, i.e., some drinks, merch, or something else that can be stored in the warehouse.

Reasons for choosing layered jar:

• If you have an extensive application with different dependencies
• If you need flexibility in layer updates

Reasons for choosing Uber Jar:

• If you have a simple application with a relatively small number of dependencies
• If you need simplicity in the deployment process

FROM eclipse-temurin:17 as JAR_EXTRACT
WORKDIR /app
ARG JAR_FILE=*.jar
COPY ./target/${JAR_FILE} ./app.jar
RUN java -Djarmode=layertools -jar ./app.jar extract
FROM eclipse-temurin:17
WORKDIR /application
COPY --from=JAR_EXTRACT /app/dependencies ./
COPY --from=JAR_EXTRACT /app/spring-boot-loader ./
COPY --from=JAR_EXTRACT /app/snapshot-dependencies ./
COPY --from=JAR_EXTRACT /app/application ./
ENTRYPOINT ["java", "org.springframework.boot.loader.launch.JarLauncher"]
EXPOSE 8080

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