Creating Docker image with springboot layertools - does not find profile specific application properties

Question

I am following the tutorial here and here on how to create a layered Docker image from my springboot backend. I end up with the following Dockerfile:

FROM openjdk:8-jre-slim as builder
WORKDIR application
ARG JAR_FILE=target/*-exec.jar
COPY ${JAR_FILE} application.jar
RUN java -Djarmode=layertools -jar application.jar extract

FROM openjdk:8-jre-slim
WORKDIR application
COPY --from=builder application/dependencies/ ./
COPY --from=builder application/spring-boot-loader/ ./
COPY --from=builder application/snapshot-dependencies/ ./
COPY --from=builder application/application/ ./
ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

The problem is that when I run this in my docker-compose with a Spring profile TST, that it does not find application-tst.properties. I can see from the logs that Spring profile TST is active on startup, yet it only loads the properties from application.properties.

As a sanity check I copied the properties from application-tst.properties over to application.properties and rebuilt my image, which then worked fine (it connects to the database container etc).

I extracted the contents of my executable jar (which is the jar from line 3 in the Dockerfile) and can confirm that application-tst.properties is present there. Anyone know what the issue is?

Answer 1

I found the answer and it's a really dumb one... The Spring profile is case sensitive, so

SPRING_PROFILES_ACTIVE=TST

should become

SPRING_PROFILES_ACTIVE=tst