Question: How to add a separate .jar as a Java Agent and modify Docker image ENTRYPOINT args

[LoPan455]

I've successfully built and run the Kubernetes "flavor" of the Spring Pet Clinic Microservices project. I'd like to add a 3rd party JAR file to the output image, but I am failing to see where I can the directives to download the desired Java Agent .jar file and modify the default ENTRYPOINT directive to add the -javaagent flag to the ENTRYPOINT.

After reviewing the parent pom.xml and researching the spring-boot-maven-plugin docs, it appears that all I would need to do would be to modify the Dockerfile that's the basis for each service's Docker image, but it doesn't appear that a Dockerfile is used when this command is invoked:

./mvnw spring-boot:build-image -Pk8s -DREPOSITORY_PREFIX=${REPOSITORY_PREFIX} && ./scripts/pushImages.sh

Based on how I understand the project is designed, the Dockerfile located at <project root path>/docker/Dockerfile is only used when this command is executed:

./mvnw clean install -P buildDocker

I think I'm losing the trail of breadcrumbs to understand how all the pieces fit together. Any guidance on where I can define my additional requirements of adding an additional .jar file to the output image and modify the ENTRYPOINT directive in that image would be greatly appreciated.

I have been able to discover a means to download and place the Java Agent .jar file into a specific module's target path with the following addition to the module's pom.xml. This case, I added to the spring-petclinic-customers-service module with the following xml snippet:

<plugin>
                <groupId>com.googlecode.maven-download-plugin</groupId>
                <artifactId>maven-download-plugin</artifactId>
                <version>1.0.0</version>
                <executions>
                    <execution>
                        <id>fetch-java-agent</id>
                        <phase>generate-resources</phase>
                        <goals>
                            <goal>wget</goal>
                        </goals>
                        <configuration>
                            <url>path-to-my-third-party-jar</url>
                            <unpack>false</unpack>
                            <outputDirectory>${project.build.directory}</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

I feel like this might be part of the overall solution, but I am not sure how this would be copied into the image, nor how to modify the ENTRYPOINT command.

[arey]

Hi @LoPan455
It looks like your question is related to the https://github.com/spring-petclinic/spring-petclinic-cloud/ project and not this spring-petclinic-microservice project that does not provide k8s support. If you confirm, I propose you copy your question in a new issue
Regards

[LoPan455]

@arey You are correct, my mistake. Thank you for the response.