Maven cache sometimes not working

Question

I have a pipeline that does a Maven install, and then a SonarCloud analysis using Maven. I have a m2 repository cache configured in the pipeline. I see the cache being used during the Maven install, but not in the Maven SonarCloud analysis. This is constant after three builds. I have a private Nexus repository where dependencies are downloaded. The cache is configured as follows:definitions: caches: custom-maven: key: files: - pom.xml path: /usr/share/maven/ref/repository The Maven install step is as follows: - step: &build-test name: Build & test caches: - custom-maven script: - mvn -B -T2C install -s ./settings.xml artifacts: - target/*.jar* The SonarCloud analysis: - step: &sonarcloud name: Static code analysis using SonarCloud image: name: [some private image] username: $DOCKER_USERNAME password: $DOCKER_PASSWORD caches: - custom-maven - custom-sonar script: - mvn -B -T2C verify sonar:sonar -s ./settings.xml The (I think) relevant bit from settings.xml:/usr/share/maven/ref/repository The logs of the Maven install: + mvn -B -T2C install -s ./settings.xml[INFO] Scanning for projects...[INFO] [INFO] Using the MultiThreadedBuilder implementation with a thread count of 8[INFO] [INFO] ----------------------< package:artifact >----------------------[INFO] Building artifact 1.2.3.BUILD-SNAPSHOT[INFO] --------------------------------[ jar ]--------------------------------- The logs of the SonarCloud analysis: + mvn -B -T2C verify sonar:sonar -s ./settings.xml[INFO] Scanning for projects...[INFO] Downloading from private-nexus: https://private.nexus.com/repository/maven-public/com/spotify/dockerfile-maven-plugin/1.4.10/dockerfile-maven-plugin-1.4.10.pom[INFO] Downloaded from private-nexus: https://private.nexus.com/repository/maven-public/com/spotify/dockerfile-maven-plugin/1.4.10/dockerfile-maven-plugin-1.4.10.pom (5.6 kB at 5.7 kB/s)[INFO] Downloading from private-nexus: https://private.nexus.com/repository/maven-public/com/spotify/dockerfile-maven/1.4.10/dockerfile-maven-1.4.10.pom[INFO] Downloaded from private-nexus: https://private.nexus.com/repository/maven-public/com/spotify/dockerfile-maven/1.4.10/dockerfile-maven-1.4.10.pom (2.4 kB at 8.1 kB/s)[INFO] Downloading from private-nexus: https://private.nexus.com/repository/maven-public/com/spotify/foss-root/6/foss-root-6.pom...many more downloads...[INFO] Downloading from private-nexus: https://private.nexus.com/repository/maven-public/org/sonarsource/scanner/maven/sonar-maven-plugin/3.9.1.2184/sonar-maven-plugin-3.9.1.2184.jar[INFO] Downloaded from private-nexus: https://private.nexus.com/repository/maven-public/org/sonarsource/scanner/maven/sonar-maven-plugin/3.9.1.2184/sonar-maven-plugin-3.9.1.2184.jar (50 kB at 177 kB/s)[INFO] [INFO] Using the MultiThreadedBuilder implementation with a thread count of 8[INFO] [INFO] ----------------------< package:artifact >----------------------[INFO] Building artifact 1.2.3.BUILD-SNAPSHOT[INFO] --------------------------------[ jar ]--------------------------------- The cache is available when I look in the Bitbucket UI: What I want is for the caching to work during the SonarCloud analysis as well. What is going on here? What can I do to fix this?

Mark Gortzak · Accepted Answer

I talked with support, the cache is being used. The build time is faster. Maven seems to sometimes/always download certain dependencies. This might be a problem with our Maven configuration. So it has nothing to do with Bitbucket.