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javamaventravis-ci

How to point maven-verifier at right version of Maven?

I am using Maven Wrapper on Travis because it ships with a super-old version of Maven by default.

The library being built runs integration tests using maven-verifier. The latter forks a JVM to run each integration test using the (outdated) Maven instance installed on the system.

Is there a way to get maven-verifier to use the Maven version provided by Maven Wrapper?

Solution

  • According to the implementation of org.apache.maven.it.Verifier#getMavenLauncher (at version 1.7.2 when checked), it will attempt to use a Maven wrapper if that wrapper is present in the repository that you are running the test on (not in the project repository that is running the test).

    boolean useWrapper = Files.exists(Paths.get(getBasedir(), "mvnw"));

    getBasedir() is the root of the project folder being tested here. I had the same issue and I copied the mvnw and .mvn folders into the project I was testing, and it did indeed find the appropriate version of Maven.

    My new projects to be tested look like this

    default-test-project
    |_ .mvn/
    |_ mvnw
    |_ pom.xml

    It's worth mentioning that Verifier#getMavenLauncher doesn't appear to check for a mvnw.cmd so this may not work on a Windows machine.