[FIXED] Maven does not update parent version with -Dmaven.local.repo from CLI

Issue

I am trying to update the version in a maven pom.xml that depends on a parent pom.xml.

I have /pom.xml that looks like this

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>me.burnian</groupId>
    <artifactId>parent</artifactId>
    <version>14.0.0</version>
    <packaging>pom</packaging>

    <!-- Plugins & other modules -->
</project>

And the child /child/pom.xml that looks like this (and is not a module in parent's pom).

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>me.burnian</groupId>
        <artifactId>parent</artifactId>
        <version>13.0.0</version>
        <!-- I've tried <relativePath>../pom.xml</relativePath> with no success -->
    </parent>

    <artifactId>child</artifactId>

    <!-- Again other stuff I think irrelevant here -->
</project>

As you can see, child's pom.xml refers to version 13.0.0 of parent, which is now version 14.0.0. My goal is to update the version in the parent section to the correct version, using CLI only.

I've tried this sequence of commands which works properly and updates the parent version in the child's pom.xml:

mvn versions:set -DnewVersion=14.0.0 # To update parent version
mvn clean install # To build parent module with new version
mvn -f child/pom.xml versions:update-parent -DparentVersion="[14.0.0]"

But whenever I try to implement it with -Dmaven.repo.local, the same process fails.

mvn -Dmaven.repo.local=./.m2/ versions:set -DnewVersion=14.0.0
mvn -Dmaven.repo.local=./.m2/ clean install
mvn -Dmaven.repo.local=./.m2/ -f child/pom.xml versions:update-parent -DparentVersion="[14.0.0]"

The third command fails with Could not find artifact me.burnian.parent:parent:pom:13.0.0 in Proxied-Maven. I've tried adding -DforceUpdate=true but since I am not with a RELEASE or LATEST version (and can't use one), it has no effect.

Is there something I am missing? I've checked and there is indeed me.burnian with a parent/14.0.0 folder in the ./.m2 repository, but the last command seems not to find it.

Thanks for your help

Solution

That is chicken-egg problem: in order to update parent version in child/pom.xml versions:update-parent need to initialise reactor, but it fails because there is no parent with previous version in local repository. If child were a submodule the versions:update-child-modules would help, in your case I believe the options are:

• install old version of parent first (mvn clean install -N)
• modify pom.xml using sed/awk/etc
• create new pom (e.g. fakepom.xml) with modules parent and child and run something like:

mvn -ffakepom.xml versions:set -DnewVersion=${newVersion} --pl parent
mvn -ffakepom.xml versions:update-child-modules

Answered By - Andrey B. Panfilov
Answer Checked By - Katrina (JavaFixing Volunteer)