Maven Warning when using jdt.apt on Tycho Pomless build

[Waschndolos]

We're currently trying to update to the latest tycho version 4.0.3, comming from 2.0.5 on a huge project. We're getting the following Maven warning for a lot of plugins:

[WARNING] Some problems were encountered while building the effective model for x.y:z:eclipse-plugin:<version>
[WARNING] 'build.plugins.plugin.version' for org.codehaus.mojo:build-helper-maven-plugin is missing.
[WARNING]

The affected plugins have the following prefs file:

<plugin_root>/.settings/org.eclipse.jdt.apt.core.prefs

eclipse.preferences.version=1
org.eclipse.jdt.apt.aptEnabled=true
org.eclipse.jdt.apt.genSrcDir=.apt_generated
[...]

Guess the warning comes from the code at org.eclipse.tycho.pomless.TychoBundleMapping#addAdditionalFolders

buildHelperPlugin = getPlugin(model, "org.codehaus.mojo", "build-helper-maven-plugin");

The resulting .polyglot.META-INF is:

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>x.y</groupId>
    <artifactId>plugins</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <relativePath>..\.polyglot.pom.tycho</relativePath>
  </parent>
  <artifactId>x.y.z</artifactId>
  <version>1.1.1</version>
  <packaging>eclipse-plugin</packaging>
  <name>[bundle] SomeName API</name>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <executions>
          <execution>
            <id>eclipse-classpath-add-source-1</id>
            <phase>initialize</phase>
            <goals>
              <goal>add-source</goal>
            </goals>
            <configuration>
              <sources>
                <source>.apt_generated</source>
              </sources>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

Guess Maven complains here because the version is missing in the generated "pom". Is there a way to ignore the error or maybe add a version when generating the pom?

Tycho: 4.0.3
Maven: apache-maven-3.9.5
Java: 17.0.2

[laeubi]

Is there a way to ignore the error or maybe add a version when generating the pom?

You can/should add a configuration of the desired (most of the time latest version) in your configuration pom (mostly in the root of your project tree).

[akurtakov]

Is there a way for Tycho to define version (latest?) if not already defined by parent?

[laeubi]

I'm not aware of a way to do so, it would either be that the version is fixed (whats bad from maven point of view).

[Waschndolos]

I've added

				<plugin>
				  <groupId>org.codehaus.mojo</groupId>
				  <artifactId>build-helper-maven-plugin</artifactId>
				  <version>3.4.0</version>
				</plugin>

to the pluginManagement/plugins section of the root pom and the warnings are gone. Was it that what you meant?

[laeubi]

. Was it that what you meant?

Yes exactly, that way you ensure that your build is always reproducible.

[Waschndolos]

Perfect, thank you very much! :)