Modifying $project properties with maven-scripting-plugin?

Mirko Friedenhagen <[email protected]> Wed, 7 Jan 2026 17:35:43 +0100
Newsgroups gmane.comp.jakarta.turbine.maven.user
Message-ID <[email protected]>
Hi,

is it somehow possible to add or modify the project resp. its properties during e.g. validate or initialize with this plugin? 
I defined the following and want 

<properties>
  <docker-maven-plugin.from>docker.io/library/eclipse-temurin:21.0.9_10-jre-alpine-3.23</docker-maven-plugin.from>
  <java.version>21<java.version>
</properties>

<plugins>
<plugin>
	<artifactId>maven-scripting-plugin</artifactId>
	<version>3.1.0</version>
	<executions>
		<execution>
			<id>foo</id>
			<phase>initialize</phase>
			<goals><goal>eval</goal></goals>
			<configuration>
				<engineName>java</engineName>
				<script><![CDATA[
					var props = $project.getProperties();
					System.err.println("XXXXX " + props.getProperty("docker-maven-plugin.from"));
					var version = props.getProperty("java.version");
					switch (version) {
						case "21" -> props.setProperty("docker-maven-plugin.from", "docker.io/library/eclipse-temurin:21.0.9_10-jre-alpine-3.23");
						case "25" -> props.setProperty("docker-maven-plugin.from", "docker.io/library/eclipse-temurin:25.0.1_8-jre-alpine-3.23");
						default -> throw new IllegalArgumentException("Not supported“);
					}
					System.err.println("YYYYY " + props.getProperty("docker-maven-plugin.from"));
				]]>
				</script>
			</configuration>
		</execution>
	</executions>
</plugin>
<plugins>

The println statement are executed and show the „correct“ result, however when I lateron reference reference property docker-maven-plugin.from in a plugin it still has the value of the definition in the standard properties section.


Mit freundlichen Grüßen
Mirko Friedenhagen
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