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https://issues.apache.org/jira/browse/MNG-7261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419408#comment-17419408
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Alan Czajkowski commented on MNG-7261:
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i've created an issue in the plugin's issue tracker:
https://issues.apache.org/jira/browse/MPH-178
> help:evaluate throws serious warnings
> -------------------------------------
>
> Key: MNG-7261
> URL: https://issues.apache.org/jira/browse/MNG-7261
> Project: Maven
> Issue Type: Bug
> Components: Command Line
> Affects Versions: 3.8.2
> Reporter: Alan Czajkowski
> Priority: Major
> Labels: help
>
> h2. Problem
> *{{mvn help:evaluate}}* throws serious warnings:
> {code:sh}
> $ mvn help:evaluate -Dexpression=project.modules --quiet -DforceStdout
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by
> com.thoughtworks.xstream.core.util.Fields
> (file:/Users/alan/.m2/repository/com/thoughtworks/xstream/xstream/1.4.11.1/xstream-1.4.11.1.jar)
> to field java.util.TreeMap.comparator
> WARNING: Please consider reporting this to the maintainers of
> com.thoughtworks.xstream.core.util.Fields
> WARNING: Use --illegal-access=warn to enable warnings of further illegal
> reflective access operations
> WARNING: All illegal access operations will be denied in a future release
> <strings>
> <string>child-1</string>
> <string>child-2</string>
> <string>child-3</string>
> </strings>
> {code}
> h2. Background
> Maven & JDK version:
> {code:sh}
> $ mvn -v
> Apache Maven 3.8.2 (ea98e05a04480131370aa0c110b8c54cf726c06f)
> Maven home: /usr/local/Cellar/maven/3.8.2/libexec
> Java version: 11.0.12, vendor: Amazon.com Inc., runtime:
> /Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home
> Default locale: en_CA, platform encoding: UTF-8
> OS name: "mac os x", version: "10.14.6", arch: "x86_64", family: "mac"
> {code}
> Create a multi-module project similar to:
> {code:xml}
> <?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>com.example</groupId>
> <artifactId>parent</artifactId>
> <version>1.0.0-SNAPSHOT</version>
> <packaging>pom</packaging>
> <name>Example - Parent</name>
> <description>${project.name}</description>
> <modules>
> <module>child-1</module>
> <module>child-2</module>
> <module>child-3</module>
> </modules>
> ...
> {code}
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