[MNG-7261] help:evaluate throws serious warnings

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 3.8.2
• Component/s: Command Line
• Labels: help
• Assignee: Unassigned
• Reporter: Alan Czajkowski
• Created: 22/Sep/21 23:18
• Updated: 23/Sep/21 19:40
• Resolved: 23/Sep/21 19:40

Description

Problem

mvn help:evaluate throws serious warnings:

$ 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>

Background

Maven & JDK version:

$ 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"

Create a multi-module project similar to:

<?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>

  ...