Alan Czajkowski created MPH-178:
-----------------------------------
Summary: help:evaluate throws serious warnings
Key: MPH-178
URL: https://issues.apache.org/jira/browse/MPH-178
Project: Maven Help Plugin
Issue Type: Bug
Reporter: Alan Czajkowski
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}
h2. Solution
adding the latest xstream dependency fixes the problem:
{code:xml}
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-help-plugin</artifactId>
<version>3.2.0</version>
<dependencies>
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.18</version>
</dependency>
</dependencies>
</plugin>
{code}
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