[jira] [Created] (MPH-220) Evaluating an expression for use in a script fails on Maven 4.0.0-rc-1

[Nils Breunese (Jira)]

Nils Breunese created MPH-220:
---------------------------------

             Summary: Evaluating an expression for use in a script fails on 
Maven 4.0.0-rc-1
                 Key: MPH-220
                 URL: https://issues.apache.org/jira/browse/MPH-220
             Project: Maven Help Plugin
          Issue Type: Bug
          Components: evaluate
    Affects Versions: 3.5.1
            Reporter: Nils Breunese


https://maven.apache.org/plugins/maven-help-plugin/evaluate-mojo.html shows 
that to use the value of an expression in a script, you can use this:

{code}
mvn help:evaluate -Dexpression=project.version -q -DforceStdout
{code}

I use a variant of this in a project and it works fine with Maven 3.9.9, but 
when I try it with Maven 4.0.0-rc-1, I no longer get the expected output.

Here is a small reproducer POM:

{code}
<?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 
http://maven.apache.org/xsd/maven-4.0.0.xsd";>
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.example</groupId>
  <artifactId>foo</artifactId>
  <version>${revision}</version>
  <packaging>pom</packaging>

  <properties>
    <revision>1.0.0-SNAPSHOT</revision>
  </properties>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-help-plugin</artifactId>
        <version>3.5.1</version>
      </plugin>
    </plugins>
  </build>
</project>
{code}

This returns {{1.0.0-SNAPSHOT}} with Maven 3.9.9:

{code}
❯ mvn help:evaluate -Dexpression=project.version -q -DforceStdout
1.0.0-SNAPSHOT
{code}

But there is no output with Maven 4.0.0-rc-1:

{code}
❯ mvn help:evaluate -Dexpression=project.version -q -DforceStdout
{code}

Note that when I omit the {{-q}} flag, then I do see the expected version in 
the output, but that output is of course not usable in an automated script.



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