Maarten Mulders created MNG-7360:
------------------------------------
Summary: Can't parse project that has <parent> tag in plugin
configuration
Key: MNG-7360
URL: https://issues.apache.org/jira/browse/MNG-7360
Project: Maven
Issue Type: Bug
Components: POM
Affects Versions: 4.0.x-candidate
Environment: Apache Maven 4.0.0-alpha-1-SNAPSHOT
(3a06530dbce82e2054afa3cc4c81631910474bd0)
Maven home: /usr/local/Cellar/maven-snapshot/4.0.0-alpha-1-SNAPSHOT_290/libexec
Java version: 17.0.1, vendor: Eclipse Adoptium, runtime:
/Library/Java/JavaVirtualMachines/temurin-17.jdk/Contents/Home
Default locale: en_GB, platform encoding: UTF-8
OS name: "mac os x", version: "11.5", arch: "x86_64", family: "mac"
Reporter: Maarten Mulders
Attachments: Screenshot 2021-12-13 at 13.45.01.png
The Apache Camel project has the following snippet in their root POM:
{code:xml}
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>flatten-maven-plugin</artifactId>
<version>1.2.5</version>
<executions>
<execution>
<id>default-cli</id>
<phase>process-resources</phase>
<goals>
<goal>flatten</goal>
</goals>
<configuration>
<!-- snip -->
<pomElements>
<!-- snip -->
<parent>expand</parent>
<!-- snip -->
</pomElements>
</configuration>
</execution>
</executions>
</plugin>
{code}
With Maven 4's "Build Consumer" feature enabled, parsing this plugin definition
breaks with
{code:none}
[INFO] BuildTimeEventSpy is registered.
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[FATAL] Unable to transform pom
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project (/Users/maarten/Code/open-source/camel/pom.xml) has 1
error
[ERROR] Unable to transform pom: Not a regular file:
/Users/maarten/Code/open-source/pom.xml
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the '-e'
switch
[ERROR] Re-run Maven using the '-X' switch to enable verbose output
[ERROR]
[ERROR] For more information about the errors and possible solutions, please
read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
{code}
I suspect that the {{<parent>}} tag is the culprit. It seems to me that it
causes the {{ParentXMLFilter}} to think it needs to do its work. The attached
screenshot shows the stacktrace that brought me to this idea. As the
{{BufferingParser}} class processes its buffer of events, it encounters a
situation of an "end {{parent}} tag". But that {{parent}} tag did not have
child elements {{version}} and {{relativePath}} and so, it decides it needs to
resolve the parent as {{../pom.xml}} against the project path
({{/Users/maarten/Code/open-source/camel/}} in my case), leading to the
non-existing path of {{/Users/maarten/Code/open-source/pom.xml}}.
I think the bug here is not that it resolves to a non-existing path (it's good
to check that before actually reading the file). I think the bug is that the
{{ParentXMLFilter}} is acting on the {{parent}} tag inside the plugin
configuration.
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