Maven Plugin - the option to set extraClasspath in the plugin configuration isn't working

[miriambron]

Jetty version : 10.0.8

Java version/vendor :jdk-11.0.12

OS type/version : Windows 10

Description
In version 10.0.8 , the class org.eclipse.jetty.webapp.WebAppContext is no more POJO class,
since there is an overloading to the setter setExtraClasspath :

   public void setExtraClasspath(String extraClasspath) throws IOException
    {
        setExtraClasspath(Resource.fromList(extraClasspath, false, this::newResource));
    }

    public void setExtraClasspath(List<Resource> extraClasspath)
    {
        _extraClasspath = extraClasspath;
    }

so that , the maven plugin can't set this value , since the sisu-plexus is taking the 1st setter by reflection , assuming there is only one
This bug is not consistent , because if the classloader will find the 1st overload as the 1st setter, it will work ,
but if the 2nd overload will be the 1st setter , so the sisu-plexus won't be able to construct List from the string input

How to reproduce?

1. Create a jetty maven project,
2. in your pom.xml, add build proflie for jetty for example :

        <profile>
            <id>jetty</id>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.eclipse.jetty</groupId>
                        <artifactId>jetty-maven-plugin</artifactId>
                        <configuration>
                            <webApp>
                                <extraClasspath>/path/to/classpath</extraClasspath>
                            </webApp>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>

3. run your maven build with this profile, since this bug is not consistent , you may need to try to build several times in order to get the error -

[ERROR] Failed to execute goal org.eclipse.jetty:jetty-maven-plugin:10.0.8:run (default-cli) on project test-jetty: Unable to parse configuration of mojo org.eclipse.jetty:jetty-maven-plugin:10.0.8:run for parameter #: Cannot create instance of class org.eclipse.jetty.util.resource.Resource: InstantiationException -> [Help 1]

[joakime]

Opened PR #8268

[rinnnn]

I just tried to migrate today from version 10.0.16 of jetty-maven-plugin to version 12.0.8 of jejetty-ee10-maven-plugin (which uses jetty-12.0.8), and reproduced this issue in the Jetty 12... Was the fix done in v10 migrated to v12 properly?

Everything as written in this issue - it sometimes picks up the String constructor and works, while the other times it picks the List constructor and fails with "Cannot create instance of class org.eclipse.jetty.util.resource.Resource".

[olamy]

@rinnnn it should be almost the same code.
please open a new issue (if possible with a reproducer) as commenting on a closed issue will be lost.

[rinnnn]

Opened #11732