Different plugin classpath in Maven 3.6.3 and 4.0.0?

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Different plugin classpath in Maven 3.6.3 and 4.0.0?

Mirko Friedenhagen-5
Hello,

* I now gave Apache Maven 4.0.0-alpha-1-SNAPSHOT (84a1ff2d5cb7bf49fa3171dd92f7ac088e837185) a try.
* In my POM I configured the net.rumati.maven.plugins:velocity-maven-plugin which should render a HTML file.
* The parent of the project has a global extension in the build section.
* The jar of the extension does include a velocity which is picked up quite fine by the velocity-maven-plugin from
the classpath by 3.6.3 but when using 4.0.0 I now need to add the extension jar as a dependency to the plugin.


Is this an intended behavior?

Best Regards
Mirko
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Re: Different plugin classpath in Maven 3.6.3 and 4.0.0?

Mirko Friedenhagen-5
Not that deep in bisecting as of now. I wrote a small script `bisect`:

```
#!/bin/bash -e -p
mvn -q -B -s ~/.m2/settings-oss.xml clean package -Dmaven.test.skip=true -Denforcer.skip=true -Drat.skip=true
bin_tar_gz=apache-maven/target/apache-maven-[3,4]*-bin.tar.gz
test -f $bin_tar_gz
gunzip -dc $bin_tar_gz | (cd /tmp/ && rm -rf apache-maven-*-SNAPSHOT && tar x)
cd $HOME/ghq/gitlab.example.com/group/failing-project
/tmp/apache-maven-*-SNAPSHOT/bin/mvn -B -V -q clean verify -DskipTests
```

Running:
```
$ git bisect start 84a1ff2d5cb7bf49fa3171dd92f7ac088e837185 maven-3.6.3
$ git bisect run ./bisect
```

led to:

```
$ git bisect log
# bad: [84a1ff2d5cb7bf49fa3171dd92f7ac088e837185] [MNG-7063] Add unittest to ensure rereading a pom won't return the cached Model

# first bad commit: [619973b91cff5af7b5695bda11761a982a159349] [MNG-7063] Infinite loop using Shade plugin and JUnit 5 dependency
```

Best Regards
Mirko


> Am 23.02.2021 um 10:21 schrieb Michael Osipov <[hidden email]>:
>
> Am 2021-02-23 um 10:16 schrieb Mirko Friedenhagen:
>> Hello Michal, hello Robert,
>> Thanks for the answers.
>> I am trying to reproduce this with a smaller project, but it is quite hard. The problem occurs with an inhouse project where we use inhouse plugins etc. We manage the lifecycle of standard packagings as well in the the extension. I wrote a FOSS derivate (not widely use) and will try to give a small example.
>> Robert, did you mean to bisect the maven-core?
>
> Yes, he did. This is what I would do.
>
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