Re: NPE in MavenProject (3.9.10) in parallel build

That shouldn't be possible, at least not with the code I see at head.
Please file a bug though a reproducible test case might be required to
do anything about this.

On Tue, Jul 1, 2025 at 1:26 AM Laird Nelson <[email protected]> wrote:
>
> Curious if people have seen this NPE before:
> https://github.com/helidon-io/helidon/actions/runs/15985949089/job/45090504083?pr=10313#step:3:9789
>
> We're running with -T8 (
> https://github.com/helidon-io/helidon/actions/runs/15985949089/job/45090504083?pr=10313#step:3:166).
> (Github Actions.)
>
> Relevant snippet:
>
> Caused by: java.lang.NullPointerException: Cannot invoke
> "java.util.Set.add(Object)" because "this.artifacts" is null
> at org.apache.maven.project.MavenProject.getArtifacts
> (MavenProject.java:683)
> at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.getPathElements
> (AbstractJavadocMojo.java:2491)
> at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.addJavadocOptions
> (AbstractJavadocMojo.java:4550)
> at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeReport
> (AbstractJavadocMojo.java:1968)
>
> The fact that it was javadocs I think may be immaterial. It is certainly
> the case that MavenProject is not thread safe. Maybe that's by design?
> Should I file a bug?
>
> Best,
> Laird



-- 
Elliotte Rusty Harold
[email protected]