Looks like https://issues.apache.org/jira/browse/MNG-8256 introduced code that causes this problem
On Wed, Jul 2, 2025 at 11:57 AM Laird Nelson <ljnel...@gmail.com> wrote: > Will do. It's certainly possible, I guess, in 3.9.10. > > Here's one place the non-volatile artifacts instance field is set: > https://github.com/apache/maven/blob/maven-3.9.10/maven-core/src/main/java/org/apache/maven/project/MavenProject.java#L661 > > Here's another: > https://github.com/apache/maven/blob/maven-3.9.10/maven-core/src/main/java/org/apache/maven/project/MavenProject.java#L1457 > > And another: > https://github.com/apache/maven/blob/maven-3.9.10/maven-core/src/main/java/org/apache/maven/project/MavenProject.java#L1471 > > So if for some reason any of those happens, then this: > https://github.com/apache/maven/blob/maven-3.9.10/maven-core/src/main/java/org/apache/maven/project/MavenProject.java#L683 > > …might be null. We're still trying to figure out how to reproduce this in > a tidy manner; in the meantime my prior message shows the bug tripping in > one of our (public) CI runs. > > On Tue, Jul 1, 2025 at 4:32 AM Elliotte Rusty Harold <elh...@ibiblio.org> > wrote: > >> 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 <ljnel...@gmail.com> 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 >> elh...@ibiblio.org >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@maven.apache.org >> For additional commands, e-mail: users-h...@maven.apache.org >> >>
