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 > >
