Hi everybody,
I have a complex multi module build with 171 modules in total and a nesting
depth of up to 4. Too speed up the build, I wanted to use the parallel build
feature of Maven 3.0.5 with 4 threads:
https://cwiki.apache.org/confluence/display/MAVEN/Parallel+builds+in+Maven+3
The build starts like normal and the reactor build order is correctly
identified (and is identical to the single threaded one).
But the build fails shortly after, when the assembly plugin is looking for a
submodule's artefact file, which does not (yet!) exist. The final print of the
build status reveals, that projects where tried to build from "the middle of
the reactor build order". This certainly has to fail, because their
dependencies would have been earlier in the build order and haven't been built
yet.
The situation is repeatable and always the same: 2 aggregators have been built
successfully and 3 aggregator projects have failed.
I debugged Maven 3.0.5 to the point, that I think this is a bug, but wanted to
assure with you here first.
I suspect the initialisation of the Directed Acyclic Graph (DAG) in the
org.apache.maven.project.ProjectSorter Class to be faulty. I debugged it for
one of my multi module projects. There I can see that for all dependencies,
build plugins, build extensions and the parent, edges are added to the DAG. But
not so for the modules!?
Since the modules are not considered, these aggregator projects are built very
early and cause the assembly plugin to fail afterwards.
Any ideas? Is this a bug?
Best regards,
Peter Wippermann
Senior Consultant
IBM Global Business Services
Application Innovation Services - Insurance
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