ProjectBuildingResult build(boolean parent, Path pomFile, ModelSource modelSource)
                throws ProjectBuildingException {
            ClassLoader oldContextClassLoader = Thread.currentThread().getContextClassLoader();

            try {
                MavenProject project = request.getProject();

                ProblemCollector<ModelProblem> problemCollector = null;
                Throwable error = null;

        if (cliRequest.classWorld == null) {
            cliRequest.classWorld =
                    new ClassWorld("plexus.core", Thread.currentThread().getContextClassLoader());
        }

        ClassRealm coreRealm = cliRequest.classWorld.getClassRealm("plexus.core");
        if (coreRealm == null) {
            coreRealm = cliRequest.classWorld.getRealms().iterator().next();