return getMavenSession().getRequest().getDegreeOfConcurrency();
    }

    @Nonnull
    @Override
    public Instant getStartTime() {
        return getMavenSession().getRequest().getStartTime().toInstant();
    }

    @Override
    public Path getRootDirectory() {
        return getMavenSession().getRequest().getRootDirectory();
    }

    @Override
    public Path getTopDirectory() {

                    problems.add(
                            Severity.FATAL,
                            ModelProblem.Version.V31,
                            "Version must be a constant",
                            childModel.getLocation(""));

                } else {
                    if (rawChildVersionReferencesParent(rawChildModelVersion)) {

 * or module hierarchy, but not module source hierarchy. The latter is excluded because this class
 * is for path elements of compiled codes.
 */
class PathModularization {
    /**
     * A unique constant for all non-modular dependencies.
     */
    public static final PathModularization NONE = new PathModularization();

    /**

 * or module hierarchy, but not module source hierarchy. The latter is excluded because this class
 * is for path elements of compiled codes.
 */
class PathModularization {
    /**
     * A unique constant for all non-modular dependencies.
     */
    public static final PathModularization NONE = new PathModularization();

    /**

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                () -> getProject(f1),
                "Expected 'ProjectBuildingException' not thrown.");
        assertThat(e.getResults(), contains(projectBuildingResultWithProblemMessage("Version must be a constant")));
    }

    /**
     * Tests whether local version range parent references are build correctly.
     *
     * @throws Exception in case of issue
     */
    @Test

        addViolation(
                problems,
                severity,
                version,
                fieldName,
                null,
                "contains an expression but should be a constant.",
                tracker);

        return false;
    }

    private boolean validateVersionNoExpression(
            String fieldName,
            ModelProblemCollector problems,