* {@link ReflectionValueExtractor} class.</p>
         */
        public Object getValue(String expression) {
            if (expression == null || expression.trim().isEmpty()) {
                return null;
            }

            try {
                return ReflectionValueExtractor.evaluate(expression, root, false);
            } catch (Exception e) {

            boolean isBlankVersion = descriptor.getRequiredMavenVersion() == null
                    || descriptor.getRequiredMavenVersion().trim().isEmpty();

            if (isBlankVersion) {
                // only take value from underlying POM if plugin descriptor has no explicit Maven requirement

            infos.put(dstKey, srcInfo);
        }
    }

    private String getKey(String classifier, String extension) {
        return (classifier == null ? "" : classifier.trim()) + ':' + (extension == null ? "" : extension.trim());
    }

    private ArtifactRepository getRepository(
            RepositorySystemSession session, List<RemoteRepository> repositories, Class<?> repoClass, String repoId) {

        String localRepoTail = mergedProps.get(MAVEN_REPO_LOCAL_TAIL);
        if (localRepoTail != null) {
            Arrays.stream(localRepoTail.split(","))
                    .filter(p -> p != null && !p.trim().isEmpty())
                    .map(Paths::get)
                    .forEach(paths::add);
        }
        sessionBuilder.withLocalRepositoryBaseDirectories(paths);