if (t instanceof RuntimeException || !(t instanceof Exception)) {
                // fail fast on RuntimeExceptions, Errors and "other" Throwables
                // assume these are system errors and further build is meaningless
                buildContext.getReactorBuildStatus().halt();
            } else if (MavenExecutionRequest.REACTOR_FAIL_NEVER.equals(session.getReactorFailureBehavior())) {
                // continue the build

   *
   * <p>The returned multimap is not thread-safe or serializable, even if the underlying multimap
   * is. The {@code equals} and {@code hashCode} methods of the returned multimap are meaningless,
   * since there is not a definition of {@code equals} or {@code hashCode} for general collections,
   * and {@code get()} will return a general {@code Collection} as opposed to a {@code List} or a
   * {@code Set}.