@Nullable
  private static LanguageLevelQuickFix getInstance(@NotNull Project project, @NotNull MavenProject mavenProject, boolean targetVersion) {
    FixHolder holder = getFixHolder(project, mavenProject, targetVersion);
    if (holder == null) return null;
    return holder.toInstance();
  }
@Nullable
  private static LanguageLevelQuickFix getInstance(@NotNull Project project, @NotNull MavenProject mavenProject, boolean targetVersion)