@Override
  public void checkFileElement(@NotNull DomFileElement<MavenDomProjectModel> domFileElement,
                               @NotNull DomElementAnnotationHolder holder) {
    MavenDomProjectModel projectModel = domFileElement.getRootElement();

    MultiMap<Pair<String,String>, MavenDomPlugin> duplicates = MultiMap.createSet();

    for (MavenDomPlugin plugin : projectModel.getBuild().getPlugins().getPlugins()) {
      String groupId = plugin.getGroupId().getStringValue();
      String artifactId = plugin.getArtifactId().getStringValue();

      if (StringUtil.isEmptyOrSpaces(artifactId)) continue;

      if ("".equals(groupId) || "org.apache.maven.plugins".equals(groupId) || "org.codehaus.mojo".equals(groupId)) {
        groupId = null;
      }

      duplicates.putValue(Pair.create(groupId, artifactId), plugin);
    }

    for (Map.Entry<Pair<String,String>, Collection<MavenDomPlugin>> entry : duplicates.entrySet()) {
      Collection<MavenDomPlugin> set = entry.getValue();
      if (set.size() <= 1) continue;

      for (MavenDomPlugin dependency : set) {
        holder.createProblem(dependency, HighlightSeverity.WARNING,
                             MavenProjectBundle.message("inspection.message.duplicated.plugin.declaration"));
      }
    }
  }
@Override
  public void checkFileElement(@NotNull DomFileElement<MavenDomProjectModel> domFileElement,
                               @NotNull DomElementAnnotationHolder holder)