wro4j-core/src/main/java/ro/isdc/wro/model/WroModel.java
private void identifyDuplicateGroupNames(final Collection<Group> groups) {
    LOG.debug("identifyDuplicateGroupNames");
    final List<String> groupNames = new ArrayList<String>();
    for (final Group group : groups) {
      if (groupNames.contains(group.getName())) {
        throw new WroRuntimeException("Duplicate group name detected: " + group.getName());
      }
      groupNames.add(group.getName());
    }
  }
private void identifyDuplicateGroupNames(final Collection<Group> groups) {
    LOG.debug("identifyDuplicateGroupNames");
    final List<String> groupNames = new ArrayList<String>();
    for (final Group group : groups) {
      if (groupNames.contains(group.getName())) {
        throw new WroRuntimeException("Duplicate group name detected: " + group.getName());
      }
      groupNames.add(group.getName());
    }
  }
Identify duplicate group names.

@param groups a collection of group to validate.