Program: 85096
Project: 85096
Buggy source:
public void notify(List<URL> urls){
  if (urls == null || urls.isEmpty()) {
    return;
  }
  final Map<String,Map<String,Map<Long,URL>>> categories=new HashMap<String,Map<String,Map<Long,URL>>>();
  for (  URL url : urls) {
    String category=url.getParameter(Constants.CATEGORY_KEY,Constants.PROVIDERS_CATEGORY);
    if (Constants.EMPTY_PROTOCOL.equalsIgnoreCase(url.getProtocol())) {
      ConcurrentMap<String,Map<Long,URL>> services=registryCache.get(category);
      if (services != null) {
        String group=url.getParameter(Constants.GROUP_KEY);
        String version=url.getParameter(Constants.VERSION_KEY);
        if (!Constants.ANY_VALUE.equals(group) && !Constants.ANY_VALUE.equals(version)) {
          services.remove(url.getServiceKey());
        }
 else {
          for (          Map.Entry<String,Map<Long,URL>> serviceEntry : services.entrySet()) {
            String service=serviceEntry.getKey();
            if (Tool.getInterface(service).equals(url.getServiceInterface()) && (Constants.ANY_VALUE.equals(group) || StringUtils.isEquals(group,Tool.getGroup(service))) && (Constants.ANY_VALUE.equals(version) || StringUtils.isEquals(version,Tool.getVersion(service)))) {
              services.remove(service);
            }
          }
        }
      }
    }
 else {
      Map<String,Map<Long,URL>> services=categories.get(category);
      if (services == null) {
        services=new HashMap<String,Map<Long,URL>>();
        categories.put(category,services);
      }
      String service=url.getServiceKey();
      Map<Long,URL> ids=services.get(service);
      if (ids == null) {
        ids=new HashMap<Long,URL>();
        services.put(service,ids);
      }
      ids.put(ID.incrementAndGet(),url);
    }
  }
  for (  Map.Entry<String,Map<String,Map<Long,URL>>> categoryEntry : categories.entrySet()) {
    String category=categoryEntry.getKey();
    ConcurrentMap<String,Map<Long,URL>> services=registryCache.get(category);
    if (services == null) {
      services=new ConcurrentHashMap<String,Map<Long,URL>>();
      registryCache.put(category,services);
    }
    services.putAll(categoryEntry.getValue());
  }
}

Fixed version (ground truth):
public void notify(List<URL> urls){
  if (urls == null || urls.isEmpty()) {
    return;
  }
  final Map<String,Map<String,Map<Long,URL>>> categories=new HashMap<String,Map<String,Map<Long,URL>>>();
  String interfaceName=null;
  for (  URL url : urls) {
    String category=url.getParameter(Constants.CATEGORY_KEY,Constants.PROVIDERS_CATEGORY);
    if (Constants.EMPTY_PROTOCOL.equalsIgnoreCase(url.getProtocol())) {
      ConcurrentMap<String,Map<Long,URL>> services=registryCache.get(category);
      if (services != null) {
        String group=url.getParameter(Constants.GROUP_KEY);
        String version=url.getParameter(Constants.VERSION_KEY);
        if (!Constants.ANY_VALUE.equals(group) && !Constants.ANY_VALUE.equals(version)) {
          services.remove(url.getServiceKey());
        }
 else {
          for (          Map.Entry<String,Map<Long,URL>> serviceEntry : services.entrySet()) {
            String service=serviceEntry.getKey();
            if (Tool.getInterface(service).equals(url.getServiceInterface()) && (Constants.ANY_VALUE.equals(group) || StringUtils.isEquals(group,Tool.getGroup(service))) && (Constants.ANY_VALUE.equals(version) || StringUtils.isEquals(version,Tool.getVersion(service)))) {
              services.remove(service);
            }
          }
        }
      }
    }
 else {
      if (StringUtils.isEmpty(interfaceName)) {
        interfaceName=url.getServiceInterface();
      }
      Map<String,Map<Long,URL>> services=categories.get(category);
      if (services == null) {
        services=new HashMap<String,Map<Long,URL>>();
        categories.put(category,services);
      }
      String service=url.getServiceKey();
      Map<Long,URL> ids=services.get(service);
      if (ids == null) {
        ids=new HashMap<Long,URL>();
        services.put(service,ids);
      }
      if (URL_IDS_MAPPER.containsKey(url.toFullString())) {
        ids.put(URL_IDS_MAPPER.get(url.toFullString()),url);
      }
 else {
        long currentId=ID.incrementAndGet();
        ids.put(currentId,url);
        URL_IDS_MAPPER.putIfAbsent(url.toFullString(),currentId);
      }
    }
  }
  if (categories.size() == 0) {
    return;
  }
  for (  Map.Entry<String,Map<String,Map<Long,URL>>> categoryEntry : categories.entrySet()) {
    String category=categoryEntry.getKey();
    ConcurrentMap<String,Map<Long,URL>> services=registryCache.get(category);
    if (services == null) {
      services=new ConcurrentHashMap<String,Map<Long,URL>>();
      registryCache.put(category,services);
    }
 else {
      Set<String> keys=new HashSet<String>(services.keySet());
      for (      String key : keys) {
        if (Tool.getInterface(key).equals(interfaceName) && !categoryEntry.getValue().entrySet().contains(key)) {
          services.remove(key);
        }
      }
    }
    services.putAll(categoryEntry.getValue());
  }
}