Program: 110120
Project: 110120
Buggy source:
/** 
 * Find which plugin has a given command registered.
 * @param command the command.
 * @return the plugin.
 */
public static Plugin findByCommand(String command){
  for (  Plugin plugin : Bukkit.getPluginManager().getPlugins()) {
    Map<String,Map<String,Object>> commands=plugin.getDescription().getCommands();
    if (commands != null) {
      Iterator<Map.Entry<String,Map<String,Object>>> commandIterator=commands.entrySet().iterator();
      while (commandIterator.hasNext()) {
        Map.Entry<String,Map<String,Object>> commandNext=commandIterator.next();
        if (commandNext.getKey().equalsIgnoreCase(command)) {
          return plugin;
        }
        Iterator<Map.Entry<String,Object>> attributeIterator=commandNext.getValue().entrySet().iterator();
        while (attributeIterator.hasNext()) {
          Map.Entry<String,Object> attributeNext=attributeIterator.next();
          if (attributeNext.getKey().equals("String_Node_Str")) {
            Object aliases=attributeNext.getValue();
            if (aliases instanceof String) {
              if (((String)aliases).equalsIgnoreCase(command)) {
                return plugin;
              }
            }
 else {
              List<String> array=(List<String>)aliases;
              for (              String str : array) {
                if (str.equalsIgnoreCase(command)) {
                  return plugin;
                }
              }
            }
          }
        }
      }
    }
  }
  return null;
}

Fixed version (ground truth):
/** 
 * Find which plugin has a given command registered.
 * @param command the command.
 * @return the plugin.
 */
public static List<String> findByCommand(String command){
  List<String> plugins=new ArrayList<>();
  for (  Plugin plugin : Bukkit.getPluginManager().getPlugins()) {
    Map<String,Map<String,Object>> commands=plugin.getDescription().getCommands();
    if (commands != null) {
      Iterator<Map.Entry<String,Map<String,Object>>> commandIterator=commands.entrySet().iterator();
      while (commandIterator.hasNext()) {
        Map.Entry<String,Map<String,Object>> commandNext=commandIterator.next();
        if (commandNext.getKey().equalsIgnoreCase(command)) {
          plugins.add(plugin.getName());
          continue;
        }
        Iterator<Map.Entry<String,Object>> attributeIterator=commandNext.getValue().entrySet().iterator();
        while (attributeIterator.hasNext()) {
          Map.Entry<String,Object> attributeNext=attributeIterator.next();
          if (attributeNext.getKey().equals("String_Node_Str")) {
            Object aliases=attributeNext.getValue();
            if (aliases instanceof String) {
              if (((String)aliases).equalsIgnoreCase(command)) {
                plugins.add(plugin.getName());
                continue;
              }
            }
 else {
              List<String> array=(List<String>)aliases;
              for (              String str : array) {
                if (str.equalsIgnoreCase(command)) {
                  plugins.add(plugin.getName());
                  continue;
                }
              }
            }
          }
        }
      }
    }
  }
  return plugins;
}