Program: 18030
Project: 18030
Buggy source:
public void tempBan(){
  PlayerTempBanEvent tBanEvent=new PlayerTempBanEvent(playerName,playerIP,senderName,reason,duration,measure);
  plugin.getServer().getPluginManager().callEvent(tBanEvent);
  if (tBanEvent.isCancelled()) {
    return;
  }
  senderName=tBanEvent.getSenderName();
  reason=tBanEvent.getReason();
  duration=tBanEvent.getDuration();
  measure=tBanEvent.getMeasure();
  JsonHandler webHandle=new JsonHandler(plugin);
  HashMap<String,String> url_items=new HashMap<String,String>();
  url_items.put("String_Node_Str",playerName);
  url_items.put("String_Node_Str",playerIP);
  url_items.put("String_Node_Str",reason);
  url_items.put("String_Node_Str",senderName);
  url_items.put("String_Node_Str",duration);
  url_items.put("String_Node_Str",measure);
  if (actionData != null) {
    url_items.put("String_Node_Str",actionData.toString());
  }
  url_items.put("String_Node_Str","String_Node_Str");
  HashMap<String,String> response=webHandle.mainRequest(url_items);
  try {
    if (response.containsKey("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + "String_Node_Str" + response.get("String_Node_Str"));
      return;
    }
    if (!response.containsKey("String_Node_Str")) {
      bukkitBan();
      return;
    }
    if (response.get("String_Node_Str").equals("String_Node_Str")) {
      this.kickPlayer(playerName,_("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
      Util.broadcastMessage(ChatColor.GREEN + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
      plugin.getServer().getPluginManager().callEvent(new PlayerBannedEvent(playerName,playerIP,senderName,reason,action_id,duration,measure));
      log.info(playerName + "String_Node_Str" + reason+ "String_Node_Str"+ senderName+ "String_Node_Str");
      return;
    }
 else     if (response.get("String_Node_Str").equals("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
    }
 else     if (response.get("String_Node_Str").equals("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
    }
 else     if (response.get("String_Node_Str").equals("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
    }
    log.info(senderName + "String_Node_Str" + playerName+ "String_Node_Str"+ reason+ "String_Node_Str");
  }
 catch (  Exception ex) {
    bukkitBan();
    log.warning("String_Node_Str");
    ex.printStackTrace();
  }
}

Fixed version (ground truth):
public void tempBan(){
  PlayerTempBanEvent tBanEvent=new PlayerTempBanEvent(playerName,playerIP,senderName,reason,duration,measure);
  plugin.getServer().getPluginManager().callEvent(tBanEvent);
  if (tBanEvent.isCancelled()) {
    return;
  }
  senderName=tBanEvent.getSenderName();
  reason=tBanEvent.getReason();
  duration=tBanEvent.getDuration();
  measure=tBanEvent.getMeasure();
  JsonHandler webHandle=new JsonHandler(plugin);
  HashMap<String,String> url_items=new HashMap<String,String>();
  url_items.put("String_Node_Str",playerName);
  url_items.put("String_Node_Str",playerIP);
  url_items.put("String_Node_Str",reason);
  url_items.put("String_Node_Str",senderName);
  url_items.put("String_Node_Str",duration);
  url_items.put("String_Node_Str",measure);
  if (actionData != null) {
    url_items.put("String_Node_Str",actionData.toString());
  }
  url_items.put("String_Node_Str","String_Node_Str");
  HashMap<String,String> response=webHandle.mainRequest(url_items);
  try {
    if (response.containsKey("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + "String_Node_Str" + response.get("String_Node_Str"));
      return;
    }
    if (!response.containsKey("String_Node_Str")) {
      bukkitBan();
      return;
    }
    if (response.get("String_Node_Str").equals("String_Node_Str")) {
      this.kickPlayer(playerName,_("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
      Util.broadcastMessage(ChatColor.GREEN + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
      plugin.getServer().getPluginManager().callEvent(new PlayerBannedEvent(playerName,playerIP,senderName,reason,action_id,duration,measure));
      log.info(playerName + "String_Node_Str" + reason+ "String_Node_Str"+ senderName+ "String_Node_Str");
      return;
    }
 else     if (response.get("String_Node_Str").equals("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
    }
 else     if (response.get("String_Node_Str").equals("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
    }
 else     if (response.get("String_Node_Str").equals("String_Node_Str")) {
      Util.message(senderName,ChatColor.DARK_RED + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
    }
 else     if (response.get("String_Node_Str").equals("String_Node_Str")) {
      if (response.get("String_Node_Str") != null) {
        Util.message(senderName,ChatColor.DARK_RED + response.get("String_Node_Str"));
      }
 else {
        Util.message(senderName,ChatColor.DARK_RED + _("String_Node_Str",I18n.PLAYER,playerName,I18n.SENDER,senderName,I18n.REASON,reason,I18n.PLAYERIP,playerIP));
      }
    }
    log.info(senderName + "String_Node_Str" + playerName+ "String_Node_Str"+ reason+ "String_Node_Str");
  }
 catch (  Exception ex) {
    bukkitBan();
    log.warning("String_Node_Str");
    ex.printStackTrace();
  }
}