Program: 154502
Project: 154502
Buggy source:
public void onPlayerInteract(PlayerInteractEvent event){
  if (event.getAction() == Action.LEFT_CLICK_BLOCK) {
    Player p=event.getPlayer();
    ItemStack item=p.getItemInHand();
    if (item.getType() == Material.BOW) {
      Material id=event.getClickedBlock().getType();
      Material id2=event.getClickedBlock().getRelative(0,1,0).getType();
      EnumBowMaterial bm=null;
      if (id == Material.WOOD || id == Material.LOG) {
        bm=EnumBowMaterial.STANDARD;
      }
      if (id == Material.SNOW || id == Material.ICE) {
        bm=EnumBowMaterial.ICE;
      }
      if (id2 == Material.FIRE) {
        bm=EnumBowMaterial.FIRE;
      }
      if (id == Material.TNT) {
        bm=EnumBowMaterial.TNT;
      }
      if (id == Material.REDSTONE_ORE) {
        bm=EnumBowMaterial.THUNDER;
      }
      if (id == Material.MOB_SPAWNER) {
        bm=EnumBowMaterial.MONSTER;
      }
      if (id == Material.DISPENSER) {
        bm=EnumBowMaterial.THRICE;
      }
      if (id == Material.LAPIS_BLOCK) {
        bm=EnumBowMaterial.ZOMBIE;
      }
      if (bm != null) {
        if (bm.getDataValue() == EnumBowMaterial.fromData(item.getDurability()).getDataValue()) {
          return;
        }
        item.setDurability(bm.getDataValue());
        p.sendMessage("String_Node_Str" + bm.getName() + "String_Node_Str");
      }
    }
  }
  if (event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
    Player p=event.getPlayer();
    ItemStack item=p.getItemInHand();
    if (item.getType() == Material.BOW) {
      event.setUseInteractedBlock(Result.DENY);
      event.setCancelled(true);
      EnumBowMaterial material=EnumBowMaterial.fromData(item.getDurability());
      if (!Archers.Permissions.has(p,"String_Node_Str" + material.getName().toLowerCase())) {
        return;
      }
      int has=0;
      for (      ItemStack stack : Properties.ArrowAmmo.get(material.getDataValue())) {
        int amount=0;
        for (int i=0; i < p.getInventory().getContents().length; i++) {
          if (p.getInventory().getContents()[i] == null) {
            continue;
          }
          if (p.getInventory().getContents()[i].getTypeId() == stack.getTypeId()) {
            amount+=p.getInventory().getContents()[i].getAmount();
          }
          if (amount >= stack.getAmount()) {
            ++has;
            break;
          }
        }
      }
      if (has != Properties.ArrowAmmo.get(material.getDataValue()).size())       return;
      Arrow arrow=new Arrow(p.getWorld(),p,material);
      ArrowHandler.onArrowCreate(p,arrow);
      for (      ItemStack stack : Properties.ArrowAmmo.get(material.getDataValue())) {
        CraftUpdate.removeItem(p,stack);
      }
    }
  }
}

Fixed version (ground truth):
public void onPlayerInteract(PlayerInteractEvent event){
  if (event.getAction() == Action.LEFT_CLICK_BLOCK) {
    Player p=event.getPlayer();
    ItemStack item=p.getItemInHand();
    if (item.getType() == Material.BOW) {
      Material id=event.getClickedBlock().getType();
      Material id2=event.getClickedBlock().getRelative(0,1,0).getType();
      EnumBowMaterial bm=null;
      if (id == Material.WOOD || id == Material.LOG) {
        bm=EnumBowMaterial.STANDARD;
      }
      if (id == Material.SNOW || id == Material.ICE) {
        bm=EnumBowMaterial.ICE;
      }
      if (id2 == Material.FIRE) {
        bm=EnumBowMaterial.FIRE;
      }
      if (id == Material.TNT) {
        bm=EnumBowMaterial.TNT;
      }
      if (id == Material.REDSTONE_ORE) {
        bm=EnumBowMaterial.THUNDER;
      }
      if (id == Material.MOB_SPAWNER) {
        bm=EnumBowMaterial.MONSTER;
      }
      if (id == Material.DISPENSER) {
        bm=EnumBowMaterial.THRICE;
      }
      if (id == Material.LAPIS_BLOCK) {
        bm=EnumBowMaterial.ZOMBIE;
      }
      if (bm != null) {
        if (bm.getDataValue() == EnumBowMaterial.fromData(item.getDurability()).getDataValue()) {
          return;
        }
        item.setDurability(bm.getDataValue());
        p.sendMessage(ChatColor.DARK_GREEN + "String_Node_Str" + ChatColor.YELLOW+ bm.getName()+ ChatColor.DARK_GREEN+ "String_Node_Str");
      }
    }
  }
  if (event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
    Player p=event.getPlayer();
    ItemStack item=p.getItemInHand();
    if (item.getType() == Material.BOW) {
      event.setUseInteractedBlock(Result.DENY);
      event.setCancelled(true);
      EnumBowMaterial material=EnumBowMaterial.fromData(item.getDurability());
      if (!Archers.Permissions.has(p,"String_Node_Str" + material.getName().toLowerCase())) {
        return;
      }
      int has=0;
      for (      ItemStack stack : Properties.ArrowAmmo.get(material.getDataValue())) {
        int amount=0;
        for (int i=0; i < p.getInventory().getContents().length; i++) {
          if (p.getInventory().getContents()[i] == null) {
            continue;
          }
          if (p.getInventory().getContents()[i].getTypeId() == stack.getTypeId()) {
            amount+=p.getInventory().getContents()[i].getAmount();
          }
          if (amount >= stack.getAmount()) {
            ++has;
            break;
          }
        }
      }
      if (has != Properties.ArrowAmmo.get(material.getDataValue()).size()) {
        p.sendMessage(ChatColor.RED + "String_Node_Str");
        return;
      }
      Arrow arrow=new Arrow(p.getWorld(),p,material);
      ArrowHandler.onArrowCreate(p,arrow);
      for (      ItemStack stack : Properties.ArrowAmmo.get(material.getDataValue())) {
        CraftUpdate.removeItem(p,stack);
      }
    }
  }
}