Program: 144268
Project: 144268
Buggy source:
/** 
 * Crafts a <a href="http://minecraft.gamepedia.com/Firework_Rocket">Firework Rocket</a> with a particular height, and firework stars. After crafting it will add the rocket to the launch queue. If there are not enough ingredients to finalise the rocket, it will not craft or add the rocket to the queue.
 * @param height  the height the rocket can travel
 * @param starIds the list of firework star IDs to include in the rocket
 * @return the result. if crafting failed it will return false, and a string message as to why it failed. if craftingsucceeded then it will return true and the ID (not session persistent) of the firework rocket
 */
@LuaFunction(isMultiReturn=true) public Object[] craftFireworkRocket(int height,ArrayList<Integer> starIds){
  if (!bufferRocket.hasFreeSpace()) {
    return new Object[]{false,"String_Node_Str"};
  }
  if (!(height >= 1 && height <= 3)) {
    return new Object[]{false,"String_Node_Str"};
  }
  if (findQtyOf(PAPER) == 0) {
    return new Object[]{false,"String_Node_Str"};
  }
  final int qty=findQtyOf(GUNPOWDER);
  if (qty < height) {
    return new Object[]{false,"String_Node_Str" + (height - qty) + "String_Node_Str"};
  }
  if (starIds.size() > (MAX_SLOTS - height - 1)) {
    return new Object[]{false,"String_Node_Str"};
  }
  for (  final Integer id : starIds) {
    if (!bufferStar.containsItemStackWithId(id)) {
      return new Object[]{false,"String_Node_Str" + id};
    }
  }
  final ArrayList<ItemStack> items=Lists.newArrayList();
  items.add(extract(PAPER));
  for (int i=0; i < height; ++i) {
    items.add(extract(GUNPOWDER));
  }
  for (  final Integer id : starIds) {
    items.add(bufferStar.getItemStackWithId(id));
  }
  final InventoryCrafting crafting=new InventoryCrafting(new Container(){
    @Override public boolean canInteractWith(    EntityPlayer player){
      return true;
    }
  }
,items.size() + 1,1);
  for (int i=0; i < items.size(); ++i) {
    crafting.setInventorySlotContents(i,items.get(i));
  }
  ItemStack result=manager.findMatchingRecipe(crafting,worldObj);
  if (result == null) {
    return new Object[]{false,"String_Node_Str"};
  }
  return new Object[]{true,bufferRocket.addItemStack(result)};
}

Fixed version (ground truth):
/** 
 * Crafts a <a href="http://minecraft.gamepedia.com/Firework_Rocket">Firework Rocket</a> with a particular height, and firework stars. After crafting it will add the rocket to the launch queue. If there are not enough ingredients to finalise the rocket, it will not craft or add the rocket to the queue.
 * @param height  the height the rocket can travel
 * @param starIds the list of firework star IDs to include in the rocket
 * @return the result. if crafting failed it will return false, and a string message as to why it failed. if craftingsucceeded then it will return true and the ID (not session persistent) of the firework rocket
 */
@LuaFunction(isMultiReturn=true) public Object[] craftFireworkRocket(int height,List<Double> starIds){
  if (!bufferRocket.hasFreeSpace()) {
    return new Object[]{false,"String_Node_Str"};
  }
  if (!(height >= 1 && height <= 3)) {
    return new Object[]{false,"String_Node_Str"};
  }
  if (findQtyOf(PAPER) == 0) {
    return new Object[]{false,"String_Node_Str"};
  }
  final int qty=findQtyOf(GUNPOWDER);
  if (qty < height) {
    return new Object[]{false,"String_Node_Str" + (height - qty) + "String_Node_Str"};
  }
  if (starIds.size() > (MAX_SLOTS - height - 1)) {
    return new Object[]{false,"String_Node_Str"};
  }
  for (  final Double id : starIds) {
    int rId=id.intValue();
    if (!bufferStar.containsItemStackWithId(rId)) {
      return new Object[]{false,"String_Node_Str" + rId};
    }
  }
  final ArrayList<ItemStack> items=Lists.newArrayList();
  items.add(extract(PAPER));
  for (int i=0; i < height; ++i) {
    items.add(extract(GUNPOWDER));
  }
  for (  final Double id : starIds) {
    items.add(bufferStar.getItemStackWithId(id.intValue()));
  }
  final InventoryCrafting crafting=new InventoryCrafting(new Container(){
    @Override public boolean canInteractWith(    EntityPlayer player){
      return true;
    }
  }
,items.size() + 1,1);
  for (int i=0; i < items.size(); ++i) {
    crafting.setInventorySlotContents(i,items.get(i));
  }
  ItemStack result=manager.findMatchingRecipe(crafting,worldObj);
  if (result == null) {
    return new Object[]{false,"String_Node_Str"};
  }
  return new Object[]{true,bufferRocket.addItemStack(result)};
}