Program: 21877
Project: 21877
Buggy source:
public DecomposerRecipe getRecipe(ItemStack input,int level){
  for (  DecomposerRecipe recipe : DecomposerRecipe.recipes) {
    if (Util.stacksAreSameKind(input,recipe.getInput()))     return recipe;
  }
  if (level < 5) {
    ArrayList<Chemical> output=new ArrayList<Chemical>();
    int foundRecipies=0;
    for (    Object recipe : CraftingManager.getInstance().getRecipeList()) {
      if (recipe instanceof IRecipe) {
        if (((IRecipe)recipe).getRecipeOutput() != null && ((IRecipe)recipe).getRecipeOutput().isItemEqual(input)) {
          ItemStack[] components=null;
          if (recipe instanceof ShapelessOreRecipe && ((ShapelessOreRecipe)recipe).getInput().size() > 0) {
            ArrayList<ItemStack> inputs=new ArrayList<ItemStack>();
            for (            Object o : ((ShapelessOreRecipe)recipe).getInput()) {
              if (o instanceof ItemStack) {
                inputs.add((ItemStack)o);
              }
            }
            components=inputs.toArray(new ItemStack[inputs.size()]);
          }
          if (recipe instanceof ShapedOreRecipe) {
            ArrayList<ItemStack> inputs=new ArrayList<ItemStack>();
            for (            Object o : ((ShapedOreRecipe)recipe).getInput()) {
              if (o instanceof ItemStack) {
                inputs.add((ItemStack)o);
              }
 else               if (o instanceof String) {
                inputs.add(OreDictionary.getOres((String)o).get(0));
              }
 else               if (o instanceof ArrayList) {
                inputs.add((ItemStack)((ArrayList)o).get(0));
              }
 else               if (o != null) {
                System.out.println(o.getClass().getName());
              }
            }
            components=inputs.toArray(new ItemStack[inputs.size()]);
          }
          if (recipe instanceof ShapelessRecipes) {
            components=(ItemStack[])((ShapelessRecipes)recipe).recipeItems.toArray();
          }
          if (recipe instanceof ShapedRecipes) {
            components=((ShapedRecipes)recipe).recipeItems;
          }
          if (components != null) {
            ArrayList<Chemical> sum=new ArrayList<Chemical>();
            for (            ItemStack item : components) {
              if (item != null) {
                DecomposerRecipe decompRecipe=this.getRecipe(item,level + 1);
                if (decompRecipe != null) {
                  sum.addAll(decompRecipe.getOutputRaw());
                }
              }
            }
            if (!sum.isEmpty()) {
              System.out.println(8);
              Random rand=new Random();
              if (sum.containsAll(output)) {
                output=sum;
              }
 else               if (!output.containsAll(sum) && rand.nextInt(foundRecipies) == 0) {
                System.out.println(9);
                output=sum;
                foundRecipies+=1;
              }
            }
          }
        }
      }
    }
    if (!output.isEmpty()) {
      System.out.println(output);
      return new DecomposerRecipe(input,output.toArray(new Chemical[output.size()]));
    }
  }
  return null;
}

Fixed version (ground truth):
public DecomposerRecipe getRecipe(ItemStack input,int level){
  for (  DecomposerRecipe recipe : DecomposerRecipe.recipes) {
    if (Util.stacksAreSameKind(input,recipe.getInput()))     return recipe;
  }
  if (level < 5) {
    ArrayList<Chemical> output=new ArrayList<Chemical>();
    int foundRecipies=0;
    for (    Object recipe : CraftingManager.getInstance().getRecipeList()) {
      if (recipe instanceof IRecipe) {
        if (((IRecipe)recipe).getRecipeOutput() != null && ((IRecipe)recipe).getRecipeOutput().isItemEqual(input)) {
          ItemStack[] components=null;
          if (recipe instanceof ShapelessOreRecipe && ((ShapelessOreRecipe)recipe).getInput().size() > 0) {
            ArrayList<ItemStack> inputs=new ArrayList<ItemStack>();
            for (            Object o : ((ShapelessOreRecipe)recipe).getInput()) {
              if (o instanceof ItemStack) {
                inputs.add((ItemStack)o);
              }
            }
            components=inputs.toArray(new ItemStack[inputs.size()]);
          }
          if (recipe instanceof ShapedOreRecipe) {
            ArrayList<ItemStack> inputs=new ArrayList<ItemStack>();
            for (            Object o : ((ShapedOreRecipe)recipe).getInput()) {
              if (o instanceof ItemStack) {
                inputs.add((ItemStack)o);
              }
 else               if (o instanceof String) {
                inputs.add(OreDictionary.getOres((String)o).get(0));
              }
 else               if (o instanceof ArrayList) {
                inputs.add((ItemStack)((ArrayList)o).get(0));
              }
            }
            components=inputs.toArray(new ItemStack[inputs.size()]);
          }
          if (recipe instanceof ShapelessRecipes) {
            components=(ItemStack[])((ShapelessRecipes)recipe).recipeItems.toArray();
          }
          if (recipe instanceof ShapedRecipes) {
            components=((ShapedRecipes)recipe).recipeItems;
          }
          if (components != null) {
            ArrayList<Chemical> sum=new ArrayList<Chemical>();
            for (            ItemStack item : components) {
              if (item != null) {
                DecomposerRecipe decompRecipe=this.getRecipe(item,level + 1);
                if (decompRecipe != null) {
                  sum.addAll(decompRecipe.getOutputRaw());
                }
              }
            }
            if (!sum.isEmpty()) {
              Random rand=new Random();
              if (sum.containsAll(output)) {
                output=sum;
              }
 else               if (!output.containsAll(sum) && rand.nextInt(foundRecipies) == 0) {
                output=sum;
                foundRecipies+=1;
              }
            }
          }
        }
      }
    }
    if (!output.isEmpty()) {
      return new DecomposerRecipe(input,output.toArray(new Chemical[output.size()]));
    }
  }
  return null;
}