Program: 157087
Project: 157087
Buggy source:
/** 
 */
@Override public WrappedStack deserialize(JsonElement jsonElement,Type type,JsonDeserializationContext context) throws JsonParseException {
  if (!jsonElement.isJsonPrimitive()) {
    JsonObject jsonWrappedStack=(JsonObject)jsonElement;
    int stackSize=-1;
    String className=null;
    Object stackObject=null;
    if (jsonWrappedStack.get("String_Node_Str") != null) {
      className=jsonWrappedStack.get("String_Node_Str").getAsString();
    }
    if (jsonWrappedStack.get("String_Node_Str") != null) {
      stackSize=jsonWrappedStack.get("String_Node_Str").getAsInt();
    }
    if (jsonWrappedStack.get("String_Node_Str") != null && !jsonWrappedStack.get("String_Node_Str").isJsonPrimitive()) {
      if (className != null) {
        if (className.equalsIgnoreCase(ItemStack.class.getSimpleName())) {
          Gson gsonItemStackSerializer=(new GsonBuilder()).registerTypeAdapter(ItemStack.class,new GsonItemStackSerialization()).create();
          ItemStack itemStack=gsonItemStackSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),ItemStack.class);
          if (stackSize > 0) {
            itemStack.stackSize=stackSize;
          }
          stackObject=itemStack;
        }
 else         if (className.equalsIgnoreCase(OreStack.class.getSimpleName())) {
          OreStack oreStack=gsonSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),OreStack.class);
          if (stackSize > 0) {
            oreStack.stackSize=stackSize;
          }
          stackObject=oreStack;
        }
 else         if (className.equalsIgnoreCase(EnergyStack.class.getSimpleName())) {
          EnergyStack energyStack=gsonSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),EnergyStack.class);
          if (stackSize > 0) {
            energyStack.stackSize=stackSize;
          }
          stackObject=energyStack;
        }
 else         if (className.equalsIgnoreCase(FluidStack.class.getSimpleName())) {
          FluidStack fluidStack=gsonSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),FluidStack.class);
          if (stackSize > 0) {
            fluidStack.amount=stackSize;
          }
          stackObject=fluidStack;
        }
      }
    }
    if (stackObject != null) {
      return new WrappedStack(stackObject);
    }
 else {
      throw new JsonParseException(String.format("String_Node_Str",jsonElement.toString()));
    }
  }
 else {
    throw new JsonParseException(String.format("String_Node_Str",jsonElement.toString()));
  }
}

Fixed version (ground truth):
/** 
 */
@Override public WrappedStack deserialize(JsonElement jsonElement,Type type,JsonDeserializationContext context) throws JsonParseException {
  if (!jsonElement.isJsonPrimitive()) {
    JsonObject jsonWrappedStack=(JsonObject)jsonElement;
    int stackSize=-1;
    String className=null;
    Object stackObject=null;
    if (jsonWrappedStack.get("String_Node_Str") != null) {
      className=jsonWrappedStack.get("String_Node_Str").getAsString();
    }
    if (jsonWrappedStack.get("String_Node_Str") != null) {
      stackSize=jsonWrappedStack.get("String_Node_Str").getAsInt();
    }
    if (jsonWrappedStack.get("String_Node_Str") != null && !jsonWrappedStack.get("String_Node_Str").isJsonPrimitive()) {
      if (className != null) {
        if (className.equalsIgnoreCase(ItemStack.class.getSimpleName())) {
          ItemStack itemStack=gsonSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),ItemStack.class);
          if (stackSize > 0) {
            itemStack.stackSize=stackSize;
          }
          stackObject=itemStack;
        }
 else         if (className.equalsIgnoreCase(OreStack.class.getSimpleName())) {
          OreStack oreStack=gsonSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),OreStack.class);
          if (stackSize > 0) {
            oreStack.stackSize=stackSize;
          }
          stackObject=oreStack;
        }
 else         if (className.equalsIgnoreCase(EnergyStack.class.getSimpleName())) {
          EnergyStack energyStack=gsonSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),EnergyStack.class);
          if (stackSize > 0) {
            energyStack.stackSize=stackSize;
          }
          stackObject=energyStack;
        }
 else         if (className.equalsIgnoreCase(FluidStack.class.getSimpleName())) {
          FluidStack fluidStack=gsonSerializer.fromJson(jsonWrappedStack.get("String_Node_Str"),FluidStack.class);
          if (stackSize > 0) {
            fluidStack.amount=stackSize;
          }
          stackObject=fluidStack;
        }
      }
    }
    if (stackObject != null) {
      return new WrappedStack(stackObject);
    }
 else {
      throw new JsonParseException(String.format("String_Node_Str",jsonElement.toString()));
    }
  }
 else {
    throw new JsonParseException(String.format("String_Node_Str",jsonElement.toString()));
  }
}