[1.11.2] What is a DataFixer (related to Entities)?

[Sack Of Potatoes]

I've been having issues trying to render an entity. I believe I've narrowed the issue down to either my custom item class or my custom entity class. So I've been looking at the EntitySnowball.java as a reference. The only difference I see is the snowball entity class has a method that registers a data fix to the snowball. Can someone explain what "registerFixesThrowable()" does and what a DataFixer is and its purpose?

 

// In EntitySnowball.java
public static void registerFixesSnowball(DataFixer fixer)
{
	EntityThrowable.registerFixesThrowable(fixer, "Snowball");
}

 

But funny enough, if you look inside EntityThrowable.java to see the "registerFixesThrowable()" method, it's empty...

 

// In EntityThrowable.java
public static void registerFixesThrowable(DataFixer fixer, String name)
{
}

 

 

I was confused by this but I decided to look up the call hierarchy for "registerFixesSnowball()". And "registerFixesSnowball()" gets called in DataFixesManager.java which calls a LOT of other entity fixes (which I will remove from the code block for readability purposes).

 

// In DataFixesManager.java
public static DataFixer createFixer()
    {
        DataFixer datafixer = new DataFixer(922);
        datafixer = new net.minecraftforge.common.util.CompoundDataFixer(datafixer);
        WorldInfo.registerFixes(datafixer);
        EntityPlayerMP.func_191522_a(datafixer);
        EntityPlayer.registerFixesPlayer(datafixer);
        AnvilChunkLoader.registerFixes(datafixer);
        ItemStack.registerFixes(datafixer);
        Template.registerFixes(datafixer);
        Entity.registerFixes(datafixer);
        EntityArmorStand.registerFixesArmorStand(datafixer);
	// ...
        EntitySnowball.registerFixesSnowball(datafixer);
	// ...
        registerFixes(datafixer);
        return datafixer;
    }

 

 

This "createFixer()" gets called in "main()" method of MinecraftServer.java and in the CONSTRUCTOR of Minecraft.java

Edited March 28, 2017 by Sack Of Potatoes

[Sack Of Potatoes]

23 hours ago, diesieben07 said:

DataFixers are basically converters for old save formats. They convert the old NBT data to the new format when you load an old world.

 

As for your error: Show your entity, your renderer and where you register them.

 

I have a thread for the issue here. The renderer is called in client.java preinit() and everything else is in the commonproxy