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[1.6.4][SOLVED] (Coremod) ClassCastException: EntityClientPlayerMP to Player

FlameAtronach93

By FlameAtronach93
in Modder Support

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FlameAtronach93 Stone Miner

FlameAtronach93

Posted
Posted

Hello there.

 

My coremod's generating a fairly unrelated exception that I cannot find the cause of:

 

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I am not modifying either of the two classes, but several piston related classes. Without the mod, everything runs just fine. On a side note, I don't even exactly understand how it is possible to cast net.minecraft.client.entity.EntityClientPlayerMP to cpw.mods.fml.common.network.Player...

 

The exception arises when attempting to load an existing or create a new world. I am able to load up the main menu.

 

I recall that I had this error before, but I do not remember how I fixed it. What could be the cause of this?

Since I have no idea where the error originates in, I don't want to overflow this post with loads of source code. If you need any more information or code, feel free to ask.

 

Any leads are appreciated.

 

Sincerely

 

 

Update: Even with class transforming disabled (getASMTransformerClass() returning an empty array) I still get this error... On the strange side, another coremod I had developed earlier still works without any issues. The funny thing being that that coremod served as the basis of the current one, most files having been copied over, slightly changed and renamed.

 

 

Following is the crash log:

 

  Reveal hidden contents

 

 

 

Solution:

 

Due to runtime deobfuscation, do not attempt to load a Minecraft class ahead of time, not even for detecting whether you're in a deobfuscated development environment. Instead, use 

Launch.blackboard.get("fml.deobfuscatedEnvironment")

.

 

Source:

  On 5/12/2014 at 1:10 PM, diesieben07 said:

Can't see anything too wrong, except your "debug-mode" detection. It's broken and will always detect being in debug mode, even if you're not. That is because FML deobfuscates classnames at runtime. Use 

Launch.blackboard.get("fml.deobfuscatedEnvironment")

instead.

Loading the World class this early in the game launching process might cause some issues, so try and remove it.

coolAlias Reality Controller

coolAlias

Posted
Posted

The exception is occurring in a custom packet 250; do you send any packets in your mod? If so, you may want to check that your packets and handling thereof.

 

I don't currently have Eclipse open, so this is just speculation, but if I remember correctly, cpw's Player class is used when sending a packet from the server to the client and is only ever cast from the server player entity (EntityPlayerMP), but somehow you have a packet that is trying to cast from the client player, as though you are trying to send a packet to the client from the client.

FlameAtronach93 Stone Miner

FlameAtronach93

Posted
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Posted
  On 5/12/2014 at 3:45 AM, coolAlias said:

The exception is occurring in a custom packet 250; do you send any packets in your mod? If so, you may want to check that your packets and handling thereof.

 

I don't currently have Eclipse open, so this is just speculation, but if I remember correctly, cpw's Player class is used when sending a packet from the server to the client and is only ever cast from the server player entity (EntityPlayerMP), but somehow you have a packet that is trying to cast from the client player, as though you are trying to send a packet to the client from the client.

 

While that may explain when cpw's Player is used, it still doesn't help me at all. The exception occurs even in the "purest" form of my mod, i.e. when everything is commented out. Moreover, the only thing I'm currently doing in the mod is make changes to several piston related classes, such as TileEntityPiston and BlockPistonBase. It has nothing to do with any packets yet. That's why I'm completely clueless as to why this exception even arises...

 

I'm going to try to rewrite the code. If I'm lucky, the error just simply disappears...

 

Thanks anyway. :)

FlameAtronach93 Stone Miner

FlameAtronach93

Posted
  • Author
Posted
  On 5/12/2014 at 11:59 AM, diesieben07 said:

The Player interface is a so called "marker interface" which is applied by cpw's MarkerTransformer to the EntityPlayer class. The purpose is to allow to write code which doesn't need to interact with Minecraft code, but can still reference a player (for cross-version compatibility and easier updating).

 

So, somehow your code stops FML's transformer from being run at all, or run properly. Post some code maybe?

Thanks a lot for the deeper insight. I had figured it to happen like that.

 

As I said, I temporarily removed the ASM transformers and everything else... I previously had cpw and net.minecraftforge packages listed in transformer exclusions, so that can't be the reason. A new project with a rewritten Coremod and copied transformers seems to work. I suspect it to be some issue with the project setup...

 

I can upload all the code I have including the eclipse project to GitHub. Since I cannot quite tell where the error lies, this should be the best way. Although the "rewritten" project does work now, I'd still like to know where the error originates in so I know what to avoid in the future.

 

Here's the repo.

FlameAtronach93 Stone Miner

FlameAtronach93

Posted
  • Author
Posted
  On 5/12/2014 at 1:10 PM, diesieben07 said:

Can't see anything too wrong, except your "debug-mode" detection. It's broken and will always detect being in debug mode, even if you're not. That is because FML deobfuscates classnames at runtime. Use 

Launch.blackboard.get("fml.deobfuscatedEnvironment")

instead.

Loading the World class this early in the game launching process might cause some issues, so try and remove it.

 

I just happened to have verified that loading the World class this early indeed leads to issues. I noticed this exception which only occurred using this detection:

 

  Reveal hidden contents

 

 

What a coincidence that that class is a World event... Thank you a lot, removing this faulty detection resolved the error. :)

 

I know about the runtime deobfuscation. I actually had chosen that class as a dummy... I was going to replace it with a more suiting class later, but I'm going to stick to your proposal.

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