[Solved]1.12.2 EntityPlayerSP can't be cast to EntityPlayer.MP

[CrashDbo]

I have recently began to learn to mod using Forge. I am in the process of learning about dimension travel and I ran into a problem with the code I picked out of MCJTY's dimension tutorial.

I am having trouble finding out how to make the code I have work. There seems to be a bit of knowledge I have missed as I don't understand why I am unable to cast the player to a server instance.

 

Any insight and on why this error and crash is is happening will help tremendously.

 

My two main files for the staff that has a right-click event that triggers the teleportation and the teleportation class are in my pastebin below.

ItemStaff.java

https://pastebin.com/Xx9SN6xx

 

DimTeleporter.java      Error on line 43

https://pastebin.com/cqxCgaF8

 

Here is the CrashLog

crash-2019-04-07_15.14.56-client.txt

Edited April 8, 2019 by CrashDbo

[DavidM]

EntityPlayerSP is not EntityPlayerMP. You cannot cast from one to another.

 

if (player.world.isRemote) {
            EntityPlayerMP entityPlayerMP = (EntityPlayerMP) player; //Game crashes here can't cast EntityPlayerSP to EntityPlayerMP

The if statement here will only be true on the client side, thus the player is SP, not MP.

Are you sure you didn't meant:

if (!player.world.isRemote)

?

Edited April 8, 2019 by DavidM

[CrashDbo]

This solved the issue. I must have misunderstood what isRemote is. Thank you for the response. Definitely need to do more research.

[DavidM]

1 hour ago, CrashDbo said:

I must have misunderstood what isRemote is.

In simple words, World#isRemote returns true on the logical client side and false on the logical server side.

In your case, you want the code to run on the server side, thus you should check if World#isRemote is false.

 

To learn more on sides, check out: https://mcforge.readthedocs.io/en/latest/concepts/sides/

The page also covers World#isRemote.

Edited April 8, 2019 by DavidM