World#isBlockLoaded Attempted to load class net/minecraft/client/multiplayer/WorldClient for invalid side SERVER

[Corey]

I'm having an issue where my (client-only) packet handler is failing on the server.  I've narrowed it down to the world.isBlockLoaded if statement, but I can't figure out why this is an issue or what to do about it.

CHANNEL.registerMessage(PacketSyncEnergyNetwork.Handler.class, PacketSyncEnergyNetwork.class, id++, Side.CLIENT);

  public static class Handler implements IMessageHandler<PacketSyncEnergyNetwork, IMessage> {
    @Nullable
    @Override
    public IMessage onMessage(final PacketSyncEnergyNetwork message, final MessageContext ctx) {
      Minecraft.getMinecraft().addScheduledTask(() -> {
        for(final Long2FloatMap.Entry entry : message.state.entries()) {
          final long serialized = entry.getLongKey();
          final float energy = entry.getFloatValue();

          final BlockPos pos = BlockPosUtils.getBlockPosFromSerialized(serialized);

          final World world = Minecraft.getMinecraft().world;

          if(world.isBlockLoaded(pos)) {
            //
          }
        }
      });

      return null;
    }
  }

 

[Corey]

I figured that was probably the case, but I have another handler that does this... shouldn't it fail too, since it's accessing the client's world in the same way?

  public static class Handler implements IMessageHandler<PacketUpdateHeatNeighbours, IMessage> {
    @Override
    @Nullable
    public IMessage onMessage(final PacketUpdateHeatNeighbours packet, final MessageContext ctx) {
      Minecraft.getMinecraft().addScheduledTask(() -> {
        final TileEntity te = Minecraft.getMinecraft().world.getTileEntity(packet.entityPos);

        if(!(te instanceof HeatSinker)) {
          return;
        }

        ((HeatSinker)te).updateSink(packet.updatePos);
      });

      return null;
    }
  }

 

[Corey]

It's referencing client-only classes, but still loads and functions properly on the server.  Shouldn't it throw a similar exception to my first post when it tries to load those classes?

Edited December 27, 2018 by Corey

[Corey]

Okay, thank you