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Unfortunately for you, EntityPlayer#attackTargetEntityWithCurrentItem can't just be rewritten like that (unless maybe you replace the player entity completely). Many times, Forge supplies an event that does what you need. In your case, check out the very first line of attackTargetEntityWithCurrentItem. You can see that there is a Forge hook called onPlayerAttackTarget. You can hook into that event, and then do whatever you need to (possibly copying portions of the original method, possibly canceling the event when you are done with your stuff, to prevent the vanilla code from running). Basic documentation on using Forge events is here.

Thought I'd paste my final function here: public static void findRadiusBlock(Event event, int radius) { BlockPos pos = event.getEntity().getPosition(); int chunkPosX = pos.getX() >> 4; int chunkPosZ = pos.getZ() >> 4; if (!event.getWorld().isRemote) { for (int x = chunkPosX - radius; x < chunkPosX + radius; x++) { for (int z = chunkPosZ - radius; z < chunkPosZ + radius; z++) { Map<BlockPos, TileEntity> currentChunkTE = event.getWorld().getChunkFromChunkCoords(x, z).getTileEntityMap(); for (TileEntity te : currentChunkTE.values()) { if (te != null) { if (te instanceof TileEntityRadiusBlock) { myFunction(); } } } } } } }