[1.7.10] how to set a new respawn point?

hey guys,i'm trying to make a block and when click right button on it ,i can set the current location as respawn point.

here is my code

  public boolean onBlockActivated(World p_149727_1_, int x, int y, int z, EntityPlayer player, int p_149727_6_, float p_149727_7_, float p_149727_8_, float p_149727_9_)

    {

player.setSpawnChunk(player.playerLocation, true);

player.addChatComponentMessage(new ChatComponentTranslation("tile.bed.occupied", new Object[0]));

        return true;

    }

but it doesn't work.  please help me, thank you!