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Save capability forge 1.12


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Hello guys, i've starting to code in java for dev some mods and in my first mod i try to save player first connection on the server. Since now i did a system with capability which is working perfectly but i can't manage the capability saving problem when i restart the server. I did my capability register but it's looks deprecated, it could be the issue ? 



public class CommonProxy {
    public void init()
        CapabilityManager.INSTANCE.register(IFirstJoin.class, new FirstJoinStorage(), FirstJoin.class);

        MinecraftForge.EVENT_BUS.register(new CapabilityHandler());
        MinecraftForge.EVENT_BUS.register(new EventHandler());
public class CapabilityHandler
    public static final ResourceLocation FIRST_JOIN_CAP = new ResourceLocation(tonation.MODID, "first_join");

    public void attachCapability(AttachCapabilitiesEvent<Entity> event)
        if (!(event.getObject() instanceof EntityPlayer)) return;

        event.addCapability(FIRST_JOIN_CAP, new FirstJoinProvider());
public class EventHandler {
    public void onPlayerLogsIn(PlayerEvent.PlayerLoggedInEvent event)
        EntityPlayer player = event.player;
        IFirstJoin first_join = player.getCapability(FirstJoinProvider.FIRST_JOIN_CAP, null);

        if(first_join.isFirstConnection() == 1){
            String message = String.format("Here is your first connection!", (int) first_join.isFirstConnection());
            player.sendMessage(new TextComponentString(message));
            player.sendMessage(new TextComponentString("Hello back bud!"));
        player.getCapability(FirstJoinProvider.FIRST_JOIN_CAP, null).setFirstJoin();


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