How to check if an offline player has permission?

Plugins Plugin Development
1

Current code:
UserStorageService userStorage = Sponge.getServiceManager().provide(UserStorageService.class).get();
User user = userStorage.get(client.name).get();
if (user.hasPermission(“test.permission”)) {
System.out.println(“hit”);
}

The problem is that the code is generating a NPE on user.hasPermission(…)

2

You need to do a userStorage.get(client.name).isPresent() check before you do userStorage.get(client.name).get(). This will ensure you don’t receive an NPE. If the user is not present then do not process it.

3

But doesn’t that require the player to be online – User#isPresent

4

isPresent is from the Optional class, which is used in place of possibly returning null. There’s an explanation of it on the docs, I would link it but I am not at my PC right now.

5

Found the link if you hadn’t found it already: https://docs.spongepowered.org/master/en/plugin/optional/basic.html

6

Thanks for the information, I did in fact implement that into the code…
But I ended up fixing my problem another way, as I was looking at the wrong code.
I cannot really explain it here, as it has nothing to do with this thread, but my issue is solved.

1 Like
7

If you call get on a nonexistent value, it will throw a NoSuchElementException. Working with Optionals, you never get null, unless you specifically call orElse(null).

1 Like