I just started trying to develop a sanity system for my mod, but the following has been giving me 2 errors in my event class:

 

@SubscribeEvent
    public static void onAttachCapabilitiesPlayer(AttachCapabilitiesEvent<Entity> event) {
        if(event.getObject() instanceof Player) {
            if(!event.getObject().getCapability(PlayerSanityProvider.PLAYER_SANITY).isPresent()) {
                event.addCapability(new ResourceLocation(CorridorsBackrooms.MOD_ID, "properties"), new PlayerSanityProvider());
            }
        }
    }

The errors:

Inconvertible types; cannot cast 'javax.swing.text.html.parser.Entity' to 'net.minecraft.world.entity.player.Player'

And:

Cannot resolve method 'getCapability' in 'Entity'

I was told that this meant that I imported the wrong entity class, the world class Player instead of the entity class Player. Basically I'm asking how I can import the entity class Player to this event class, or at least why it hadn't been imported in the first place

From the subtitle of this forum:

Quote

Modder Support

This is the support section for those modding with Forge. Help with modding goes in here, however, please keep in mind that this is not a Java school. You are expected to have basic knowledge of Java before posting here.

You should not be posting compiler errors here. You should know how to read and understand these errors and fix your code.

If you don't, buy a java book or whatever you need to learn the language.

 

The clue (as they say) is in the question.

Quote

cannot cast 'javax.swing.text.html.parser.Entity' to 'net.minecraft.world.entity.player.Player'

Do you think Minecraft's player class has any relation to Swing's html parser?

The fix is obviously to replace that import with Minecraft's Entity class instead (as somebody already told you).