Ever considered swapping to JetBrains' annotations?

[buthed010203]

They have a few nice things such as properly telling you what could cause issues, also has a @NotNull
JetBrains @Nullable:

Arc @Nullable:

[Anuken]

I don't want external dependencies or nasty long imports.

such as properly telling you what could cause issues

IntelliJ already does that if you configure it correctly.

@NotNull

Arc used to have this one, but it's redundant, because variables should be considered non-null by default.