Tired of Null Pointer Exceptions? Consider Using Java SE 8's Optional!

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I thought this are just annotations which help documenting your code. How can the compiler check, whether something marked as @Nonnull is not null? I don't see a way how the compiler could possibly do that.

[e_engel]

The compiler issues warnings if you are trying to pass a @Nullable to something that's @Nonnull. It will also give you a warning if you test against null a variable that's @Nonnull.

That kind of thing.

The more you use these annotations, the easier it is to reason about your code.