Why doesn't @NotNull anotation remove the warning?

Question

I wrote a class that implements a comparable interface. I used annotation @NotNullto suppress waring in the method parameter. But he still shows a warning. The IDE automatically imports this package com.sun.istack.internal.NotNullfor @NotNull. Why is this so? Without using this annotation, how to remove this warning?
I am using Inteij Ultimate with java 8 SE. Here is my code snippet.

Thank.

Answer 1

Apparently you should use

public int compareTo(@NonNull Node node) {

instead

public int compareTo(@NotNull Node node) {

The compiler can detect cases where the code path can be zero, without having to debug NullPointerException.

From here.

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Answer 2

, com.intellij.annotations.NotNull, javax.annotation.Nonnull javax.validation.constraints.NotNull.

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