CODEWITHSUNDEEP
javaannotationswarningsnotnull
seal
seal

Reputation: 1143

Why not @NotNull anotation remove the warning?

I have wrote a class that implements the comparable interface. I used @NotNull annotation to suppress the waring in the method parameter. But it still shows a warning.The IDE automatically import this package com.sun.istack.internal.NotNull for the @NotNull. Why this is happing? Without using this annotation how to remove this warning ?
I am using Inteij Ultimate with java 8 SE. Here is my code snippet.enter image description here

Thank you.

Upvotes: 4

Views: 3877

Answers (2)

Olivier Poulin
Olivier Poulin

Reputation: 1796

Apparently, you should be using 

public int compareTo(@NonNull Node node) {

instead of 

public int compareTo(@NotNull Node node) {

The compiler can determine cases where a code path might receive a null value, without ever having to debug a NullPointerException.

From here.

For these annotations you need Checker Framework installed. Or you can try what the other answer says.

Upvotes: 5

uraimo
uraimo

Reputation: 19821

Change your import, you can use intellij's own com.intellij.annotations.NotNull, javax.annotation.Nonnull or javax.validation.constraints.NotNull.

This is an IntelliJ feature and it was actually possible to configure which nullable/notnull annotation to use, see this guide.

If this doesn't fix it, and the message seems to imply this, try removing the @override, you are adding an annotation to a parameter that didn't have it in the super class.

Upvotes: 1

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