In which cases I should use @Nullable annotation?

Question

I investigate guava library for java.

reading different materials I faced with @Nullable annotation.

I added guava jar file to classpath but my IDE(eclipse) say:

Nullable cannot be resolved to a type

But if I ctrl + click on Nullable I see blue underline and see next after:

source not found

maybe it is problem with eclipse - I don't know and this annotation located in another location.

But additionally I cannot understand situation when I should to use this annotation.

score 3 · Accepted Answer · edited May 23 '17 at 12:06

3

It is in here.

javax.annotation.Nullable

I think you need this jar: jsr305.jar.

See also:

Regarding when you should use it - check this link.

edited May 23 '17 at 12:06

Community

answered Jan 09 '14 at 11:23

peter.petrov

usage is clearly now - thanks. – gstackoverflow Jan 09 '14 at 11:27
But I cannot understand why my IDE doesn't see this annotation. I need add something to classpath? – gstackoverflow Jan 09 '14 at 11:28
I upvoted it for the good link – Keerthivasan Jan 09 '14 at 11:28
@gstackoverflow Yes, I think you need jsr305.jar on your classpath, as I mentioned. – peter.petrov Jan 09 '14 at 11:29
Use maven for dependency management. It's quite easy today with Eclipse. It'll take care of all transitive dependencies and you won't have to copy any jars anywhere. – allprog Jan 09 '14 at 11:50

1 Answers1