Fix no check if the parameter is null.

[JokerSun]

#6773 (comment)

[pivotal-issuemaster]

@JokerSun Please sign the Contributor License Agreement!

Click here to manually synchronize the status of this Pull Request.

See the FAQ for frequently asked questions.

[pivotal-issuemaster]

@JokerSun Thank you for signing the Contributor License Agreement!

[jzheaux]

@JokerSun, thanks for such a quick turnaround! I've left some feedback inline.

[JokerSun]

@jzheaux Thanks for your review, i guess your are right , and can you make some suggestion about strategy of 'null value' it's import for my developing, because i don't know when should i catch the null value or throw exception.

[jzheaux]

Thanks, @JokerSun for the update!

To answer your question about checking for null, remember that the more possible inputs you allow, the more you have to support. Ask yourself if it would be a normal use case to pass a null value to your method - if not, throw an IllegalArgumentException.

Regarding your PR, will you please do some cleanup before it gets merged? It looks like there are five commits, but only one line changed. Can you make so that there is only one commit? And then please format the commit this way:

AuthorityUtils Null Check

Fixes: gh-6773

Thanks!

[JokerSun]

@jzheaux I am sorry about reply later, i have clean the commits, and thanks for your suggestion very much.

[jzheaux]

Thanks, again, @JokerSun! This has been merged into master.