Use Java 7 APIs and language features

[gaul]

Found via error-prone and Modernizer.

[eolivelli]

Overall okay.
But I think we should not add that plugin here, let's see opinions from the community

[Tibor17]

@gaul
You don't want to add the commit from #17 ?
I think it's all the Java 7 stuff.

[gaul]

I think of #17 as separate since it is language vs. APIs but I can combine them if you prefer.

[Tibor17]

@gaul We made the same changes in Surefire due to the changes in API are introduced in J7. So yes, the J7 has something new in language and API too but it is acceptable by Java compiler.

[gaul]

Done.

[gaul]

Addressed all outstanding suggestions.

[Tibor17]

LGTM
This work is worth a Jira ticket.
@gaul
You will find the Jira URL in the POM. Pls login there and publish a new ticket with the same name of this PR. Then it would be a complete work.
Thx, and it's a good job in real!

[Tibor17]

Jira ticket created https://issues.apache.org/jira/browse/MPLUGIN-354
Let's check this fix on Jenkins tomorrow.

[gaul]

I created MPLUGIN-353 earlier.

[Tibor17]

@gaul
ok, i will delete mine. Can you rewrite the commit message to:
[MPLUGIN-353] Use Java 7 APIs and language features
Thx

[Tibor17]

@gaul
@eolivelli
The build is currently running on Jenkins https://builds.apache.org/job/maven-box/job/maven-plugin-tools/job/MPLUGIN-353/

[Tibor17]

@gaul
I am going to push this PR to master. If you want us to cut a new release version 3.6.1 force us on the mailing list for developer. Meanwhile we will wait for new fixes.

[Tibor17]

closing as merged