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How to make a generic null annotated method [message #1748668]

Sat, 26 November 2016 12:11

Frank Benoit

Messages: 179
Registered: July 2009

Senior Member

I have this:

static <A extends Annotation> @Nullable A getSomething( Class<A> annotationClass)

When i call it like this:

getSomething(MyAnnotation.class);

I get this error:
Null type safety (type annotations): The expression of type 'Class<MyAnnotation>' needs unchecked conversion to conform to 'Class<@NonNull MyAnnotation>'

I played with different variants, but I couldn't get it free of warning.

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Re: How to make a generic null annotated method [message #1748669 is a reply to message #1748668]

Sat, 26 November 2016 12:49

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

I assume you have @NonNullByDefault applying to the code in question? Otherwise I wouldn't see any issue at all.

In that case you would be seeing https://bugs.eclipse.org/477719 which was fixed as of 4.6M4. Which version are you using, could you please try a recent version?

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Re: How to make a generic null annotated method [message #1748670 is a reply to message #1748669]

Sat, 26 November 2016 13:47

Frank Benoit

Messages: 179
Registered: July 2009

Senior Member

Yes, indeed. This is specified.

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Re: How to make a generic null annotated method [message #1748671 is a reply to message #1748670]

Sat, 26 November 2016 13:48

Frank Benoit

Messages: 179
Registered: July 2009

Senior Member

I am running Version: Neon.1a Release (4.6.1)

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Re: How to make a generic null annotated method [message #1748672 is a reply to message #1748671]

Sat, 26 November 2016 14:13

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Frank Benoit wrote on Sat, 26 November 2016 14:48

I am running Version: Neon.1a Release (4.6.1)

If indeed you see the "unchecked conversion" warning still in Neon, then a bug report with a full example would be appreciated, since from what you showed so far, I cannot reproduce the problem in Neon (but could in older versions).

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Re: How to make a generic null annotated method [message #1748673 is a reply to message #1748672]

Sat, 26 November 2016 14:39

Frank Benoit

Messages: 179
Registered: July 2009

Senior Member

Hm, while trying to create this, i cannot reproduce too.
In my original code, i use aspectj nature.
http://download.eclipse.org/tools/ajdt/46/dev/update

When i add the aspectj nature to my sample project, the warning shows up.

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Re: How to make a generic null annotated method [message #1748675 is a reply to message #1748673]

Sat, 26 November 2016 14:44

Frank Benoit

Messages: 179
Registered: July 2009

Senior Member

I created a bug for AJDT
https://bugs.eclipse.org/bugs/show_bug.cgi?id=508230

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Re: How to make a generic null annotated method [message #1748710 is a reply to message #1748675]

Sun, 27 November 2016 13:13

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Great you found this.

The readme of the latest AspectJ release has this:
Quote:

The JDT compiler inside AspectJ has been upgraded to the Eclipse Mars.2 level (commit #a7bba8b1).

So for now, in any AspectJ projects you'll be missing all JDT compiler bug fixes from the Neon cycle.

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Re: How to make a generic null annotated method [message #1748711 is a reply to message #1748710]

Sun, 27 November 2016 13:50

Frank Benoit

Messages: 179
Registered: July 2009

Senior Member

OMG, this is a setback for me.
I spend so many hours on this code changes.
Thanks for this info.

Another bug I created:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=508247

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