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Problem Reloading Genmodel. `<>` operator is not allowed for source level below 1.7 [message #1791098]

Fri, 22 June 2018 19:39

Matthew Janssen

Messages: 5
Registered: June 2018

Junior Member

Eclipse Version: Oxygen.3 (4.7.3) M20180301-0715
EMF Plugin Version 2.13.0.v20170609-0928

I'm getting an error when I try to reload the genmodel for my code. The error says that there was a problem while parsing a Java file. The problem being that the `<>` operator is not allowed for source level below 1.7. But I can't figure out why it thinks I'm on Java 1.6 or below.

Within Eclipse I right click on the .genmodel > Reload... Then hitting Next causes the error to occur. I'm not sure what I'm doing wrong or what other configuration I'm missing. The maven project is set to Java 1.7 compliance. I'm using a Java 8 jdk in my Eclipse workspace. And the EMF genmodel is set to Java 1.7 compliance. Is there anything else that I'm missing?

I've attached screenshots of the problems and a text file with the full stack trace.
I've also built a small example project[1] in which I'm able to recreate the issue. If the `AnotherClass` file is commented out or type arguments are added to the ArrayList<> then the genmodel reloads just fine.

Any pointers on how to fix this would be appreciated.

[1]: https://github.com/mttjj/emf-example

Attachment: DiagnosticException.text
(Size: 5.79KB, Downloaded 187 times)
Attachment: 2018-06-22 14_19_40-Event Details.png
(Size: 24.48KB, Downloaded 191 times)
Attachment: 2018-06-22 14_19_57-Event Details.png
(Size: 51.88KB, Downloaded 302 times)

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Re: Problem Reloading Genmodel. `<>` operator is not allowed for source level below 1.7 [message #1791472 is a reply to message #1791098]

Sat, 30 June 2018 07:11

Ed Merks

Messages: 33133
Registered: July 2009

Senior Member

Sorry, this won't even work with EMF 2.14 either. Java files are currently always parsed using JDT's JLS4 (Java Language Specification level). But now there are JLS8, JLS9, and JLS10 available as well. All the older ones become deprecated so it's hard to maintain compatibility in EMF with older versions of JDT. Using reflection to pick the latest level mostly works, but some older methods on the AST throw exceptions when called in that case and that causes test failures.

In any case, there is no workaround other than not using the newer language features that cause such problems. Please open a Bugzilla and I can try to figure out how to handle this more flexibly for EMF 2.15.

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: Problem Reloading Genmodel. `<>` operator is not allowed for source level below 1.7 [message #1791488 is a reply to message #1791472]

Sat, 30 June 2018 14:00

Matthew Janssen

Messages: 5
Registered: June 2018

Junior Member

Thanks Ed.

Turns out that by the time I posted this and the time the post was approved (a week :)) I actually figured out what was going on. I had my Java Compliance level in my Eclipse preferences set to 1.6. Changing that to at least 1.7 solved the issue and I'm able to generate code even while using Java 7 features such as the diamond operator.

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Re: Problem Reloading Genmodel. `<>` operator is not allowed for source level below 1.7 [message #1791489 is a reply to message #1791488]

Sat, 30 June 2018 14:12

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Although EMF hasn't really moved on from Java 5, EMF is very resilient to higher versions. Prior to the Photon release, I briefly tried Java 10. Everything seemed fine. I only had to revert to Java 8 because of a JDT bug in the computation of a non-modular classpath for the purposes of JUnit testing. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=535067

Regards

Ed Willink

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