Scala signature package has wrong version expected: 5.0 found: 5.2

[Aleksey Gruba]

Hi, 

I would like to try Gatling and started with maven plugin in Intellij IDEA (gatling/gatling-maven-plugin-demo: Showcase of the Gatling Plugin for Maven (github.com)). When I run Engine class, there are lots of errors like this one:

scalac: error while loading package, class file '<current_user>\.m2\repository\io\gatling\gatling-app\3.5.1\gatling-app-3.5.1.jar(io/gatling/app/package.class)' is broken 

 (class java.lang.RuntimeException/error reading Scala signature of package.class: Scala signature package has wrong version

 expected: 5.0

 found: 5.2 in package.class)

As far as I understand it means that the gatling classes were compiled with higher version of scala compiler (5.2) than current scalac expects.

I use latest gatling (3.5.1) and Scala SDK 2.12.12. There was no previous installation of Scala SDK (it's my first experience with Scala at all). 

What could be a reason for these errors? 

Thanks!

Best regards, 

Aleksey. 

[Sébastien BREVET]

Hi,

Indeed, the "Installation" prerequisites documentation is misleading. (Note to self, creating a ticket about that)

3.5.0 introduced the migration to scala 2.13.

So, you have to use scala 2.13 (`2.13.5` is the latest release)

Cheers!

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Sébastien BREVET Backend engineer site: gatling.io

[Aleksey Gruba]

Yeap, it works as expected with SDK 2.13.5. 

Thanks for help! It's good that we have found a bug in the docs :)