Require Akka 2.5.10 and use the new version checker utility

[johanandren]

Fixes #1538

See issue for discussion if it should really be done.

[akka-ci]

Test FAILed.

[johanandren]

Ach, some issue with the @unidoc directive. No idea why it hit me here.

[johanandren]

@raboof Any clue why this happens? The paradox directive does not find akka.util.ByteString any more after the 2.5.10 upgrade (see the build fail). I have verified it is not among the class names passed to the directive.

[raboof]

@johanandren the error is Error writing content for page migration-guide/migration-from-spray.html: 2 matches found for ByteString, but not javadsl/scaladsl: akka.protobuf.ByteString, akka.util.ByteString, which means that it did find akka.util.ByteString, but it now also finds akka.protobuf.ByteString and doesn't know which one to pick.

@richardimaoka added searching by fqdn in https://github.com/akka/akka/pull/24563/files#diff-c858760d32fe74f2dcabf0ea7bc4aaecR32 , I guess we'd want to add that and use it here as well (until we move that directive to its own plugin).

[jrudolph]

@richardimaoka added searching by fqdn in https://github.com/akka/akka/pull/24563/files#diff-c858760d32fe74f2dcabf0ea7bc4aaecR32 , I guess we'd want to add that and use it here as well (until we move that directive to its own plugin).

Another solution for often used names like ByteString could either be an explicit configured disambiguation option ("ByteString should always mean akka.util.ByteString") or a manual exclusion list where we could put classes from "impl" packages or from "akka.proto".

[johanandren]

Sorry, I was perhaps a bit unclear, in addition to the CI-server fail, I also tried with the fqcn akka.utils.ByteString but that is also not found, and when I look at the classnames passed to the paradox-extension-tag-tingie akka.utils.ByteString is not among them for some reason.

[johanandren]

Haha, no sorry, now I misread both of your comments. Just ignore me, thanks.

[johanandren]

Something I'd like to add though, why did it stop working now all of a sudden, both of those two classes was surely on the class path before as well?

[raboof]

Hmm, that's indeed strange..

[johanandren]

Giving this one up for now, created a separate issue about upgrading Akka version and dealing with the directive.

[raboof]

We didn't see this problem before because akka-stream didn't depend on akka-protobuf before, it does since akka/akka#24230

[akka-ci]

Test FAILed.

[akka-ci]

Test FAILed.

[akka-ci]

Test PASSed.

[jrudolph]

LGTM