specs2, sbt 0.12 and scala 2.9.1

[Robin Green]

I can't run my specs2 tests on scala 2.9.1, with or without fork := true, from sbt 0.12.0, because I keep getting IncompatibleClassChangeError. Unfortunately the IncompatibleClassChangeError doesn't specify which class it's talking about, and many people have reported this error in connection with sbt in the past. I suspect that in my case this is related to the following classpath entry:

/home/robin/.sbt/boot/scala-2.9.2/org.scala-sbt/sbt/0.12.0/test-agent-0.12.0.jar

which presumably is compiled against Scala 2.10?

The reason I tried to switch to sbt 0.12.0 was to use (a derivative of) sbt-native-packager, which is no longer available for sbt 0.11.3.

[Robin Green]

Ah, no, should have looked more closely - it looks like it's compiled against 2.9.2, and anyway test-interface is probably the more likely culprit. What's particularly galling about this is:

(a) the "bad"-looking test interface jar is not on the test:full-classpath - so full-classpath is a misnomer
(b) another version of it, presumably the correct version which specs2 already depends on anyway, IS on the full-classpath!

So it looks like I just need to figure out how to rip out the offending duplicate jar for test-interface.

[Robin Green]

(oops, posted with wrong email address just now)

No, it can't be the duplicate test-interface jar - it is byte-for-byte identical to the other jar. Must be something else.

[Robin Green]

Sorry for the noise - it appears to be due to other dependencies not being updated for an incompatible specs2 change between snapshots, and entirely unrelated to my move to sbt 0.12.0.