tests no longer compile/run on Java 6

[SethTisue]

#166 adds references to java.util.Base64 to jvm/src/test, but that's Java 8 API, doesn't exist on Java 6 or 7

which also raises a meta-issue: why didn't Travis-CI catch it?

caught by the Scala community build, at e.g. https://scala-ci.typesafe.com/view/scala-2.11.x/job/scala-2.11.x-integrate-community-build/822/

[SethTisue]

(I've heard that Java 9 adds a --release option you can use to catch things like this without having to build or run on the old JDK)

[ashawley]

Bleh, well that's good dbuild caught it. Looks like Travis failed to switch to openjdk6, but silently kept going:

$ jdk_switcher use openjdk6
Switching to OpenJDK6 (java-1.6.0-openjdk-amd64), JAVA_HOME will be set to /usr/lib/jvm/java-6-openjdk-amd64
update-java-alternatives: directory does not exist: /usr/lib/jvm/java-1.6.0-openjdk-amd64

Looks like this is a new issue when the Ubuntu build infrastructure was upgraded from precise to trusty.

[ashawley]

Ripping out the Base64 code revealed another issue, which is that org.apache.commons.commons-lang3 is Java 7 as well. Might be able to use an earlier version.

[ashawley]

And now a third issue which is that Scala.js test suite fails in Java 6. We updated the scalajs plugin from 0.6.16 to 0.6.20 in 25c7dc3, and that seems to be the breaking change.

Might this be fixed in the next release of Scala.js in scala-js/scala-js#3128

> xmlJS/test
[info] Fast optimizing scala-xml/js/target/scala-2.11/scala-xml-test-fastopt.js
java.lang.NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
	at org.scalajs.testcommon.RPCCore.close(RPCCore.scala:155)
	at org.scalajs.testadapter.ComJSEnvRPC.close(ComJSEnvRPC.scala:59)
	at org.scalajs.testadapter.ScalaJSRunner$$anonfun$waitAndClose$1$1.apply(ScalaJSRunner.scala:69)
	at org.scalajs.testadapter.ScalaJSRunner$$anonfun$waitAndClose$1$1.apply(ScalaJSRunner.scala:69)
	at scala.util.Success$$anonfun$map$1.apply(Try.scala:206)
	at scala.util.Try$.apply(Try.scala:161)
	at scala.util.Success.map(Try.scala:206)
	at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
	at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)

[ashawley]

I've fixed the meta-issue with Travis and the three issues with Java 6. This should have fixed community-build for Scala 2.11

[SethTisue]

let's see: https://scala-ci.typesafe.com/view/scala-2.11.x/job/scala-2.11.x-integrate-community-build/824/consoleFull (404 til Jenkins gets out of bed and does 100 pushups while repeating his personal daily affirmations under his breath)

[SethTisue]

[info] >>> The dbuild result is------------: SUCCESS (project rebuilt ok)