Import travis caching config and JDK install from scala-dev

.travis.yml

@@ -1,3 +1,7 @@
+version: ~> 1.0 # needed for imports
+
+import: scala/scala-dev:travis/default.yml
+
 language: scala
 
 scala:
@@ -15,17 +19,7 @@ env:
     - ADOPTOPENJDK=8
     - ADOPTOPENJDK=11
 
-before_install:
-  # adding $HOME/.sdkman to cache would create an empty directory, which interferes with the initial installation
-  - "[[ -d $HOME/.sdkman/bin ]] || rm -rf $HOME/.sdkman/"
-  - curl -sL https://get.sdkman.io | bash
-  - echo sdkman_auto_answer=true > $HOME/.sdkman/etc/config
-  - source "$HOME/.sdkman/bin/sdkman-init.sh"
-
 install:
-  - sdk install java $(sdk list java | grep -o "$ADOPTOPENJDK\.[0-9\.]*hs-adpt" | head -1)
-  - unset JAVA_HOME
-  - java -Xmx32m -version
   - git fetch --tags # get all tags for sbt-dynver
 
 script: ./build.sh
@@ -34,14 +28,3 @@ notifications:
   email:
     - [email protected]
     - [email protected]
-
-before_cache:
-  - rm -f $HOME/.ivy2/.sbt.ivy.lock
-  - find $HOME/.ivy2/cache     -name "ivydata-*.properties" | xargs rm
-  - find $HOME/.sbt            -name "*.lock"               | xargs rm
-cache:
-  directories:
-    - $HOME/.ivy2/cache
-    - $HOME/.sbt
-    - $HOME/.cache/coursier
-    - $HOME/.sdkman