cross JVM testing

This continues to use Oracle JDK 8 for building, but adds test jobs using oraclejdk8, oraclejdk9, and oraclejdk10.

.gitignore

@@ -8,4 +8,4 @@ src_managed
 .lib
 /template-project/project/boot
 *~
-
+/citest/freshly-baked/

.travis.yml

@@ -1,22 +1,53 @@
 dist: trusty
-addons:
-  apt:
-    packages:
-    - fakeroot
+
 language: scala
-script:
-  - sbt -Dsbt.build.version=1.0.3 ++$TRAVIS_SCALA_VERSION rpm:packageBin debian:packageBin universal:packageBin
+
+env:
+  global:
+  - SBT_VER=1.1.1
+
+matrix:
+  include:
+    ## build using JDK 8, test using JDK 8
+    - script:
+        - sbt -Dsbt.build.version=$SBT_VER universal:packageBin
+        - cd citest && ./test.sh
+
+    ## build using JDK 8, test using JDK 9
+    - script:
+        - sbt -Dsbt.build.version=$SBT_VER universal:packageBin
+        - jdk_switcher use oraclejdk9
+        - cd citest && ./test.sh
+
+    ## build using JDK 8, test using JDK 10
+    - script:
+        - sbt -Dsbt.build.version=$SBT_VER universal:packageBin
+        - citest/install-jdk10.sh
+        - cd citest && ./test.sh
+
+    - script:
+        - sbt -Dsbt.build.version=$SBT_VER rpm:packageBin debian:packageBin
+      addons:
+        apt:
+          packages:
+            - fakeroot
+            - rpm
+
 scala:
-  - 2.10.3
+  - 2.10.7
+
 jdk:
   - oraclejdk8
-notifications:
-  email:
-    - sbt-dev-bot@googlegroups.com
-before_install:
-  - cat /etc/hosts # optionally check the content *before*
-  - sudo hostname "$(hostname | cut -c1-63)"
-  - sed -e "s/^\\(127\\.0\\.0\\.1.*\\)/\\1 $(hostname | cut -c1-63)/" /etc/hosts | sudo tee /etc/hosts
-  - cat /etc/hosts # optionally check the content *after*
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq rpm
+
+# Undo _JAVA_OPTIONS environment variable
+before_script:
+  - _JAVA_OPTIONS=
+
+cache:
+  directories:
+    - $HOME/.ivy2/cache
+    - $HOME/.sbt/boot
+
+before_cache:
+  - find $HOME/.ivy2 -name "ivydata-*.properties" -delete
+  - find $HOME/.sbt  -name "*.lock"               -delete

citest/Hello.scala

@@ -0,0 +1,5 @@
+package foo
+
+object Hello extends App {
+  println("hello")
+}

citest/install-jdk10.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# copied from https://github.com/junit-team/junit5/blob/master/src/install/install-jdk-10.sh
+
+set -e
+
+JDK_FEATURE=10
+TMP=$(curl -L jdk.java.net/${JDK_FEATURE})              # extract most recent "JDK_BUILD" number from web page source...
+TMP="${TMP#*Most recent build: jdk-${JDK_FEATURE}+}" # remove everything before the number
+TMP="${TMP%%<*}"                                        # remove everything after the number
+JDK_BUILD="$(echo -e "${TMP}" | tr -d '[:space:]')"     # remove all whitespace
+JDK_ARCHIVE=jdk-${JDK_FEATURE}+${JDK_BUILD}_linux-x64_bin.tar.gz
+
+cd ~
+wget http://download.java.net/java/jdk${JDK_FEATURE}/archive/${JDK_BUILD}/BCL/${JDK_ARCHIVE}
+tar -xzf ${JDK_ARCHIVE}
+export JAVA_HOME=~/jdk-${JDK_FEATURE}
+export PATH=${JAVA_HOME}/bin:$PATH
+cd -
+java --version

citest/project/build.properties

@@ -1 +1 @@
-sbt.version=1.0.4
+sbt.version=1.1.1

citest/test.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+## https://github.com/travis-ci/travis-ci/issues/8408
+export _JAVA_OPTIONS=
+
+## begin Java switching
+## swtich to JDK 10 if we've downloaded it
+if [ -d ~/jdk-10 ]
+then
+  JAVA_HOME=~/jdk-10
+fi
+## include JAVA_HOME into path
+PATH=${JAVA_HOME}/bin:$PATH
+java -version
+## end of Java switching
+
+mkdir freshly-baked
+unzip -qo ../target/universal/sbt.zip -d ./freshly-baked
+
+SBT_OPTS=-Dfile.encoding=UTF-8
+
+./freshly-baked/sbt/bin/sbt about run

project/build.properties

@@ -1,2 +1 @@
 sbt.version=0.13.16
-