add Java 9 test

.travis.yml

@@ -21,3 +21,25 @@ script:
   - ./sbt jcheckStyle
   - ./sbt test
   - ./sbt test -J-Dmsgpack.universal-buffer=true
+
+matrix:
+  include:
+  - dist: trusty
+    group: edge
+    sudo: required
+    jdk: oraclejdk9
+    script:
+    # https://github.com/sbt/sbt/pull/2951
+    - git clone https://github.com/retronym/java9-rt-export
+    - cd java9-rt-export/
+    - git checkout 1019a2873d057dd7214f4135e84283695728395d
+    - jdk_switcher use oraclejdk8
+    - sbt package
+    - jdk_switcher use oraclejdk9
+    - mkdir -p $HOME/.sbt/0.13/java9-rt-ext; java -jar target/java9-rt-export-*.jar $HOME/.sbt/0.13/java9-rt-ext/rt.jar
+    - jar tf $HOME/.sbt/0.13/java9-rt-ext/rt.jar | grep java/lang/Object
+    - cd ..
+    - rm sbt
+    - wget https://v-raw-githubusercontent-com.miaizhe.xyz/paulp/sbt-extras/3ba0e52f32d32c0454ec3a926caae2db0caaca12/sbt && chmod +x ./sbt
+    - ./sbt -Dscala.ext.dirs=$HOME/.sbt/0.13/java9-rt-ext test
+    - ./sbt -Dscala.ext.dirs=$HOME/.sbt/0.13/java9-rt-ext -Dmsgpack.universal-buffer=true test

project/build.properties

@@ -1,2 +1,2 @@
-sbt.version=0.13.13
+sbt.version=0.13.15
 

project/plugins.sbt

@@ -9,7 +9,7 @@ addSbtPlugin("de.johoop" % "findbugs4sbt" % "1.3.0")
 
 addSbtPlugin("de.johoop" % "jacoco4sbt" % "2.1.6")
 
-addSbtPlugin("org.xerial.sbt" % "sbt-jcheckstyle" % "0.1.2")
+addSbtPlugin("org.xerial.sbt" % "sbt-jcheckstyle" % "0.1.4")
 
 addSbtPlugin("com.typesafe.sbt" % "sbt-osgi" % "0.7.0")