JDK version update

Author: markpet42

.travis.yml

@@ -4,9 +4,9 @@
 # Set up to run the Java build script per the Travis CI documentation
 language: java
 
-# Configure the build to use Oracle JDK 8
+# Configure the build to use Oracle JDK 9
 jdk:
-  - oraclejdk8
+  - oraclejdk9
 
 # Install the Ant JUnit package, which is missing from the Travis CI environment. See the Travis documentation: https://docs.travis-ci.com/user/installing-dependencies/#Adding-APT-Packages
 addons: