use java 8

Author: fishercoder1534

.travis.yml

@@ -1,3 +1,13 @@
 language: java
 
-script: mvn package
+sudo: required
+
+jdk:
+  - oraclejdk8
+
+install: true
+
+script:
+  - sudo apt-get update && sudo apt-get install oracle-java8-installer
+  - java -version
+  - mvn package