指定travis jdk版本

.travis.yml

@@ -1,7 +1,7 @@
 language: java
 
 jdk:
-  - oraclejdk8
+  - openjdk8
 script: "mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V  && mvn cobertura:cobertura"
 
 notifications: