[travis] Add openjdk8 and oraclejdk8
[travis] Add openjdk8 and oraclejdk8

lqc/spotbugs-maven-plugin,gleclaire/findbugs-maven-plugin,lqc/spotbugs-maven-plugin,hazendaz/findbugs-maven-plugin,hazendaz/spotbugs-maven-plugin,hazendaz/spotbugs-maven-plugin,hazendaz/findbugs-maven-plugin,lqc/spotbugs-maven-plugin,gleclaire/findbugs-maven-plugin,hazendaz/findbugs-maven-plugin,hazendaz/spotbugs-maven-plugin,gleclaire/findbugs-maven-plugin