Use travis default jdk
Use travis default jdk

samsara/samsara,ChallenHB/samsara,ChallenHB/samsara,ChallenHB/samsara,samsara/samsara,samsara/samsara,samsara/samsara,samsara/samsara,samsara/samsara,ChallenHB/samsara,ChallenHB/samsara