[root@arm-huangtianhua spark]# which java
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.aarch64/bin/java
You have new mail in /var/spool/mail/root

[root@arm-huangtianhua spark]# java -version
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (build 1.8.0_212-b04)
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

[root@arm-huangtianhua spark]# which mvn
/usr/local/src/apache-maven-3.6.1/bin/mvn

[root@arm-huangtianhua spark]# uname -a
Linux arm-huangtianhua 4.14.0-49.el7a.aarch64 #1 SMP Tue Apr 10 17:22:26
UTC 2018 aarch64 aarch64 aarch64 GNU/Linux