hadoop启动后用jps查看，出现如下情况，请大神指教

ubuntu@master:~$ jps
The program 'jps' can be found in the following packages:

• openjdk-7-jdk
• openjdk-6-jdk Try: sudo apt-get install

ubuntu@master:~$ java -version
java version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.5) (7u79-2.5.5-0ubuntu0.14.04.2)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)

OpenJDK1.7没有jps工具，需要安装sun JDK