OpenJDK Runtime Environment (IcedTea6 1.13.10) (rhel-1.13.10.0.el6_7-x86_64) OpenJDK 64-Bit Server V

[hadoop@djtNode5 ~]$ java -version
java version "1.6.0_38"
OpenJDK Runtime Environment (IcedTea6 1.13.10) (rhel-1.13.10.0.el6_7-x86_64)
OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)

关于rpm安装或系统自带jdk删除方法：使用rpm -qa | grep jdk命令，列出存在的jdk

[hadoop@djtNode5 ~]$ rpm -qa | grep jdk
java-1.6.0-openjdk-devel-1.6.0.38-1.13.10.0.el6_7.x86_64
java-1.6.0-openjdk-1.6.0.38-1.13.10.0.el6_7.x86_64

然后在root用户下rpm -e --nodeps删除：

[root@djtNode3 ~]# rpm -e --nodeps java-1.6.0-openjdk-devel-1.6.0.38-1.13.10.0.el6_7.x86_64
[root@djtNode3 ~]# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.38-1.13.10.0.el6_7.x86_64
[root@djtNode3 ~]# rpm -qa | grep jdk
<pre name="code" class="java">[root@djtNode3 ~]#

最后安装自己需要的jdk即可。