卸载linux自带openjdk并安装sun jdk

参见：https://www.cnblogs.com/Dylansuns/p/6974272.html Linux安装JDK完整步骤

检查一下系统中的jdk版本

[hadoop@master ~]$ java -version
openjdk version "1.8.0_222-ea"
OpenJDK Runtime Environment (build 1.8.0_222-ea-b03)
OpenJDK 64-Bit Server VM (build 25.222-b03, mixed mode)

检测jdk安装包

[hadoop@master ~]$ rpm -qa | grep java
python-javapackages-3.4.1-11.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
tzdata-java-2019b-1.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64
java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64
[hadoop@master ~]$ 

卸载openjdk

[hadoop@master ~]$ sudo yum -y remove *openjdk*
[sudo] password for hadoop: 
Loaded plugins: langpacks, ulninfo
Resolving Dependencies
--> Running transaction check
---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.222.b03-1.el7 will be erased
--> Processing Dependency: java >= 1.5 for package: jline-1.0-8.el7.noarch
--> Processing Dependency: java-1.8.0-openjdk for package: icedtea-web-1.7.1-1.el7.x86_64
---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.222.b03-1.el7 will be erased
--> Running transaction check
---> Package icedtea-web.x86_64 0:1.7.1-1.el7 will be erased
---> Package jline.noarch 0:1.0-8.el7 will be erased
--> Processing Dependency: jline for package: rhino-1.7R5-1.el7.noarch
--> Running transaction check
---> Package rhino.noarch 0:1.7R5-1.el7 will be erased
--> Finished Dependency Resolution
ol7_UEKR5/x86_64                                                                                                                                                                   | 2.5 kB  00:00:00     
ol7_latest/x86_64                                                                                                                                                                  | 2.7 kB  00:00:00     

Dependencies Resolved

==========================================================================================================================================================================================================
 Package                                                    Arch                                  Version                                              Repository                                    Size
==========================================================================================================================================================================================================
Removing:
 java-1.8.0-openjdk                                         x86_64                                1:1.8.0.222.b03-1.el7                                @anaconda/7.7                                642 k
 java-1.8.0-openjdk-headless                                x86_64                                1:1.8.0.222.b03-1.el7                                @anaconda/7.7                                106 M
Removing for dependencies:
 icedtea-web                                                x86_64                                1.7.1-1.el7                                          @anaconda/7.7                                2.3 M
 jline                                                      noarch                                1.0-8.el7                                            @anaconda/7.7                                 72 k
 rhino                                                      noarch                                1.7R5-1.el7                                          @anaconda/7.7                                1.1 M

Transaction Summary
==========================================================================================================================================================================================================
Remove  2 Packages (+3 Dependent packages)

Installed size: 110 M
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Erasing    : icedtea-web-1.7.1-1.el7.x86_64                                                                                                                                                         1/5 
  Erasing    : rhino-1.7R5-1.el7.noarch                                                                                                                                                               2/5 
  Erasing    : jline-1.0-8.el7.noarch                                                                                                                                                                 3/5 
  Erasing    : 1:java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64                                                                                                                                        4/5 
  Erasing    : 1:java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64                                                                                                                               5/5 
  Verifying  : 1:java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64                                                                                                                               1/5 
  Verifying  : 1:java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64                                                                                                                                        2/5 
  Verifying  : icedtea-web-1.7.1-1.el7.x86_64                                                                                                                                                         3/5 
  Verifying  : rhino-1.7R5-1.el7.noarch                                                                                                                                                               4/5 
  Verifying  : jline-1.0-8.el7.noarch                                                                                                                                                                 5/5 

Removed:
  java-1.8.0-openjdk.x86_64 1:1.8.0.222.b03-1.el7                                                 java-1.8.0-openjdk-headless.x86_64 1:1.8.0.222.b03-1.el7                                                

Dependency Removed:
  icedtea-web.x86_64 0:1.7.1-1.el7                                       jline.noarch 0:1.0-8.el7                                       rhino.noarch 0:1.7R5-1.el7                                      

Complete!

上传安装介质并解压

[hadoop@master ~]$ sudo tar -xzf jdk-8u191-linux-x64.tar.gz -C /usr/lib/jvm

设置环境变量,在/etc/profile最前面加上

export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_191
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export  PATH=${JAVA_HOME}/bin:$PATH

最后生效一下source /etc/profile