如何卸载linux自带openjdk并安装sun jdk

参见：https://www.jb51.net/article/112612.htm 

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

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