Install JDK8 in rpm mode on CentOS7

After CentOS 7 is successfully installed, OpenJDK's JRE may have been installed by default, but a complete JDK is required for normal JAVA development. So in order to avoid unnecessary trouble in the future, OpenJDK's JRE is uninstalled here and Oracle's JDK8 is reinstalled

1. Installation Instructions

System environment: CentOS 7

Installation method: rpm

Installation package: jdk-8u131-linux-x64.rpm

2. Check the original installation version of the system

[hadoop@centos7-1 ~]$ java -version
OpenJDK Version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b12)
OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode)

[hadoop@centos7-1 ~]$ rpm -qa|grep java
libvirt-java-devel-0.4.9-4.el7.noarch
tzdata-java-2017b-1.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64
libvirt-java-0.4.9-4.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64
java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64
python-javapackages-3.4.1-11.el7.noarch
[hadoop@centos7-1 ~]$

3. Uninstall the openjdk installed on the system

libvirt-java-devel-0.4.9-4.el7.noarch
libvirt-java-0.4.9-4.el7.noarch
tzdata-java-2017b-1.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64
java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64
java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64

Run the following command as root:

[root@centos7-1 hadoop]# rpm -e --nodeps libvirt-java-devel-0.4.9-4.el7.noarch
[root@centos7-1 hadoop]# rpm -e --nodeps libvirt-java-0.4.9-4.el7.noarch
[root@centos7-1 hadoop]# rpm -e --nodeps tzdata-java-2017b-1.el7.noarch
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.1.el7_3.x86_64
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
[root@centos7-1 hadoop]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64

4. Install JDK

[root@centos7-1 local]# ll /usr/local/jdk-8u131-linux-x64.rpm 
 -rw-r--r--. 1 root root 169983496 6月12 23:17 /usr/local/jdk-8u131-linux-x64.rpm
[root@centos7-1 local]# rpm -ivh jdk-8u131-linux-x64.rpm 
 Preparing... ################################# [100%]
 Updating / installing...
  1:jdk1.8.0_131-2000:1.8.0_131-fcs ################################### [100%]
 Unpacking JAR files...
  tools.jar...
  plugin.jar...
  javaws.jar...
  deploy.jar...
  rt.jar...
  jsse.jar...
  charsets.jar...
  localedata.jar...
[root@centos7-1 local]#

jdk is installed by default in /usr/java/

[root@centos7-1 local]# ll /usr/java/
total 0
lrwxrwxrwx. 1 root root 16 6月12 23:18 default -> /usr/java/latest
drwxr-xr-x. 9 root root 268 June 12 23:18 jdk1.8.0_131
lrwxrwxrwx. 1 root root 22 6月12 23:18 latest -> /usr/java/jdk1.8.0_131
[root@centos7-1 local]#

5. Verify the installation

[root@centos7-1 local]# ll /usr/bin/java
lrwxrwxrwx. 1 root root 22 6月12 23:18 /usr/bin/java -> /etc/alternatives/java
[root@centos7-1 local]# ll /etc/alternatives/java
lrwxrwxrwx. 1 root root 35 6月12 23:18 /etc/alternatives/java -> /usr/java/jdk1.8.0_131/jre/bin/java
[root@centos7-1 local]# java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
[root@centos7-1 local]#

6. Configure environment variables

[hadoop@centos7-1 ~]$ whoami
hadoop
[hadoop@centos7-1 ~]$ vi ~/.bashrc

Set JAVA_HOME and add it to PATH

JAVA_HOME=/usr/java/default
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME PATH

Run the source command to make the changes take effect. Output JAVA_HOME and PATH to confirm whether the changes are effective.

[hadoop@centos7-1 ~]$ source ~/.bashrc
[hadoop@centos7-1 ~]$ echo $JAVA_HOME
/usr/java/default
[hadoop@centos7-1 ~]$ echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/hadoop/.local/bin:/home/hadoop/bin:/usr/java/default/bin

At this point, the installation of JDK8 on CentOS 7 has been successfully completed. For more articles about installing JDK under Linux, please see the following related links

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