Article From:

LinuxInstall JDK complete steps

Original link:

1、Check the version of the JDK in the system

[root@localhost software]# java -version


openjdk version "1.8.0_102"
OpenJDK Runtime Environment (build 1.8.0_102-b14)
OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)

2、Detection of JDK installation package

[root@localhost software]# rpm -qa | grep java


Copy code
Copy code

3、Uninstall openjdk

[root@localhost software]# rpm -e --nodeps tzdata-java-2016g-2.el7.noarch
[root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-
[root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-headless-
[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-
[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-headless-

Or use

[root@localhost jvm]# yum remove *openjdk*

Then input rpm -qa grep Java again to view the uninstall:

[root@localhost software]# rpm -qa | grep java

4、Install a new JDK

First, download the version of the JDK you want on the JDK website. After the download is completed, the JDK installation package will be installed under the Linux system specified folder, and the command is entered under the folder.

Copy code
[root@localhost software]# ll
total 252664
-rw-r--r--. 1 root root  11830603 Jun  9 06:43 alibaba-rocketmq-3.2.6.tar.gz
-rw-r--r--. 1 root root  43399561 Jun  9 06:42 apache-activemq-5.11.1-bin.tar.gz
-rwxrw-rw-. 1 root root 185540433 Apr 21 09:06 jdk-8u131-linux-x64.tar.gz
-rw-r--r--. 1 root root   1547695 Jun  9 06:44 redis-3.2.9.tar.gz
-rw-r--r--. 1 root root  16402010 Jun  9 06:40 zookeeper-3.4.5.tar.gz
Copy code

Unzip the jdk-8u131-linux-x64.tar.gz installation package

[root@localhost software]# mkdir -p /usr/lib/jvm
[root@localhost software]# tar -zxvf jdk-8u131-linux-x64.tar.gz -C /usr/lib/jvm

5、Setting the environment variable

[root@localhost software]# vim /etc/profile

Add to the front:

export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_131  
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export  PATH=${JAVA_HOME}/bin:$PATH

6、Execute the profile file

[root@localhost software]# source /etc/profile

This allows the configuration to take effect without restarting.

7、Check the newly installed JDK

[root@localhost software]# 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)

So far, the entire installation process ends.

Leave a Reply

Your email address will not be published. Required fields are marked *