Detailed explanation of the steps to install JDK on Linux

1. Check the jdk version in the system

[root@localhost software]# java -version

Display:

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. Check the jdk installation package

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

Display:

java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
python-javapackages-3.4.1-11.el7.noarch
tzdata-java-2016g-2.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64

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-1.7.0.111-2.6.7.8.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64

and then enter rpm -qa | grep java again Check the uninstallation status:

[root@localhost software]# rpm -qa | grep javapython-javapackages-3.4.1-11.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch

4. Install a new jdk

First go to the jdk official website to download the jdk version you want. After the download is complete, you will need to install the jdk Place the installation package in the folder specified by the Linux system, and enter the command to enter the folder:

[root@localhost software]# lltotal 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

Extract 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. Set environment variables

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

Add at 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 profile File

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

This allows the configuration to take effect immediately without restarting.

7. Check the newly installed jdk

[root@localhost software]# java -version

Display:

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)

That’s it, the entire installation process is over.

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