Linux installation JDK complete steps

1, check the JDK version of the system

[[email protected] software]# java -version

Show:

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、检测jdk安装包

[Email protected] software]# Rpm-qa | grep Java ' '
Show:

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java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64python-javapackages-3.4.1-11.el7.noarchtzdata-java-2016g-2.el7.noarchjavapackages-tools-3.4.1-11.el7.noarchjava-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64

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3, uninstall OPENJDK

[[email protected] software]# rpm -e --nodeps tzdata-java-2016g-2.el7.noarch[[email protected] software]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64[[email protected] software]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64[[email protected] software]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64[[email protected] software]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64

or use

[[email protected] jvm]# yum remove *openjdk*

Then enter RPM-QA again | grep java to view the uninstall situation:

[[email protected] software]# rpm -qa | grep javapython-javapackages-3.4.1-11.el7.noarchjavapackages-tools-3.4.1-11.el7.noarch

4. Install a new JDK

First download the JDK version you want on the JDK website, and after the download is complete, place the JDK installation package that you need to install into the folder specified by the Linux system, and the command goes to that folder:

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[[email protected] 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

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Unzip the JDK-8U131-LINUX-X64.TAR.GZ installation package

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

5. Setting Environment variables

[[email protected] software]# vim /etc/profile

At the top of the add:

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

[[email protected] software]# source /etc/profile

This allows the configuration to take effect immediately without rebooting.

7. Check for newly installed JDK

[[email protected] software]# java -version

Show:

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)

This concludes the entire installation process.

Linux installation JDK complete steps