Shulou(Shulou.com)06/02 Report--

Step 1: Check the openJDK that comes with Linux and uninstall: 1. Check out the openJDK that comes with Linux: [root@localhost ~]# java -versionjava version "1.7.0_131"OpenJDK Runtime Environment (rhel-2.6.9.0.el6_8-x86_64 u131-b00)OpenJDK 64-Bit Server VM (build 24.131-b00, mixed mode)2. Check the rpm package for the installed openJDK: [root@localhost ~]# rpm -qa| grep javajava-1.7.0-openjdk-1.7.0.131-2.6.9.0.el6_8.x86_64tzdata-java-2016j-1.el6.noarchjava-1.6.0-openjdk-1.6.0.41-1.13.13.1.el6_8.x86_643. Uninstall the openJDK that comes with it: [root@localhost ~]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.131-2.6.9.0.el6_8.x86_64[root@localhost ~]# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.41-1.13.13.1.el6_8.x86_64[root@localhost ~]# rpm -e --nodeps tzdata-java-2016j-1.el6.noarch

Then look under/usr/lib/jvm, which is now empty and has been uninstalled clean.

Step 2: Install JDK 4 from Oracle. Upload Oracle jdk installation package jdk-8u191-linux-x64.tar.gz using ftp and extract it to the specified directory:

[root@ localhost ~]# tar xvf jdk-8u191-linux-x64.tar.gz -C /usr/local/

5. Create soft connection: [root@localhost ~]# cd /usr/local/[root@ localhost local]# ln -s jdk1.8.0_191 java6. Configure environment variables:

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

Add the following at the end of the document:

export JAVA_HOME=/usr/local/javaexport CLASSPATH=.:$ JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar export PATH=$JAVA_HOME/bin:$PATH

Save exit to make configuration effective:

[root@ bogon jdk1.8.0_191]# source /etc/profile

7. Verify installation succeeded [root@localhost local]# java -versionjava version "1.8.0_191"Java(TM) SE Runtime Environment (build 1.8.0_191-b12)Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

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