jdk下载地址
http://www.oracle.com/technetwork/java/javase/downloads/
文件jdk-8u161-linux-x64.tar.gz
检查是否已经安装jdk
rpm -qa | grep java
删除系统预装jdk
rpm -e --nodeps `rpm -qa | grep java`
上传到linux服务器目录/opt/jdk
解压jdk压缩文件到文件夹jdk1.8.0_144
tar -zxvf jdk-8u144-linux-x64.tar.gz
配置环境变量
打开/etc/profile文件
vi /etc/profile
在文件末尾插入如下内容
export JAVA_HOME=/opt/jdk1.8.0_144
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
执行profile
source /etc/profile
检查jdk是否生效
java -version
成功
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
失败
Unrecognized option: -versin
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
可能原因jdk目录配置错误