ubuntu下jdk安装


1. 下载

官网下载对应版本.tar.gz文件即可;

2. 安装

2.1 卸载openjdk(如果有的话):

$: rpm -qa|grep java  # 查询openjdk相关文件
$: rpm -e --nodeps xxx  # 将查询到的全部卸载

2.2 解压:

$: tar -zxvf jdk-8u212-linux-x64.tar.gz -C /opt/apps

2.3 配置环境变量/etc/profile

export JAVA_HOME=/opt/apps/jdk1.8.0_211
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

2.4 刷新配置:

$: source /etc/profile

2.5 验证:

$: java -version

补充:在hadoop源码的building.txt中,关于oracle jdk(和maven)的安装:

...
Installing required packages for clean install of Ubuntu 14.04 LTS Desktop:

* Oracle JDK 1.8 (preferred)
  $ sudo apt-get purge openjdk*
  $ sudo apt-get install software-properties-common
  $ sudo add-apt-repository ppa:webupd8team/java
  $ sudo apt-get update
  $ sudo apt-get install oracle-java8-installer
* Maven
  $ sudo apt-get -y install maven
...