Configure java enviroment in linux

最新推荐文章于 2024-07-05 17:09:59 发布

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最新推荐文章于 2024-07-05 17:09:59 发布

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本文详细介绍如何在Ubuntu系统上安装并配置JDK 8环境变量，并解决版本冲突问题，确保正确版本的Java运行。

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►►download the JDK8 and decompress the compression package

tar zxvf jdk-8u171-linux-x64.tar.gz

►►configure the java enviroment

> first open the /etc/enviroment ,add content into the file as blow:

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:$JAVA_HOME/bin"
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export JAVA_HOME=~/java/jdk1.8

> open the /etc/profile , also add content into the file as blow:

export JAVA_HOME=~/java/jdk1.8.0_56
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

> checking

java -version

PS:After that I found out the java version always is 1.5 not 1.8,so I look for the reason,i found the java src default is usr/java in ubuntu,so must modify the default src, you can input these instructions in command

sudo update-alternatives --install /usr/bin/java java yourjdk/bin/java 300

sudo update-alternatives --install /usr/bin/javac javac /yourjdk/bin/javac 300

sudo update-alternatives --install /usr/bin/jar jar yourjdk/bin/jar 300

sudo update-alternatives --install /usr/bin/javah javah yourjdk/bin/javah 300

sudo update-alternatives --install /usr/bin/javap javap yourjdk/bin/javap 300

finnaly you can input :