Kali安装JDK8和JDK17切换

在进行漏洞复现的时候，发现kali中JDK为17，所以一些POC用不了，需要JDK低版本

• 安装JDK1.8[下载地址]

mkdir -p /usr/local/java
cp jdk-8u251-linux-x64.tar.gz  /usr/local/java
tar -zxvf jdk-8u251-linux-x64.tar.gz

• 配置环境变量

vim /etc/profile

# 进入环境变量
JAVA_HOME=/usr/local/java/jdk1.8.0_251 
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH

# 通知Java目录
update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_251/bin/java" 1
update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_251/bin/javac" 1
update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_251/bin/javaws" 1
update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_251/bin/javaws" 1

• 切换Java版本

update-alternatives --config java