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如何使用 update-alternatives 正确安装 Temurin JDK

tag-icon • tag-icon java update-alternatives
如何使用 update-alternatives 正确安装 Temurin JDK

我想安装 Temurin JDK 8 和 11，我按照以下步骤安装它们

wget https://github.com/adoptium/temurin8-binaries/releases/download/jdk8u312-b07/OpenJDK8U-jdk_x64_linux_hotspot_8u312b07.tar.gz
tar xzf OpenJDK8U-jdk_x64_linux_hotspot_8u312b07.tar.gz

sudo mv jdk8u312-b07/  /usr/lib/jvm/temurinjdk-8-hotspot-amd64

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/temurinjdk-8-hotspot-amd64/bin/java" 1081
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/temurinjdk-8-hotspot-amd64/bin/javac" 1081

但我不确定这是否 100% 正确，以及如何生成 .jinfo 文件，这是否必要？

答案1

您可以使用Adoptium Debian / Ubuntu 存储库

  1. 添加 Eclipse Adoptium GPG 密钥

    wget -O - https://packages.adoptium.net/artifactory/api/gpg/key/public | sudo apt-key add -

  2. 添加 Eclipse Adoptium apt 存储库

    echo "deb https://packages.adoptium.net/artifactory/deb $(awk -F= '/^VERSION_CODENAME/{print$2}' /etc/os-release) main" | sudo tee /etc/apt/sources.list.d/adoptium.list

  3. 安装您需要的 Temurin 版本

    sudo apt update # update if you haven't already
sudo apt install temurin-8-jdk
sudo apt install temurin-17-jdk

  4. 配置默认版本

    sudo update-alternatives --config java

答案2

我从原始 AdoptOpenJDK deb 包中提取了脚本，并修改了版本以供使用：

wget https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.1%2B12/OpenJDK17U-jdk_x64_linux_hotspot_17.0.1_12.tar.gz

mkdir -p /usr/lib/jvm

sudo tar -xvvf OpenJDK17U-jdk_x64_linux_hotspot_17.0.1_12.tar.gz -C /usr/lib/jvm/

sudo ./java-alternative install /usr/lib/jvm/jdk-17.0.1+12
sudo ./java-alternative set /usr/lib/jvm/jdk-17.0.1+12
…
sudo ./java-alternative remove /usr/lib/jvm/jdk-17.0.1+12

脚本源代码：

#!/bin/sh

set -eu

priority=2222
#jdk_base_dir=/usr/lib/jvm/adoptopenjdk-11-hotspot-amd64
#jdk_base_dir=/usr/lib/jvm/jdk-17.0.1+12
jdk_base_dir="$2"

if [ ! -d "$jdk_base_dir" ]
then
    echo "Invalid java directory. Choose one of: ";
    ls -1d /usr/lib/jvm/*
    exit
fi

tools="jaotc jar jarsigner java javac javadoc javap jcmd jconsole jdb jdeprscan jdeps jfr jhsdb jimage jinfo jjs jlink jmap jmod jps jrunscript jshell jstack jstat jstatd keytool pack200 rmic rmid rmiregistry serialver unpack200 jexec jspawnhelper"

case "$1" in
install)
    for tool in $tools ; do
        for tool_path in "$jdk_base_dir/bin/$tool" "$jdk_base_dir/lib/$tool" ; do
            if [ ! -e "$tool_path" ]; then
                continue
            fi

            slave=""
            tool_man_path="$jdk_base_dir/man/man1/$tool.1"
            if [ -e "$tool_man_path" ]; then
                slave="--slave /usr/share/man/man1/$tool.1 $tool.1 $tool_man_path"
            fi

            update-alternatives \
                --install \
                "/usr/bin/$tool" \
                "$tool" \
                "$tool_path" \
                "$priority" \
                $slave
        done
    done
;;
remove)
    for tool in $tools ; do
        for tool_path in "$jdk_base_dir/bin/$tool" "$jdk_base_dir/lib/$tool" ; do
            if [ ! -e "$tool_path" ]; then
                continue
            fi

            update-alternatives \
                --remove \
                "$tool" \
                "$tool_path"
        done
    done
;;
set)
    for tool in $tools ; do
        for tool_path in "$jdk_base_dir/bin/$tool" "$jdk_base_dir/lib/$tool" ; do
            if [ ! -e "$tool_path" ]; then
                continue
            fi

            update-alternatives \
                --set \
                "$tool" \
                "$tool_path"
        done
    done
;;
esac

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