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Mr. Wrong
Asked: 2018-09-29 06:11:44 +0800 CST

无法使用 update-alternatives --install 安装 jdk11

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为了试用 jdk11 的新功能，我将它安装到 /opt/ 并希望使用 update-alternatives 来使用它，如下所示：

sudo update-alternatives --install /etc/alternatives/java OpenJDK-11 /opt/jdk-11/bin/java 1102

返回：

update-alternatives: using /opt/jdk-11/bin/javac to provide /etc/alternatives/java (OpenJDK-11) in auto mode

但是，当我这样做时

$ sudo update-alternatives --config java

我没有看到我刚刚安装的jdk。相反，我收到警告和已经存在的选择：

update-alternatives: warning: /etc/alternatives/java has been changed (manually or by a script); switching to manual updates only
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1101      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1101      manual mode
  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

警告是什么意思，为什么它实际上同时显示自动和手动模式条目？为什么我的jdk11不在里面？

openjdk update-alternatives

1 个回答

  1. Best Answer

    我认为您的第一个命令是错误的；它应该是：

    sudo update-alternatives /usr/bin/java java /opt/jdk-11/bin/java 1102

    对于 jdk 的所有其他可执行文件也是如此。

    怎么做

    安装 jdk-11

    首先将 jdk-11 安装在/usr/lib/jvm. 我们将openjdk-11+28-amd64在这里使用

    创建一个 shell 脚本来自动更新替代方案

    我称之为jdk-11.sh

    #!/bin/bash
if [[ $# -eq 0 ]] ;then
    echo "Usage: jdk-11.sh [-i|-r]"
    echo "  -i install alternatives for jdk-11"
    echo "  -r remove alternatives for jdk-11"
    exit -1
fi

install_dir="openjdk-11+28-amd64"

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

if [[ "$1" == "-i" ]] ;then
    for c in ${cmd[@]}; do
        update-alternatives --install /usr/bin/$c $c /usr/lib/jvm/$install_dir/bin/$c 1102
    done
fi

if [[ "$1" == "-r" ]] ;then
    for c in ${cmd[@]}; do
        update-alternatives --remove $c /usr/lib/jvm/$install_dir/bin/$c
        update-alternatives --auto $c
    done
fi

    然后使jdk-11.sh可执行文件，并运行

    sudo ./jdk-11.sh -i

    为新的 jdk-11 添加替代品

    切换到这个 jdk-11

    然后在update-java-alternatives

    我们需要一个.openjdk-11+28.jinfo在里面调用的帮助文件/usr/lib/jvm

    name=openjdk-11+28-amd64
alias=openjdk-11+28-amd64
priority=1102
section=main

hl rmid /usr/lib/jvm/openjdk-11+28-amd64/bin/rmid
hl java /usr/lib/jvm/openjdk-11+28-amd64/bin/java
hl keytool /usr/lib/jvm/openjdk-11+28-amd64/bin/keytool
hl jjs /usr/lib/jvm/openjdk-11+28-amd64/bin/jjs
hl pack200 /usr/lib/jvm/openjdk-11+28-amd64/bin/pack200
hl rmiregistry /usr/lib/jvm/openjdk-11+28-amd64/bin/rmiregistry
hl unpack200 /usr/lib/jvm/openjdk-11+28-amd64/bin/unpack200
hl jexec /usr/lib/jvm/openjdk-11+28-amd64/lib/jexec
jdkhl jlink /usr/lib/jvm/openjdk-11+28-amd64/bin/jlink
jdkhl jdeps /usr/lib/jvm/openjdk-11+28-amd64/bin/jdeps
jdkhl rmic /usr/lib/jvm/openjdk-11+28-amd64/bin/rmic
jdkhl jinfo /usr/lib/jvm/openjdk-11+28-amd64/bin/jinfo
jdkhl jstat /usr/lib/jvm/openjdk-11+28-amd64/bin/jstat
jdkhl javac /usr/lib/jvm/openjdk-11+28-amd64/bin/javac
jdkhl jhsdb /usr/lib/jvm/openjdk-11+28-amd64/bin/jhsdb
jdkhl jps /usr/lib/jvm/openjdk-11+28-amd64/bin/jps
jdkhl jstack /usr/lib/jvm/openjdk-11+28-amd64/bin/jstack
jdkhl jrunscript /usr/lib/jvm/openjdk-11+28-amd64/bin/jrunscript
jdkhl javadoc /usr/lib/jvm/openjdk-11+28-amd64/bin/javadoc
jdkhl jmod /usr/lib/jvm/openjdk-11+28-amd64/bin/jmod
jdkhl javap /usr/lib/jvm/openjdk-11+28-amd64/bin/javap
jdkhl jar /usr/lib/jvm/openjdk-11+28-amd64/bin/jar
jdkhl jaotc /usr/lib/jvm/openjdk-11+28-amd64/bin/jaotc
jdkhl jshell /usr/lib/jvm/openjdk-11+28-amd64/bin/jshell
jdkhl jmap /usr/lib/jvm/openjdk-11+28-amd64/bin/jmap
jdkhl jdeprscan /usr/lib/jvm/openjdk-11+28-amd64/bin/jdeprscan
jdkhl jimage /usr/lib/jvm/openjdk-11+28-amd64/bin/jimage
jdkhl jstatd /usr/lib/jvm/openjdk-11+28-amd64/bin/jstatd
jdkhl jdb /usr/lib/jvm/openjdk-11+28-amd64/bin/jdb
jdkhl serialver /usr/lib/jvm/openjdk-11+28-amd64/bin/serialver
jdkhl jcmd /usr/lib/jvm/openjdk-11+28-amd64/bin/jcmd
jdkhl jarsigner /usr/lib/jvm/openjdk-11+28-amd64/bin/jarsigner
jdk jconsole /usr/lib/jvm/openjdk-11+28-amd64/bin/jconsole

    然后运行

    sudo update-java-alternatives -s openjdk-11+28-amd64

    回滚到 ubuntu 包

    sudo update-java-alternatives -s java-1.11.0-openjdk-amd64
sudo ./jdk-11.sh -r # optionnal
sudo rm -rf /usr/lib/jvm/openjdk-11+28-amd64 # optionnal
    • 9

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