有没有办法更新所有Java相关的替代品？

有没有办法使用update-alternatives快速切换所有与Java相关的替代方案？

例如,如果要将Java切换到7,我运行sudo update-alternatives –config java并选择Java 7 OpenJdk.但是如果我运行update-alternatives –get-selections | grep java我得到以下内容,

appletviewer                   auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/appletviewer
extcheck                       auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/extcheck
idlj                           auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/idlj
itweb-settings                 auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/itweb-settings
jar                            auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jar
jarsigner                      auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jarsigner
java                           manual   /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
javac                          auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/javac
javadoc                        auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/javadoc
javah                          auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/javah
javap                          auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/javap
javaws                         auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/javaws
jconsole                       auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jconsole
jdb                            auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jdb
jexec                          auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/lib/jexec
jhat                           auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jhat
jinfo                          auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jinfo
jmap                           auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jmap
jps                            auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jps
jrunscript                     auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jrunscript
jsadebugd                      auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jsadebugd
jstack                         auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jstack
jstat                          auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jstat
jstatd                         auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/jstatd
keytool                        auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/keytool
native2ascii                   auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/native2ascii
orbd                           auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/orbd
pack200                        auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/pack200
policytool                     auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/policytool
rmic                           auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/rmic
rmid                           auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/rmid
rmiregistry                    auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/rmiregistry
schemagen                      auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/schemagen
serialver                      auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/serialver
servertool                     auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/servertool
tnameserv                      auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/tnameserv
unpack200                      auto     /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/unpack200
wsgen                          auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/wsgen
wsimport                       auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/wsimport
xjc                            auto     /usr/lib/jvm/java-6-openjdk-amd64/bin/xjc

正如您所看到的,我的Java替代方案已切换到7,但基于OpenJDK 6的其他替代方案未切换.当然我可以手动切换每个人或写一个脚本来做到这一点,但我认为有一个更好的方法来实现这一目标.

解决方法:

诀窍是使用update-java-alternatives(来自java-common包).

因此,为了获得OpenJDK 6到7,我使用update-java-alternatives -l来获取Java替代品的列表,然后使用sudo update-java-alternatives -s java-1.7.0-openjdk-amd64到JDK.

注意：上面的命令引发了以下错误,

update-alternatives: error: no alternatives for mozilla-javaplugin.so.
update-java-alternatives: plugin alternative does not exist: /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so

这是因为默认情况下未安装openjdk插件.修复运行

sudo apt-get install icedtea-7-plugin

并重新运行update-java-alternatives.

标签：java,alternative
来源： https://codeday.me/bug/20190807/1609090.html