Ubuntu 24.04 update-alternatives複数バージョンを切り替える

2024年8月10日

環境
Ubuntu 24.04

1.公式リポジトリから複数バージョンをインストールしている場合は
[update-alternatives] で切り替えます

# update-alternatives --config java

There are 4 choices for the alternative java (providing /usr/bin/java).

Selection Path Priority Status

------------------------------------------------------------

0 /usr/lib/jvm/java-21-openjdk-amd64/bin/java 2111 auto mode

1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode

* 2 /usr/lib/jvm/java-17-openjdk-amd64/bin/java 1711 manual mode

3 /usr/lib/jvm/java-21-openjdk-amd64/bin/java 2111 manual mode

4 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode

Press <enter> to keep the current choice[*], or type selection number: 3

update-alternatives: using /usr/lib/jvm/java-21-openjdk-amd64/bin/java to provide /usr/bin/java (java) in manual mode

# update-alternatives --config java There are 4 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/lib/jvm/java-21-openjdk-amd64/bin/java 2111 auto mode 1 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 manual mode * 2 /usr/lib/jvm/java-17-openjdk-amd64/bin/java 1711 manual mode 3 /usr/lib/jvm/java-21-openjdk-amd64/bin/java 2111 manual mode 4 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode Press <enter> to keep the current choice[*], or type selection number: 3 update-alternatives: using /usr/lib/jvm/java-21-openjdk-amd64/bin/java to provide /usr/bin/java (java) in manual mode

# update-alternatives --config java
There are 4 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-21-openjdk-amd64/bin/java      2111      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode
* 2            /usr/lib/jvm/java-17-openjdk-amd64/bin/java      1711      manual mode
  3            /usr/lib/jvm/java-21-openjdk-amd64/bin/java      2111      manual mode
  4            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 3
update-alternatives: using /usr/lib/jvm/java-21-openjdk-amd64/bin/java to provide /usr/bin/java (java) in manual mode

javacを切り替えます

# update-alternatives --config javac

There are 4 choices for the alternative javac (providing /usr/bin/javac).

Selection Path Priority Status

------------------------------------------------------------

0 /usr/lib/jvm/java-21-openjdk-amd64/bin/javac 2111 auto mode

1 /usr/lib/jvm/java-11-openjdk-amd64/bin/javac 1111 manual mode

* 2 /usr/lib/jvm/java-17-openjdk-amd64/bin/javac 1711 manual mode

3 /usr/lib/jvm/java-21-openjdk-amd64/bin/javac 2111 manual mode

4 /usr/lib/jvm/java-8-openjdk-amd64/bin/javac 1081 manual mode

Press <enter> to keep the current choice[*], or type selection number: 3

update-alternatives: using /usr/lib/jvm/java-21-openjdk-amd64/bin/javac to provide /usr/bin/javac (javac) in manual mode

# update-alternatives --config javac There are 4 choices for the alternative javac (providing /usr/bin/javac). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/lib/jvm/java-21-openjdk-amd64/bin/javac 2111 auto mode 1 /usr/lib/jvm/java-11-openjdk-amd64/bin/javac 1111 manual mode * 2 /usr/lib/jvm/java-17-openjdk-amd64/bin/javac 1711 manual mode 3 /usr/lib/jvm/java-21-openjdk-amd64/bin/javac 2111 manual mode 4 /usr/lib/jvm/java-8-openjdk-amd64/bin/javac 1081 manual mode Press <enter> to keep the current choice[*], or type selection number: 3 update-alternatives: using /usr/lib/jvm/java-21-openjdk-amd64/bin/javac to provide /usr/bin/javac (javac) in manual mode

# update-alternatives --config javac
There are 4 choices for the alternative javac (providing /usr/bin/javac).

  Selection    Path                                          Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-21-openjdk-amd64/bin/javac   2111      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/javac   1111      manual mode
* 2            /usr/lib/jvm/java-17-openjdk-amd64/bin/javac   1711      manual mode
  3            /usr/lib/jvm/java-21-openjdk-amd64/bin/javac   2111      manual mode
  4            /usr/lib/jvm/java-8-openjdk-amd64/bin/javac    1081      manual mode

Press <enter> to keep the current choice[*], or type selection number: 3
update-alternatives: using /usr/lib/jvm/java-21-openjdk-amd64/bin/javac to provide /usr/bin/javac (javac) in manual mode

javaバージョンを確認します

# java -version

openjdk version "21.0.3" 2024-04-16

OpenJDK Runtime Environment (build 21.0.3+9-Ubuntu-1ubuntu1)

OpenJDK 64-Bit Server VM (build 21.0.3+9-Ubuntu-1ubuntu1, mixed mode, sharing)

# java -version openjdk version "21.0.3" 2024-04-16 OpenJDK Runtime Environment (build 21.0.3+9-Ubuntu-1ubuntu1) OpenJDK 64-Bit Server VM (build 21.0.3+9-Ubuntu-1ubuntu1, mixed mode, sharing)

# java -version
openjdk version "21.0.3" 2024-04-16
OpenJDK Runtime Environment (build 21.0.3+9-Ubuntu-1ubuntu1)
OpenJDK 64-Bit Server VM (build 21.0.3+9-Ubuntu-1ubuntu1, mixed mode, sharing)

javacバージョンを確認します

# javac -version

javac 21.0.3

# javac -version javac 21.0.3

# javac -version
javac 21.0.3

Posted by arkgame

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