change java home ubuntu
Автор: CodeGPT
Загружено: 2024-12-03
Просмотров: 1
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changing the `java_home` environment variable in ubuntu is essential if you have multiple java versions installed or if you want to ensure your system uses a specific version of java. below is a detailed tutorial on how to change `java_home` on an ubuntu system.
step 1: check installed java versions
first, you need to check which versions of java are installed on your system. open a terminal and run:
this command will list all installed java versions. the output will look something like this:
step 2: identify the java installation path
the `java_home` variable should point to the directory where java is installed. you can find the installation path of your desired java version using the `readlink` command. for example, if you want to find the path for java 11, you could run:
this will return a path that looks like this:
to set `java_home`, you only need the parent directory:
step 3: set java_home
you can set the `java_home` variable temporarily in your terminal session, or you can set it permanently.
temporary setting
to set `java_home` temporarily (it will be reset when you close the terminal), run:
you can verify that it is set by running:
permanent setting
to set `java_home` permanently, you'll need to add it to your profile file. this can be done by editing the `.bashrc` file for your user or the `/etc/environment` file for system-wide settings.
1. *edit .bashrc (user-specific)*
open the `.bashrc` file in your home directory:
add the following line at the end of the file:
save the file (ctrl + o, enter, ctrl + x to exit).
to apply the changes, run:
2. *edit /etc/environment (system-wide)*
to set `java_home` for all users, edit the `/etc/environment` file:
add the following line:
save and exit the file. you may need to log out and log back in, or restart the system for the changes to take effect.
step 4: verify java_home
to confirm that `java_home` has been set correctl ...
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