jenv is a tool for managing parallel Versions of Java Development Kits on any system, such as Linux, Mac and Windows. It provides a convenient command line interface for installing, switching, removing and listing candidates. If you have any problem, please join gitter room: https://gitter.im/linux-china/jenv
Open your favourite terminal and enter the following:
$ curl -L -s get.jenv.mvnsearch.org | bash
If the environment needs tweaking for jenv to be installed, the installer will prompt you accordingly and ask you to restart.
Because I cannot redistribute Java SDK, so you should download it from http://www.oracle.com/technetwork/java/javase/downloads/index.html and install by yourself. After installation, please execute the following command:
$ mkdir -p $HOME/.jenv/candidates/java
$ ln -s /Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/home $HOME/.jenv/candidates/java/1.8.0_112
$ jenv default java 1.8.0_112
for Mac user, after you install JDK from dmg file, please execute:
$ jenv install java 1.8.0_112 system
and jenv will link the Java version automatically.
You can also install Java by http url:
$ jenv install java 1.8.0_112 http://xxxx.com/java/java-1.8.0_112.zip
Firstly, view all available candidates:
$ jenv all
Secondly, list available versions for the candidate, such as maven candidate:
$ jenv ls maven
Finally, install the candidate with the specified version:
$ jenv install maven 3.5.3
In your terminal, type mvn --version
to check the installation.
If you want to list all installed candidates, use the following command:
$ jenv ls
For Docker user, your can use silent mode in your Dockerfile as following:
$ JENV_AUTO=true; jenv install maven 3.5.3
The candidate's versions are maintained in the central repository. To keep updated with central repository, please use:
$ jenv repo update
You can clone your jenv between multiple hosts.
jenv clone user@remote-host
jenv clone candidate version user@remote-host
jenv clone user@remote-host canidate version
uninstall
: Uninstall the candidate with the version specified, such as jenv uninstall maven 3.0.4
reinstall
: Reinstall the candidate with the version specified, such as jenv reinstall maven 3.0.5
use
: Use the candidate with the version specified, such as jenv use maven 3.0.4
which
: Check which version for candidatepause
: Pause candidate usageexe
: Execute script under candidate, such as jenv execute tomcat startup.sh
or jenv execute tomee startup.sh
default
: Make the version as default, such as jenv default maven 3.0.4
cd
: Change directory to candidate install directory, such as jenv cd groovy
show
: Display the candidate's detailed informationrequirements
: Display jenv requirementsjenvrc is jenv setup file which contains candidate and the version as following:
java=1.8.0_112
maven=3.5.3
After you enter this directory, jenv will setup environment automatically. Now You can use jenvrc to setup Java environment for each of your individual projects. You can use jenv init to generate jenvrc file.
$jenv init
Note: Line started with # means line comment.
All the scripts are under candidate home and invoked by jenv automatically.
If you want to add custom candidate into jenv, please create candidates_local under $HOME/.jenv/db/ directory and input candidate name.
$jenv add spike 0.0.1
$jenv install spike 0.0.1 git@github.com:linux-china/groovy_scripts.git
Then you can install candidate from git repository, and you can update candidate by following command:
$jenv update spike
If the candidate is absent, jenv will update all git or svn based candidates.
$jenv update
Update all git or svn based candidates.
If you want to integrate jenv with Docker Executable Images, you can use following steps:
create a repository in github
create autorun.sh file to create functions for commands in Docker images:
mvn() {
docker run --rm \
-v $(pwd):/project \
-w /project \
--entrypoint mvn \
maven:3.5.0-jdk-8 $*
}
install candidate from github
execute shell functions in autorun.sh
Please use selfupdate command to get last version and candidate repository.
$ jenv selfupdate
With jenv IDEA plugin, you don't need to setup Java SDK, Maven, and so on, and jenv IDEA plugin can scan jenv directory and setup the settings in IDEA automatically. Please visit http://plugins.jetbrains.com/plugin/?idea&pluginId=7229