jenv is a tool for managing parallel Versions of Java Development Kits on any Unix based system. It provides a convenient command line interface for installing, switching, removing and listing Candidates.

Please report any bugs and feature request on the GitHub Issue Tracker.

• Easy to manage Java version, such as 1.6, 1.7 and 1.8
• Easy to install java related tools, such as ant, maven, tomcat etc.
• Easy to manager candidate version. Install new version and uninstall the old one.
• Directory is standard, and friendly to IDE
• Easy to extend. You can setup your own jenv on your company to manage development environment.
• Easy to backup your env.
• Bash completion support. Use TAB to complete command name, candidate name and version
• Multi OS support, such as Mac, Linux and Windows(Cygwin)

Open your favourite terminal and enter the following:

$ curl -s get.jvmtool.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 can not redistribute Java SDK, so you should download it from http://www.oracle.com/technetwork/java/javase/downloads/index.html and install. After install please execute following command:

$ mkdir -p $HOME/.jenv/candidates/java
$ ln -s /Library/Java/JavaVirtualMachines/jdk1.7.0_17.jdk/Contents/home $HOME/.jenv/candidates/java/1.7.0_17
$ jenv default java 1.7.0_17

You can also install Java by http url:

$ jenv install java 1.7.0_17 http://xxxx.com/java/java-1.7.0_17-darwin.zip

First view all available candidates:

$ jenv all

Second list available version for the candidate, such as maven candidate:

$ jenv ls maven

Final install the candidate with the version:

$ jenv install maven 3.0.5

In your terminal, input mvn --version to check the installation.

If you want to list all installed candidates, please use following command.

$ jenv ls

All canidate versions are maintained on central repository. To keep updated with central repository, please use:

$ jenv repo update

• use: Use the candidate with the version, such as jenv use maven 3.0.4
• which: Which version for candidate
• pause: Pause candidate usage
• exe: 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 candidate's detail information
• requirements: Display jenv requirements

jenvrc is jenv setup file which contains candidate and the version as following:

   java=1.6.0_45
   maven=3.0.5

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.

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 [email protected]: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.

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