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Java Development Environment

Install​

Install Java using Coursier. If you haven't installed Coursier yet, install it first. (Coursier Installation)

Install Java 17​

To install Java 17 (Adoptium),

cs java --jvm adoptium:17

Install Java 11​

To install Java 11 (AdoptOpenJDK),

cs java --jvm adoptium:11

Install Java 8​

To install Java 8 (AdoptOpenJDK),

cs java --jvm adopt:8

It's often convenient to create symbolic links to JDK.

The folders of the JDK installed by Coursier have the version info in it. So if you link them to IDE, you probably need to re-link the new folder whenever you upgrade JDKs. To avoid this hassle, you can use symbolic links to the JDKs instead of the actual folder paths.

List Installed JDKs​

To simplify symlink creation, you can use jdk-sym-link.

bash -c "$(curl -fsSL https://raw.githubusercontent.com/Kevin-Lee/jdk-sym-link/main/.scripts/install.sh)"

The one above should work for both Intel and M1 Macs but if it doesn't. try the JVM version below. 

bash -c "$(curl -fsSL https://raw.githubusercontent.com/Kevin-Lee/jdk-sym-link/main/.scripts/install-jvm.sh)"

Once installation is done, run the following commands to see all installed JDKs.

jdkslink list

The expected result might be something like this.


$ ls -l /Library/Java/JavaVirtualMachines

total 0
drwxr-xr-x  4 root  wheel  128 27 Sep 00:53 adoptopenjdk-8.jdk
drwxr-xr-x  3 root  wheel   96 25 Mar  2019 jdk1.8.0_202.jdk
lrwxr-xr-x  1 root  wheel   59 17 Oct 18:43 jdk11 -> /Users/USERNAME/Library/Caches/Coursier/jvm/adopt@1.11.0-10
lrwxr-xr-x  1 root  wheel   59 14 Oct 00:02 jdk8 -> /Users/USERNAME/Library/Caches/Coursier/jvm/adopt@1.8.0-292


$ ls -l /Users/USERNAME/Library/Caches/Coursier/jvm

total 0
drwxr-xr-x   3 USERNAME  staff   96 17 Oct 18:43 adopt@1.11.0-10
drwxr-xr-x   3 USERNAME  staff   96 26 Sep 16:55 adopt@1.11.0-11
drwxr-xr-x   3 USERNAME  staff   96 26 Sep 17:52 adopt@1.8.0-292
drwxr-xr-x   3 USERNAME  staff   96 21 Mar  2021 graalvm-java11@20.2.0
drwxr-xr-x   3 USERNAME  staff   96  7 Jul 00:54 graalvm-java11@21.1.0
drwxr-xr-x  15 USERNAME  staff  480 26 Sep 21:01 zulu@1.11.0-10
jdkslink slink 11

The expected result might be like


Version(s) found:
[0] adopt@1.11.0-10
[1] zulu@1.11.0-10
[2] adopt@1.11.0-11
[c] Cancel

2

You chose 'adopt@1.11.0-11'.
It will create a symbolic link to 'adopt@1.11.0-11' (i.e. jdk11 -> adopt@1.11.0-11)
and may ask you to enter your password.

Would you like to proceed? (y / n)
y

/Library/Java/JavaVirtualMachines/jdk11: It is found so will be removed and recreated.

/Library/Java/JavaVirtualMachines $ sudo rm jdk11
/Library/Java/JavaVirtualMachines $ sudo ln -s adopt@1.11.0-11 jdk11


Done!

# Before
--------------------------------------
total 0
drwxr-xr-x  4 root  wheel  128 27 Sep 00:53 adoptopenjdk-8.jdk
drwxr-xr-x  3 root  wheel   96 25 Mar  2019 jdk1.8.0_202.jdk
lrwxr-xr-x  1 root  wheel   59 17 Oct 18:43 jdk11 -> /Users/USERNAME/Library/Caches/Coursier/jvm/adopt@1.11.0-10
lrwxr-xr-x  1 root  wheel   59 14 Oct 00:02 jdk8 -> /Users/USERNAME/Library/Caches/Coursier/jvm/adopt@1.8.0-292

======================================

# After
--------------------------------------
total 0
drwxr-xr-x  4 root  wheel  128 27 Sep 00:53 adoptopenjdk-8.jdk
drwxr-xr-x  3 root  wheel   96 25 Mar  2019 jdk1.8.0_202.jdk
lrwxr-xr-x  1 root  wheel   59 17 Oct 18:45 jdk11 -> /Users/USERNAME/Library/Caches/Coursier/jvm/adopt@1.11.0-11
lrwxr-xr-x  1 root  wheel   59 14 Oct 00:02 jdk8 -> /Users/USERNAME/Library/Caches/Coursier/jvm/adopt@1.8.0-292

======================================

Now, let's create the symbolic link for Java 8 as well,

jdkslink slink 8

jEnv​

Install​

brew install jenv 
{ echo $PATH | grep -q "$HOME/.jenv/bin" ; } || { echo 'if type jenv >/dev/null 2>&1; then
  export PATH="$HOME/.jenv/bin:$PATH"
  eval "$(jenv init -)"
else
  echo "No jenv found. Consider using it. https://github.com/jenv/jenv"
fi' >> ~/.zshrc ; }

Once installed, if there is no ~/.jenv/versions, adding JDK to jenv may fail, so create the folder first with the following command.

mkdir -p  ~/.jenv/versions

Add JDK​

Add JDK 11

jenv add /Library/Java/JavaVirtualMachines/jdk11/Contents/Home

Add JDK 8

jenv add /Library/Java/JavaVirtualMachines/jdk8/Contents/Home

Add JDK 17

jenv add /Library/Java/JavaVirtualMachines/jdk17/Contents/Home

Check all jenv linked versions,

jenv versions

e.g.)

* system (set by /Users/USERNAME/.jenv/version)
  1.8
  1.8.0.222
  11
  11.0
  11.0.11
  openjdk64-1.8.0.222
  openjdk64-11.0.11

Set Global Java Version​

To set the global Java version to 11,

jenv global 11

To check,

jenv global
11

jenv versions may show

jenv versions 
  system
  1.8
  1.8.0.222
* 11 (set by /Users/USERNAME/.jenv/version)
  11.0
  11.0.11
  openjdk64-1.8.0.222
  openjdk64-11.0.11

TBD

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