Use OpenJDK with IntelliJ IDEA on Fedora

This post explains setting up IntelliJ IDEA to use the OpenJDK on Fedora. It is more for my personal future reference than anything else.

Download the things:

Download the latest “Community” edition of IntelliJ IDEA from its website. cd to the directory where its downloaded, extract the tar ball and start the IDE:
```
$ cd Downloads/
$ tar xvf ideaIC-2021.3.3.tar.gz
$ cd idea-IC-213.7172.25/bin
$ ./idea.sh
```

Optionally, create a launcher for it:

$ cat /usr/local/share/applications/idea.desktop 
[Desktop Entry]
Encoding=UTF-8
Name=Idea
Type=Application
Exec=sh /path/to/idea-IC-213.7172.25/bin/idea.sh
Icon=/path/to/idea-IC-213.7172.25/bin/idea.png
Categories=Programming

Install OpenJDK on Fedora:

$ sudo dnf install -y java-11-openjdk java-11-openjdk-devel

Open IntelliJ IDEA and click on “New Project”.
If no SDK was detected by IntelliJ IDEA, click on the drop-down for “Project SDK”, enter the path /usr/lib/jvm/java-openjdk, and click OK.