The Joys of setting up JavaFX in Eclipse IDE (but it actually worked at the end of it all)

The installation of a version of Eclipse required JDK version 1.8 (aka JDK 8), and Eclipse Neon.
I spent way too much time getting JavaFX to work on Eclipse on my Mac.
Here is the original error in Eclipse when trying to import JavaFX:



The official error I was getting when trying to use the program was something like: java.lang.NoClassDefFoundError: javafx/application/Application

Notice the red underline underneath javafx.application.Application; and the "extends Application"

I was not able to use JavaFX in my version of Eclipse. It took me a while to realize that on the website for the JavaFX installation in Eclipse (e(fx)clipse: https://www.eclipse.org/efxclipse/install.html#for-the-lazy) they did not provide the web address.

There is a separate website to install a the Eclipse IDE with all the packages pre-installed (https://efxclipse.bestsolution.at). I chose the "Get Started Fast" option.

Try to install a version of Eclipse with JavaFX already installed. After installing the 380 MB file, I moved the file to my applications folder, to be met with this:

"Eclipse" is damaged and can't be opened. You should move it to the Trash.

The program is quarantined and you must use these commands in the terminal to un-quarantine it:

1. Open the terminal and make the working directory the file with Eclipse (use cd \path to eclipse .... which is \Applications in my case since I moved Eclipse there)

2. type in: $ xattr Eclipse.app/

You should see com.apple.quarantine

3. Remove the quarantine with xattr -d com.apple.quarantine Eclipse.app/

Opening the Eclipse launcher I found this error:

An error has occurred. See the log file.  ...Eclipse/metadata/log

To fix, right click on the Eclipse icon, go to show package contents, then go to Contents --> Eclipse --> Eclipse.ini. To change the eclipse.ini file, add in where my virtual machine (JVM) is located. This site explained it well. A command needed to be added before vmargs:

-vm

/Library/Java/JavaVirtualMachines/jdk1.8.0_251.jdk/Contents/Home/bin

If you did not point the ini file to JVM 1.8 you will see this error message:

It finally worked:

Yea!