JavaFX wont import

Question

Ok...

• I downloaded the .zip and unzipped it.

• I put the content in the subfolder /lib directly under my working map.

• I typed: import javafx.application.Application; in a file together with a simple hello world - and called the fil GUI.java

• I opened the terminal and navigated to the folder.

• I typed $ javac -cp lib GUI.java
• I typed $ javac -cp /lib GUI.java
• I typed $ javac -cp ./lib GUI.java

...and a dozen of other combinations to set the classpath to include the javafx -jars All i get is:

GUI.java:2: error: package javafx.application does not exist

What is wrong?

I'm using Java 11.0.5, Ubuntu and Emacs.

Answer 1

The JFX SDK you downloaded contains .jar files. You need to put those jars (or at least the ones you need) on the classpath, not the directory containing them. So for example for javafx.application.Application you’d need -classpath lib/javafx.graphics.jar.

Alternatively, you could use Java's module system with something like

javac --module-path lib --add-modules javafx.graphics GUI.java