How to start JavaFX 11 application outside IDE?

Question

I downloaded:
- OpenJDK 11.0.2
- JavaFX SDK 11.0.2
Both files are extracted to path C:/Program Files/Java/

OS: Windows 10
IDE:

Answer 1

"Actual" Answer

Some of those errors you've provided indicate a problem with spaces in your arguments (e.g. C:/Program Files/...). Surround %PATH_TO_FX% with quotes: "%PATH_TO_FX%". Then, as you said in a comment, the correct command line for you is:

java -p "%PATH_TO_FX%" --add-modules javafx.controls -jar  

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Rest of Answer

From the information you've provided, it's difficult (for me at least) to tell what exactly the problem is. Instead, I'll give some examples of launching a JavaFX application from the command line, both modular and non-modular.

Let's say you have a project with one class—the main class—named com.example.Main. This class extends Application and displays a simple window. Let's also say that, when the code is modular, the module looks like:

module app {
    requires javafx.controls;
    exports com.example to javafx.graphics;
}

And your project structure looks like this:

\---
    +---out
    |   +---artifacts
    |   |       app-1.0.jar (modular or non-modular)
    |   |
    |   \---classes
    |       |   module-info.class (when modular)
    |       |
    |       \---com
    |           \---example
    |                   Main.class
    |
    \---src
        |   module-info.java (when modular)
        |
        \---com
            \---example
                    Main.java

Then your command line will look like one of the following (Windows oriented):

Non-modular

Exploded Directory

java -p "%PATH_TO_FX%" --add-modules javafx.controls -cp out\classes com.example.Main

Jar File

java -p "%PATH_TO_FX%" --add-modules javafx.controls -jar out\artifacts\app-1.0.jar

Note: Requires Main-Class attribute in the manifest.

Modular

Exploded Directory

java -p "%PATH_TO_FX%;out\classes" -m app/com.example.Main

Jar File

java -p "%PATH_TO_FX%;out\artifacts" -m app/com.example.Main

Or if the Jar was created/updated with --main-class

java -p "%PATH_TO_FX%;out\artifacts" -m app

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Notes:

• The above assumes that is the working directory.
• -p is shorthand for --module-path
• -m is shorthand for --module
• -cp is shorthand for --class-path or -classpath