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A little late, but I since I bumped into this issue when trying out the OpenCV tutorial for Java and JavaFX, I will share what worked for me.

1. To be able to compile I needed to add the OpenJFX and OpenCV libraries to classpath
2. Not necessary to configure special module compilation - Eclipse handles it well with Java 11
3. To be able to run I created a launch shortcut that adds the VM arguments as below

--module-path /javafx-sdk-11.0.2/lib

--add-modules=javafx.controls,javafx.fxml

--add-exports java.base/jdk.internal.misc=ALL-UNNAMED

A little late, but I since I bumped into this issue when trying out the OpenCV tutorial for Java and JavaFX, I will share what worked for me.

1. To be able to compile I needed to add the OpenJFX and OpenCV libraries to classpath
2. Not necessary to configure special module compilation - Eclipse handles it well with Java 11
3. To be able to run I created a launch shortcut that adds the VM arguments as below

--module-path /javafx-sdk-11.0.2/lib

--add-modules=javafx.controls,javafx.fxml

--add-exports java.base/jdk.internal.misc=ALL-UNNAMED