javafx - Why relative path doesn't work in JAVA in JAR-file? -


this question has answer here:

i have simple javafx project. consists from:

  • src/app/main.java
  • src/app/controller/maincontroller.java
  • src/app/controller/secondarywindowcontroller.java
  • src/app/view/main.fxml
  • src/app/view/secondarywindow.fxml

the controller maincontroller.java has method (handler of press button):

public void openwindow(actionevent event) {     pane root = null;     try {         system.out.println("url: " + getclass().getresource("../view/secondarywindow.fxml"));         fxmlloader loader = new fxmlloader(getclass().getresource("../view/secondarywindow.fxml") );         root = loader.load();     }     catch(exception e) {         e.getmessage();         e.printstacktrace();     }     if (root != null) {         scene scene = new scene(root,400,100);         stage secstage = new stage();         secstage.settitle("secondary window");         secstage.setscene(scene);         secstage.show();     } }

code getclass().getresource("../view/secondarywindow.fxml") return right url if run project compile files. return null if run project jar-file.

i compile files using:

javac -d bin src\app\main.java javac -d bin src\app\controller\*.java xcopy src\app\view\*.fxml bin\app\view /s /e /d /y

and run compile files using:

java -classpath bin app.main

catalog bin has similar structure of files:

  • bin/app/main.class
  • bin/app/controller/maincontroller.class
  • bin/app/controller/secondarywindowcontroller.class
  • bin/app/view/main.fxml
  • bin/app/view/secondarywindow.fxml

and create jar-file using:

jar cvfm simplefxmlapp.jar manifest.mf -c bin app

manifest.mf

manifest-version: 1.0 created-by: denys selivanov main-class: app.main

why relative path doesn't work in jar-file , getclass().getresource("../view/secondarywindow.fxml") return null ? how repair that?

one of problem's solves keep controllers , views files in 1 catalog , use relative path "secondarywindows.fxml", want keep structure files of project.

and can download project here. link access 30 days.

i see vote close says it's duplicate of this q&a, don't think explains specifics of .., here go:

.. works on resources on filesystem, because .. actual entry on filesystem, points parent directory. not exist within jars, won't work point "parent package" when classes & resources packaged in jar.

solution: if can accept dependency controller class main class, can instead:

main.class.getresource("view/secondarywindow.fxml")

in case you'll need either reference class high enough in packages hierarchy, or use absolute path root package (getclass().getclassloader().getresource("app/view/secondarywindow.fxml") in case apparently).


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