Load an FXML form using JRuby - jruby

Question

I am trying to load an FXML form from a JRuby script. I can successfully do that from a Jython script. This is the basic Jython code:
from javafx.application import Application
from javafx.fxml import FXMLLoader
from javafx.scene import Scene
class Main(Application):
def start(self, stage):
main_form = self.getClass().getResource('/main.fxml')
self.loader = FXMLLoader(main_form)
root = self.loader.load()
scene = Scene(root)
stage.setScene(scene)
stage.show()
args = []
print Main().class
print args
Application.launch(Main().class, args)
The script executes fine and the form gets shown. The output of the script is:
<type 'org.python.proxies.__main__$Main$0'>
[]
So Main.class() is type 'org.python.proxies.main$Main$0'
This is my attempt to create the equivalent JRuby script:
java_import javafx.application.Application
java_import javafx.fxml.FXMLLoader
java_import javafx.scene.Scene
class Main < Application
attr_accessor :loader, :fxml_form, :scene
def start(stage)
#fxml_form = self.java_class.getResource('/main.fxml')
#loader = FXMLLoader.new(#fxml_form)
root = #loader.load()
#scene = Scene.new(root)
stage.set_scene(#scene)
stage.show()
end
end
args = Array.new()
puts Main.new().java_class
puts args
Application.launch(Main.new().java_class, args)
The output of this script is:
javafx.application.Application
NameError: no method 'launch' for arguments (org.jruby.javasupport.JavaClass,org.jruby.RubyArray) on Java::JavafxApplication::Application
available overloads:
(java.lang.String[])
(java.lang.Class,java.lang.String[])
(root) at /home/uros/NetBeansProjects/JRuby-JavaXF/lib/main.rb:31
So Main.new().java_class is javafx.application.Application and the form never gets loaded. My FXML in both cases is a basic 'hello world' form:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<StackPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="264.0" prefWidth="315.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<children>
<Button mnemonicParsing="false" prefHeight="34.0" prefWidth="89.0" text="Button" />
</children>
</StackPane>
I am on Linux Mint 17. My Jython is 2.7b3 and my JRuby is 1.7.16.1.
[EDIT]
Additional information:
When trying to use the jrubyfx gem like this:
require 'jrubyfx'
class Main < JRubyFX::Application
def start(stage)
with(stage, title: "Hello World!", width: 800, height: 600) do
fxml "main.fxml"
show
end
end
end
Main.launch
I get the following exception:
NameError: cannot initialize Java class javafx.scene.control.ListView
(root) at /home/uros/.rvm/rubies/jruby-1.7.16.1/lib/ruby/gems/shared/gems/jrubyfx-1.1.0-java/lib/jrubyfx/core_ext/precompiled.rb:320
require at org/jruby/RubyKernel.java:1065
(root) at /home/uros/.rvm/rubies/jruby-1.7.16.1/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1
require at /home/uros/.rvm/rubies/jruby-1.7.16.1/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:55
glob at org/jruby/RubyDir.java:242
load_dsl at /home/uros/.rvm/rubies/jruby-1.7.16.1/lib/ruby/gems/shared/gems/jrubyfx-1.1.0-java/lib/jrubyfx/dsl.rb:313
load_dsl at /home/uros/.rvm/rubies/jruby-1.7.16.1/lib/ruby/gems/shared/gems/jrubyfx-1.1.0-java/lib/jrubyfx/dsl.rb:312
require at org/jruby/RubyKernel.java:1065
(root) at /home/uros/.rvm/rubies/jruby-1.7.16.1/lib/ruby/gems/shared/gems/jrubyfx-1.1.0-java/lib/jrubyfx.rb:37
(root) at /home/uros/NetBeansProjects/RubyApplication4/lib/main.rb:1
My Java version:
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) Server VM (build 25.25-b02, mixed mode)

Answer 1

NameError: cannot initialize Java class javafx.scene.control.ListView
was caused by
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
That JRubyFX error was fixed in 1.1.1 (which added java 8 support). 1.1.0 only supported Java 7 (after u6). It should work now using the code you gave in both 7u6+ and 8:
require 'jrubyfx'
class Main < JRubyFX::Application
def start(stage)
with(stage, title: "Hello World!", width: 800, height: 600) do
fxml "main.fxml"
show
end
end
end
Main.launch