Loading JavaFX code from string

Question

Hi,
Here is my JavaFX code that I put to the SimplePainter.fx file:
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.paint.*;
import javafx.scene.input.*;
import javafx.scene.shape.*;
var elements: PathElement[];
Stage {
    title: "Simple Painter"
    scene: Scene {
        content: Group{
            content: [
                Rectangle{
                    width: 400
                    height: 300
                    fill: Color.WHITE
                    onMousePressed: function( e: MouseEvent ):Void {
                            insert MoveTo {x : e.x, y : e.y } into elements;
                    onMouseDragged: function( e: MouseEvent ):Void {
                            insert LineTo {x : e.x, y : e.y } into elements;
                Path{
                    stroke: Color.BLUE
                    elements: bind elements
}I am trying to use the ScriptEngineManager to evaluate the SimplePainter file:
import java.io.FileReader;
import javax.script.ScriptEngineManager;
var path = "C:/Temp/fx/SimplePainter.fx";
var manager = new ScriptEngineManager();
var engine = manager.getEngineByExtension("fx");
engine.eval(new FileReader(path));It throws AssertionError:
java.lang.AssertionError
at com.sun.tools.javac.jvm.Gen.visitBreak(Gen.java:1631)
at com.sun.tools.javac.tree.JCTree$JCBreak.accept(JCTree.java:1167)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:679)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:714)
However the simple 'println("Hello World!")' code is invoked fine.
Do I do something wrong?
Is it possible to use JavaFX compile methods to execute a JavaFX code from string?
Thanks in advance.

Answer 1

I experimented with that a while ago with JavaFX 1.1, with success: [Creating JavaFX Classes from Java Classes then running?|http://forums.sun.com/thread.jspa?threadID=5368159]
I tried again:
import java.io.*;
import com.sun.javafx.api.JavaFXScriptEngine;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
class RunJavaFXScript
  static String SCRIPT_NAME = "Test.fx";
  public static void main(String[] args)
    // Get the current directory
    File curDir = new File(".");
    // Get the script's file content
    BufferedReader reader = null;
    File fScript = new File(curDir.getAbsolutePath(), SCRIPT_NAME);
    System.out.println("Reading the " + fScript.getAbsolutePath() + " script");
    try
      reader = new BufferedReader(new FileReader(fScript));
    catch (FileNotFoundException e)
      System.err.println("File not found: " + fScript.getAbsolutePath());
      return;
    // Create a script on the fly
    String script = "function Demo() { println('Hello World!'); return 'It works!'; }";
    System.out.println("Getting the engines");
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByExtension("fx");
    System.out.println("Getting the generic ScriptEngine (by extension): " + engine);
    JavaFXScriptEngine fxEngine = (JavaFXScriptEngine) manager.getEngineByName("javafx");
    System.out.println("Getting the JavaFXScriptEngine: " + fxEngine);
    // Try to run it
    try
      System.out.println("Running the script read from a file: " + reader);
      Object readScript = engine.eval(reader);
      System.out.println("Running a built-in script");
      Object internalScript = fxEngine.eval(script);
      Object r = fxEngine.invokeFunction("Demo");
      System.out.println("Returned: " + (String) r);
    catch (Exception e)
      e.printStackTrace();
    finally
      try { reader.close(); } catch (IOException e) {}
}Compiled with:
javac -cp %JAVAFX_HOME%/lib/shared/javafxc.jar RunJavaFXScript.java(with JAVAFX_HOME pointing at javafx-sdk1.1)
Ran with:
java -cp %JAVAFX_HOME%/lib/shared/javafxc.jar;%JAVAFX_HOME%/lib/desktop/javafxgui.jar;%JAVAFX_HOME%/lib/desktop/Scenario.jar;. RunJavaFXScriptIt works:
Reading the E:\Dev\PhiLhoSoft\Java\_QuickExperiments\.\Test.fx script
Getting the engines
Getting the generic ScriptEngine (by extension): com.sun.tools.javafx.script.JavaFXScriptEngineImpl@758fc9
Getting the JavaFXScriptEngine: com.sun.tools.javafx.script.JavaFXScriptEngineImpl@1113708
Running the script read from a file: java.io.BufferedReader@133f1d7
Running a built-in script
Hello World!
Returned: It works!(and it shows a Stage with a small FX script showing an animation).
Now, I try to do the same of JavaFX 1.2: same command line for compiling (except of course pointing to javafx-sdk1.2), run command is:
java -cp . -Djava.ext.dirs=%JAVAFX_HOME%/lib/shared;%JAVAFX_HOME%/lib/desktop RunJavaFXScript(more jars to take in account, I take everything...)
And when I run it I have:
Reading the E:\Dev\PhiLhoSoft\Java\_QuickExperiments\.\Test.fx script
Getting the engines
Getting the generic ScriptEngine (by extension): com.sun.tools.javafx.script.JavaFXScriptEngineImpl@8813f2
Getting the JavaFXScriptEngine: com.sun.tools.javafx.script.JavaFXScriptEngineImpl@1d58aae
Running the script read from a file: java.io.BufferedReader@83cc67
An exception has occurred in the OpenJavafx compiler. Please file a bug at the Openjfx-compiler issues home (https://openjfx-compiler.dev.java.net/Issues) after checking for duplicates. Include the following diagnostic in your report and, if possible, the source code which triggered this problem.  Thank you.
java.lang.AssertionError
        at com.sun.tools.javac.jvm.Gen.visitBreak(Gen.java:1631)
        at com.sun.tools.javac.tree.JCTree$JCBreak.accept(JCTree.java:1167)
        at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:679)
        at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:714)
        at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
        at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:751)
        at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:735)
        at com.sun.tools.javac.jvm.Gen.visitSwitch(Gen.java:1210)
        at com.sun.tools.javac.tree.JCTree$JCSwitch.accept(JCTree.java:943)
        at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:679)
        at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:714)
        at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
        at com.sun.tools.javac.jvm.Gen.genLoop(Gen.java:1076)
        at com.sun.tools.javac.jvm.Gen.visitForLoop(Gen.java:1047)
        at com.sun.tools.javac.tree.JCTree$JCForLoop.accept(JCTree.java:856)
(and so on)So I have the same issue.
Looks like something have been broken in 1.2... :-(
Of course, the tested scripts compile without problem.
If I put only my simple built-in script in the Test.fx file, it works... I can put an empty Stage in the script (it is displayed), but if I add an empty Scene to it, I have the same error.