How to access JavaFx class library from Kawa?

Discussion:

Arie van Wingerden

2018-10-28 12:56:42 UTC

Hi,

when trying to run your JavaFx example from here:
https://per.bothner.com/blog/2011/JavaFX-using-Kawa-intro/ I get errors
like: Exception in thread "main" java.lang.NoClassDefFoundError:
javafx/geometry/Orientation.

This is understandable, since I only unpacked JavaFx in a folder, but I
don't know how to inform Kawa how to find JavaFx stuff.

As you may guess I am not at all acquainted with Java :)

I am on Windows 10 and have OpenJdk 11.08 and JavaFx 11.
Also, I added the bin dir of openjdk to my system path.

So, please tell me how to enable using JavaFx as well ...

Many thanks!

/Arie

Sudarshan S Chawathe

2018-10-28 13:43:41 UTC

Permalink

Post by Arie van Wingerden
https://per.bothner.com/blog/2011/JavaFX-using-Kawa-intro/ I get errors
javafx/geometry/Orientation.
This is understandable, since I only unpacked JavaFx in a folder, but I
don't know how to inform Kawa how to find JavaFx stuff.

If you set CLASSPATH for Java one way or the other (environment
variable, command-line option, ...) to include the JavaFX .jar files
then you should be able to use JavaFX from Kawa as well. At least, that
has been my experiance on a standard Debian-based setup.

The CLASSPATH syntax allows using "*" to indicate "all jars in
directory" which I find useful in such cases to avoid having to
enumerate jars individually.

Regards,

-chaw

Arie van Wingerden

2018-10-28 14:21:41 UTC

Permalink

Hi Chaw,

thx!

Now tried this:
set CLASSPATH=E:\Programs\openjdk\lib\*;E:\Programs\openjfx\lib\*;.\*
last one is for jars in current dir.

But it still fails because it cannot find javafx/geometry/Orientation.

In openjfx\lib I see:
javafx-swt.jar
javafx.base.jar
javafx.controls.jar
javafx.fxml.jar
javafx.graphics.jar
javafx.media.jar
javafx.properties
javafx.swing.jar
javafx.web.jar
src.zip

But no "geometry" or similar.

/Arie

Post by Sudarshan S Chawathe

If you set CLASSPATH for Java one way or the other (environment
variable, command-line option, ...) to include the JavaFX .jar files
then you should be able to use JavaFX from Kawa as well. At least, that
has been my experiance on a standard Debian-based setup.
The CLASSPATH syntax allows using "*" to indicate "all jars in
directory" which I find useful in such cases to avoid having to
enumerate jars individually.
Regards,
-chaw

Arie van Wingerden

2018-10-28 15:19:07 UTC

Permalink

With a bit of trial and error I got it to work.

Now, when I start a command prompt for Kawa, I initially set an environment
variable:
set KAWA_USERPATH =
E:\Programs\openjfx\lib\javafx.base.jar;E:\Programs\openjfx\lib\javafx.controls.jar;E:\Programs\openjfx\lib\javafx.fxml.jar;E:\Programs\openjfx\lib\javafx.graphics.jar;E:\Programs\openjfx\lib\javafx.media.jar;E:\Programs\openjfx\lib\javafx.swing.jar;E:\Programs\openjfx\lib\javafx.web.jar;E:\Programs\openjfx\lib\javafx-swt.jar

Also I slightly modified kawa.bat and add my path to KAWA-EXTRA-PATH:
set KAWA_EXTRA_PATH =
"%KAWA_HOME%\lib\jline.jar;%KAWA_HOME%\lib\domterm.jar;%KAWA_HOME%\lib\servlet.jar;"%KAWA_USERPATH%

In this way it works!

Please tell me if there is a more elegant way to do this ...

Thx!

/Arie

Post by Arie van Wingerden
Hi Chaw,
thx!
set CLASSPATH=E:\Programs\openjdk\lib\*;E:\Programs\openjfx\lib\*;.\*
last one is for jars in current dir.
But it still fails because it cannot find javafx/geometry/Orientation.
javafx-swt.jar
javafx.base.jar
javafx.controls.jar
javafx.fxml.jar
javafx.graphics.jar
javafx.media.jar
javafx.properties
javafx.swing.jar
javafx.web.jar
src.zip
But no "geometry" or similar.
/Arie

Post by Sudarshan S Chawathe

If you set CLASSPATH for Java one way or the other (environment
variable, command-line option, ...) to include the JavaFX .jar files
then you should be able to use JavaFX from Kawa as well. At least, that
has been my experiance on a standard Debian-based setup.
The CLASSPATH syntax allows using "*" to indicate "all jars in
directory" which I find useful in such cases to avoid having to
enumerate jars individually.
Regards,
-chaw

Arie van Wingerden

2018-10-28 15:21:52 UTC

Permalink

Hi Chaw,

that's weird, since I got it to work without having that :)
See my previous post listing all jars I needed obviously.

Thx!

Post by Arie van Wingerden
With a bit of trial and error I got it to work.
Now, when I start a command prompt for Kawa, I initially set an
set KAWA_USERPATH =
E:\Programs\openjfx\lib\javafx.base.jar;E:\Programs\openjfx\lib\javafx.controls.jar;E:\Programs\openjfx\lib\javafx.fxml.jar;E:\Programs\openjfx\lib\javafx.graphics.jar;E:\Programs\openjfx\lib\javafx.media.jar;E:\Programs\openjfx\lib\javafx.swing.jar;E:\Programs\openjfx\lib\javafx.web.jar;E:\Programs\openjfx\lib\javafx-swt.jar
set KAWA_EXTRA_PATH =
"%KAWA_HOME%\lib\jline.jar;%KAWA_HOME%\lib\domterm.jar;%KAWA_HOME%\lib\servlet.jar;"%KAWA_USERPATH%
In this way it works!
Please tell me if there is a more elegant way to do this ...
Thx!
/Arie

Post by Arie van Wingerden

Post by Arie van Wingerden
https://per.bothner.com/blog/2011/JavaFX-using-Kawa-intro/ I get

errors

Post by Arie van Wingerden
javafx/geometry/Orientation.
This is understandable, since I only unpacked JavaFx in a folder, but I
don't know how to inform Kawa how to find JavaFx stuff.

If you set CLASSPATH for Java one way or the other (environment
variable, command-line option, ...) to include the JavaFX .jar files
then you should be able to use JavaFX from Kawa as well. At least, that
has been my experiance on a standard Debian-based setup.
The CLASSPATH syntax allows using "*" to indicate "all jars in
directory" which I find useful in such cases to avoid having to
enumerate jars individually.
Regards,
-chaw

Arie van Wingerden

2018-10-29 07:22:15 UTC

Permalink

During my search for a solution, I found out that kawa.bat uses an
unnecessary construction:
set
KAWA_EXTRA_PATH="%KAWA_HOME%\lib\jline.jar;%KAWA_HOME%\lib\domterm.jar;%KAWA_HOME%\lib\servlet.jar"

This can be much shorter and easier and less error prone using the asterisk:
set KAWA_EXTRA_PATH=%KAWA_HOME%\lib\*

Post by Arie van Wingerden
Hi Chaw,
that's weird, since I got it to work without having that :)
See my previous post listing all jars I needed obviously.
Thx!

Post by Arie van Wingerden

Post by Arie van Wingerden
https://per.bothner.com/blog/2011/JavaFX-using-Kawa-intro/ I get

errors

Post by Arie van Wingerden
javafx/geometry/Orientation.
This is understandable, since I only unpacked JavaFx in a folder, but

Post by Arie van Wingerden
don't know how to inform Kawa how to find JavaFx stuff.

If you set CLASSPATH for Java one way or the other (environment
variable, command-line option, ...) to include the JavaFX .jar files
then you should be able to use JavaFX from Kawa as well. At least, that
has been my experiance on a standard Debian-based setup.
The CLASSPATH syntax allows using "*" to indicate "all jars in
directory" which I find useful in such cases to avoid having to
enumerate jars individually.
Regards,
-chaw

Sudarshan S Chawathe

2018-10-28 15:18:45 UTC

Permalink

Post by Arie van Wingerden
set CLASSPATH=E:\Programs\openjdk\lib\*;E:\Programs\openjfx\lib\*;.\*
last one is for jars in current dir.
But it still fails because it cannot find javafx/geometry/Orientation.
javafx-swt.jar
javafx.base.jar
javafx.controls.jar
javafx.fxml.jar
javafx.graphics.jar
javafx.media.jar
javafx.properties
javafx.swing.jar
javafx.web.jar
src.zip
But no "geometry" or similar.
/Arie

The CLASSPATH should include jfxrt.jar, which has the geometry package.
In my setup, that file's location is (not the "ext" subdirectory):

/usr/share/java/openjfx/jre/lib/ext/jfxrt.jar

Regards,

-chaw