Javascript issues with Rhino and Java 17 when calling Java code: IllegalReflectiveAccess

[hvbtup]

There are issues when calling Java libraries from Javascript with Java 17.

With Java 17, it fails with an exception similar to this:
java.lang.IllegalAccessException: class org.mozilla.javascript.MemberBox cannot access class sun.java2d.SunGraphics2D (in module java.desktop) because module java.desktop does not export sun.java2d to unnamed module

With Java 11, it works, but results in a warning:
WARNING: Illegal reflective access by org.mozilla.javascript.MemberBox (...) to method sun.java2d.SunGraphics2D.setColor(java.awt.Color)

This is described here:

https://groups.google.com/g/mozilla-rhino/c/jmNIszUpBAE
ckeditor/ckbuilder#34
mozilla/rhino#462
mozilla/rhino#1269

The last one seems to be the most up-to-date.

Note: This seems to be an issue with Rhino and Java's module system.

A possible workaround is to use the following VM argument:

--add-exports java.desktop/sun.java2d=ALL-UNNAMED

But I think this can only be a short-term workaround.

In our environment, we stumble upon this issue, because in many of our reports, we are accessing a Java barcode library (to be more precise: from IDAutomation) through Javascript. This library needs a java.awt.BufferedImage to render the barcode. We want to prepare that image by filling it all white. To do this, we call the setColor and fillRect methods.
These methods fail with Java 17.

A code excerpt of our barcode JS function:

    var bc = new com.idautomation.datamatrix.DataMatrix();
    ...
    // create image
    var t = java.awt.image.BufferedImage.TYPE_BYTE_INDEXED;
    var siz = bc.getSize();
    var image = new java.awt.image.BufferedImage(siz.width, siz.height, t);

    // get graphic context of image
    var imgGraphics = image.createGraphics();

    imgGraphics.setColor(java.awt.Color.WHITE);
    imgGraphics.fillRect(0, 0, siz.width, siz.height);

    // paint DataMatrix in graphics context of image
    bc.paint(imgGraphics);
    ...
    // get the image's bytes in PNG format
    var baos = new java.io.ByteArrayOutputStream();
    javax.imageio.ImageIO.write(image, "png", baos);
    var bytes = baos.toByteArray();

    return bytes;

You can test this yourself by commenting the lines with bc - the funtion will then just a white rect as PNG bytes, you can display it as a dynamic image.

[hvbtup]

Since this is a Rhino issue, this is related to #732

[claesrosell]

Can you provide a complete stacktrace for this?
I suspect that the error is not with Rhino.

[hvbtup]

See this tiny example report and the stack trace.
red-rectangle.zip

I'm pretty sure this is a Rhino issue.

[speckyspooky]

I would confirm that this is an rhino issue because we have since Java 9 the new JVM module-handling
and with Java 16 some default jars was extracted from JVM to special modules and these classes are not accessible on rhino 1.7.10 by default.
I had an similar issue with BIRT 4.12 and JVM 17 - #1160.

It seems that the newest version 1.17.14 have some fixes on it. But it could be that not all necessary fixes are done - comments of october mozilla/rhino#1269.