Upgrade to Java 11

[salmanee]

Hey,

Did anyone manage to build and compile Arduino in JDK9+?

[facchinm]

Hi @salmanee ,
the porting effort to Java9+ has not yet started, but any help in this would be very appreciated!

[salmanee]

Thanks for your response @facchinm ..
We are planning to do this as part of a course project. We managed to build Arduino but we couldn't run it (unable to locate the Java runtime environment). We suspect it has to do with setting up the JREs as those are not supported anymore in Java 11 and we need some help locating this in the build.xml file and replacing it properly.
Any idea how this could be achieved?

Thanks,
Sumaya

[facchinm]

So, to start easily you can try building the "light bundle" package which doesn't contain the JRE (and falls back using the system one).
To achieve this, launch ant build -Dlight_bundle=true .
This also doesn't include the AVR core but it can be safely downloaded using Board Manager.
Then I'm sure there's a problem related with new Java versioning scheme (so a small version parser crashes when launching on Java9+) but most other stuff should be reasonably ok 😉
Let me know it it goes! It would be super cool to merge such a PR!

[salmanee]

Thanks again for your response. I tried building Arduino using the "light bundle". Again the tool got built successfully but I still can't get it to run (It seems that its still looking for JREs as it states that it wasn't able to locate a Java Runtime Enviroment)

[salmanee]

To further explain what we did:

• We installed Java11 and changed the $JAVA_HOME to point to the new jdk folder and managed to build Arduino successfully
• We then used: jdeps --list-deps app/pde.jar arduino-core/arduino-core.jar app/lib/.jar arduino-core/lib/.jar to list the jdk dependencies ==> it seems that JDK removed internal API/com.sun.image.codec.jpeg (we were not sure how to export or replace this dependency)
• We used jlinks to produce a custom runtime for the application: jlink --no-header-files --no-man-pages --compress=2 --strip-debug --add-modules java.base,java.datatransfer,java.desktop,java.logging,java.naming,java.scripting,java.security.jgss,java.sql --output java-runtime
• Finally we ran: java-runtime/bin/java --module-path /Library/Java/JavaVirtualMachines/openjdk-11.0.1.jdk/Contents/Home/lib/ ==> we got the following error message
  java.lang.LayerInstantiationException: Package jdk.internal.jimage in both module java.base and module jrt.fs

We are not sure how to proceed with this.. any help will be greatly appreciated!

[facchinm]

Thanks for the explanation! Does it run without jlink phase, by just running the executable in build/macosx/Arduino.app/... ?
To bundle the full jvm you can build with
ant build -Djava.net.preferIPv4Stack=true -Dplatform=macosx -DMACOSX_BUNDLED_JVM=$PATH/TO/TARGET/JVM

[salmanee]

It doesn't run with the executable. and bundling the full jvm didn't work out either.

It might have to do with the fact that one of the jar files contain an API the was removed in jdk9 (JDK removed internal API/com.sun.image.codec.jpeg) and that's the reason why its not running but Im not sure why the compiler didn't complain about this.

[salmanee]

I think I figured out the issue..

The reason why it's not able to locate a java runtime environment is because com.apple.eawt is removed from jdk9+ and should be replaced with java.awt.desktop ..

I can fix this issue by adding the following statement at compile time:
-XaddExports:java.desktop/com.apple.eawt=ALL-UNNAMED ==> which basically breaks the encapsulation of java.desktop module to access com.apple.eawt ..

my question is how can this statment be added at compile time for Arduino ?

[facchinm]

com.apple.eawt is being used by ThinkDifferent class and here

Arduino/app/src/processing/app/Base.java

Line 143 in b7728be

|| com.apple.eawt.Application.getApplication().isAboutMenuItemPresent()));

. The second snippet can be safely removed if you are not affected by the menubar bug, while the first file should be refactored (maybe with the help of Eclipse?)

[tlk]

Here is an example from Java 10: How to implement About, Preferences, and Quit menu items on MacOS by Alvin Alexander:

import java.awt.*;
import javax.swing.*;

public class JavaAwtDesktop {

    public static void main(String[] args) {
        new JavaAwtDesktop();
    }

    public JavaAwtDesktop() {

        Desktop desktop = Desktop.getDesktop();

        desktop.setAboutHandler(e ->
            JOptionPane.showMessageDialog(null, "About dialog")
        );
        desktop.setPreferencesHandler(e ->
            JOptionPane.showMessageDialog(null, "Preferences dialog")
        );
        desktop.setQuitHandler((e,r) -> {
                JOptionPane.showMessageDialog(null, "Quit dialog");
                System.exit(0);
            }
        );

        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("java.awt.Desktop");
            frame.setSize(new Dimension(600, 400));
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });
    }

}