"Generate Native Access" does not work (NoClassDefFoundError:)

P5music

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Aug 23, 2020, 6:18:24 AM8/23/20

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I am adding some native iOS functionality to my CodenameOne app.

I am just at the beginning.

I created this Interface

import com.codename1.system.NativeInterface;

public interface VoiceInput extends NativeInterface {

public boolean isSupported();

}

This is the bare minimum.

When I try to run "Generate Native Access" from the menu I get this, what's wrong? Thanks in advance.

-pre-init

Generating GUI sources

...

Processing GUI builder file: /home/pc/IdeaProjects/myappcp/src/com/myappcp/app/OneContainer.java

Attempting to generate GUI sources for /home/pc/IdeaProjects/myappcp/res/guibuilder/com/myappcp/app/OneContainer.gui with System JAXB

...

Processing GUI builder file: /home/pc/IdeaProjects/myappcp/src/com/myappcp/app/OneContainer.java

Attempting to generate GUI sources for /home/pc/IdeaProjects/myappcp/res/guibuilder/com/myappcp/app/OneContainer.gui with System JAXB

Failed to generate Gui Source with System JAXB. Will attempt using bundled JAXB.

ago 23, 2020 10:02:55 AM com.codename1.build.client.GenerateGuiSources generateGuiSource

INFORMAZIONI: null

/home/pc/IdeaProjects/myappcp/build.xml:529: java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/sun/xml/bind/v2/model/annotation/AnnotationReader

Ant build completed with 3 errors and 2 warnings in 1s at 23/08/20, 10:02

Shai Almog

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Aug 23, 2020, 9:50:17 PM8/23/20

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Which JDK/IDE combination are you using?

P5music

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Aug 24, 2020, 4:45:36 AM8/24/20

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openjdk version "11.0.8" 2020-07-14

OpenJDK Runtime Environment (build 11.0.8+10-post-Ubuntu-0ubuntu120.04)

OpenJDK 64-Bit Server VM (build 11.0.8+10-post-Ubuntu-0ubuntu120.04, mixed mode, sharing)

IntelliJ IDEA 2020.2 (Community Edition)

Build #IC-202.6397.94, built on July 27, 2020

Runtime version: 11.0.7+10-b944.20 amd64

VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.

Linux 5.4.0-42-generic

GC: ParNew, ConcurrentMarkSweep

Memory: 949M

Cores: 4

Non-Bundled Plugins: com.codename1.plugin.intellij

Current Desktop: ubuntu:GNOME

Shai Almog

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Aug 24, 2020, 11:45:06 PM8/24/20

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Thanks. Please file an issue on that. This is due to JDK 9's disastrous breaking down of the JVM. We still have a few dependencies left such as JAXB and JavaFX. Hopefully we'll be able to completely remove both. In the interim it seems that our workaround for the former failed on your setup.

Dave Dyer

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Aug 25, 2020, 12:28:25 PM8/25/20

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I think there's a problem if you have manually relocated some components - the "generate" code

uses some canned/expected paths instead of the actual classpath. It will work if you stick

your native interface definitions into a virgin project.

P5music

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Aug 26, 2020, 5:13:08 AM8/26/20

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You seem to be right but I do not know what has been relocated. I do not think I relocated something, maybe I added some classpaths?

What could I have done?

Shai Almog

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Aug 26, 2020, 10:28:34 PM8/26/20

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Try creating a clean project and create a GUI builder form in that project. Then try to open it in the GUI builder and build it. This might trigger the jaxb download for that project and might let you generate a native interface there. I'm not sure if it will solve the other project but you might be able to use this as a workaround by copying the native code from there.

P5music

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Aug 27, 2020, 4:32:07 AM8/27/20

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What you both say works for a clean project but not for my app project. Those errors are issued and a pink message says "project needs to be compiled first"

Thanks

Dave Dyer

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Aug 27, 2020, 11:53:53 AM8/27/20

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Generate the template code in your clean project, copy to your actual project. Problem solved until next time.

Shai Almog

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Aug 28, 2020, 12:59:43 AM8/28/20

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Do you use the GUI builder in the project?
Did you try it in the past?
That's probably the main difference as this bug relates to the GUI builder which is the only part that uses JAXB.

P5music

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Aug 28, 2020, 4:18:50 AM8/28/20

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No, I did not use that function at all in my project.

Shai Almog

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Aug 29, 2020, 1:43:55 AM8/29/20

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That is odd. Can you think of a reason why your project is different from the test project?

P5music

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Aug 30, 2020, 11:23:58 AM8/30/20

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The project was created before CEF update or other ones.

Do you think I have to create it again? What if I have to recreate it multiple times for every problem shows up?
Is it possible to "clean" the project somehow?

Shai Almog

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Aug 31, 2020, 12:28:21 AM8/31/20

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Did you send a build with the existing project?
If so it might be a new regression in behavior related to CEF. It's possible that the FX update system also solves the JAXB stuff so now that we don't have them we're failing on the jaxb side. This should be fixable although unfortunately not trivial.

P5music

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Aug 31, 2020, 1:48:15 PM8/31/20

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So do I have to do something or I have to wait, I did not understand.

Shai Almog

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Aug 31, 2020, 9:34:30 PM8/31/20

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Since this is a one time thing you have two potential workarounds:

- Use JDK 8 with Java FX (e.g. ZuluFX)

- Use the other project to generate the native code and copy the resulting files into the current project

Since generating native interfaces is a one time process you don't really need to do it often.

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