gluon-mobile plugin cannot handle multi-release jars - gluon

Question

Deploying one of my example JavaFX applications to an Android device via the gluon-mobile Eclipse plugin fails with an IllegalArgumentException in the retrolambda plugin. This is caused by an indirect dependency of my project on jaxb-api-2.3.0.jar which is a multi-release jar. Retrolambda obviously cannot handle the Java 9 parts in this file and instead of just ignoring them throws an exception. How can this be fixed or avoided?
A newer version of retrolambda (2.5.3 instead of 2.5.1) can handle the module-info.class already but not the part in the META-INF/versions/9/...
The problem could be cured by just deleting the META-INF stuff but when I do that manually it is always re-created by the gluon plugin.
Update 1:
Adding
packagingOptions {
exclude '/META-INF/versions/9/javax/xml/bind/ModuleUtil.class'
}
to the android section in the build file does not make any difference. The error message is still the same:
java.lang.IllegalArgumentException
at net.orfjackal.retrolambda.asm.ClassReader.<init>(ClassReader.java:185)
at net.orfjackal.retrolambda.asm.ClassReader.<init>(ClassReader.java:168)
at net.orfjackal.retrolambda.ClassAnalyzer.analyze(ClassAnalyzer.java:25)
at net.orfjackal.retrolambda.Retrolambda$1.visitClass(Retrolambda.java:71)
at net.orfjackal.retrolambda.files.ClasspathVisitor.visitFile(ClasspathVisitor.java:29)
at net.orfjackal.retrolambda.files.ClasspathVisitor.visitFile(ClasspathVisitor.java:11)
at java.nio.file.Files.walkFileTree(Files.java:2670)
at java.nio.file.Files.walkFileTree(Files.java:2742)
at net.orfjackal.retrolambda.Retrolambda.visitFiles(Retrolambda.java:107)
at net.orfjackal.retrolambda.Retrolambda.run(Retrolambda.java:68)
at net.orfjackal.retrolambda.Main.main(Main.java:28)
This can also be verified easily by just running the command line version of retrlambda over the extracted classes of jaxb-api-2.3.0.jar
Update 2:
With Java 9 and the Gluon-VM it fails with:
Execution failed for task ':SingleViewProject - Gluon VMApp:apkDebug'.
> Duplicate files at the same path inside the APK: META-INF/LICENSE.txt
File 1: /Users/mpaus/.m2/repository/org/apache/commons/commons-math3/3.6.1/commons-math3-3.6.1.jar
File 2: /Users/mpaus/.m2/repository/javax/xml/bind/jaxb-api/2.3.0/jaxb-api-2.3.0.jar

Answer 1

jaxb-api-2.3.0.jar is a multi-release jar and the current jfxmobile plugin 1.3.10 can't deal with it.
The plugin, that targets Java 7/8, uses retrolambda to port back to Java 6/7 a given dependency.
Even if you try to remove the module-info.class or the 9 versionMETA-INF.versions.9.javax.xml.bind`, these classes are processed by the retrolambda plugin, and this will lead to the exception posted in the question. Using the latest retrolambda version doesn't help either.
android {
retrolambdaVersion = "2.5.3"
manifest = 'src/android/AndroidManifest.xml'
packagingOptions {
exclude '/module-info.class'
exclude '/META-INF.versions.9.javax.xml.bind/ModuleUtil.class'
}
}
The only way to make it work under Java 8/jfxmobile 1.3.10 is by modifying the plugin, to add the following exception to JFXMobilePlugin:
copyClassesForRetrolambda.include '**/*.class'
copyClassesForRetrolambda.includeEmptyDirs = false
// exception for multi-release jars
copyClassesForRetrolambda.exclude 'META-INF/versions/**/*.class'
copyClassesForRetrolambda.exclude 'module-info.class'
and then build the plugin and use a local snapshot.
The good news is that using the jfxmobile plugin version 2.0.20 and Gluon VM, that targets Java 9+, the above is already included.
If you can switch to Java 9/10, modify your project to use this plugin, create a new project with the Gluon IDE plugin ('single view project with Gluon VM'), or follow this sample, but using the latest version (2.0.20 so far).
buildscript {
repositories {
jcenter()
google()
maven {
url 'http://nexus.gluonhq.com/nexus/content/repositories/releases'
}
}
dependencies {
classpath 'org.javafxports:jfxmobile-plugin:2.0.20'
}
}
apply plugin: 'org.javafxports.jfxmobile'
repositories {
jcenter()
maven {
url 'http://nexus.gluonhq.com/nexus/content/repositories/releases'
}
}
mainClassName = '...'
sourceCompatibility = 1.8
targetCompatibility = 1.8
dependencies {
compile 'com.gluonhq:charm:5.0.0-jdk9'
androidRuntime 'com.gluonhq:charm:5.0.0'
compile 'javax.xml.bind:jaxb-api:2.3.0'
}