Lemur crushes game on Android

[octo-kumo]

So I packed my simple project into APK and installed it on an emulator.

But there is no output, so I checked the logs.

It appears that lemur is causing the crash.

02-05 05:11:32.980  4928  4946 E AndroidRuntime: Process: me.kumo.drone.DroneGroundStation, PID: 4928
02-05 05:11:32.980  4928  4946 E AndroidRuntime: java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/script/ScriptEngineManager;
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at com.simsilica.lemur.style.StyleLoader.<init>(StyleLoader.java:72)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at com.simsilica.lemur.style.StyleLoader.<init>(StyleLoader.java:62)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at com.simsilica.lemur.style.BaseStyles.loadStyleResources(BaseStyles.java:72)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at com.simsilica.lemur.style.BaseStyles.loadGlassStyle(BaseStyles.java:62)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at me.kumo.drone.game.DroneGroundStation.simpleInitApp(DroneGroundStation.java:32)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:240)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at com.jme3.app.AndroidHarness.initialize(AndroidHarness.java:479)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at com.jme3.system.android.OGLESContext.onDrawFrame(OGLESContext.java:358)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1580)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1279)
02-05 05:11:32.980  4928  4946 E AndroidRuntime: Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.script.ScriptEngineManager" on path: DexPathList[[zip file "/data/app/me.kumo.drone.DroneGroundStation-LHnCArWktkN3hkxJJtH-zA==/base.apk"],nativeLibraryDirectories=[/data/app/me.kumo.drone.DroneGroundStation-LHnCArWktkN3hkxJJtH-zA==/lib/x86_64, /data/app/me.kumo.drone.DroneGroundStation-LHnCArWktkN3hkxJJtH-zA==/base.apk!/lib/x86_64, /system/lib64, /system/vendor/lib64]]
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
02-05 05:11:32.980  4928  4946 E AndroidRuntime:        ... 10 more

Here is my build.gradle files.

For android

plugins {
    id 'com.android.application'
    id "io.github.0ffz.github-packages" version "1.2.1"
    // Plugin for anonymous inclusion of artifacts hosted in github package registry
}

android {
    compileSdk 32
    defaultConfig {
        applicationId "me.kumo.drone.DroneGroundStation"
        minSdk 22
        targetSdk 32
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    signingConfigs {
        release {
            if (project.hasProperty('APP_RELEASE_STORE_FILE')) {
                storeFile file(APP_RELEASE_STORE_FILE)
                storePassword APP_RELEASE_STORE_PASSWORD
                keyAlias APP_RELEASE_KEY_ALIAS
                keyPassword APP_RELEASE_KEY_PASSWORD
            }
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    configurations.all {
        exclude group: "org.jmonkeyengine", module: "jme3-desktop"
        exclude group: "com.google.errorprone", module: "error_prone_annotations"
    }
}

ext.jmonkeyengineVersion = '3.7.0-stable'

dependencies {
    implementation 'com.google.guava:guava:33.4.0-android'
    implementation 'androidx.appcompat:appcompat:1.4.0'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.1'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    implementation project(path: ':game')
    implementation "org.jmonkeyengine:jme3-core:" + jmonkeyengineVersion
    implementation "org.jmonkeyengine:jme3-android-native:" + jmonkeyengineVersion

}

For main project

plugins {
    id 'java-library'
    id "io.github.0ffz.github-packages" version "1.2.1"
    // Plugin for anonymous inclusion of artifacts hosted in github package registry
}

java {

    sourceCompatibility = '8'
    targetCompatibility = '8'

}

ext.jmonkeyengineVersion = '3.7.0-stable'

dependencies {
    implementation 'org.jmonkeyengine:jme3-core:' + jmonkeyengineVersion
    runtimeOnly 'org.jmonkeyengine:jme3-jogg:' + jmonkeyengineVersion
    runtimeOnly 'org.jmonkeyengine:jme3-plugins:' + jmonkeyengineVersion

    implementation 'org.jmonkeyengine:jme3-effects:' + jmonkeyengineVersion
    implementation 'org.jmonkeyengine:jme3-terrain:' + jmonkeyengineVersion
    implementation 'org.jmonkeyengine:jme3-testdata:' + jmonkeyengineVersion


    implementation 'com.github.stephengold:SkyControl:1.1.0'
    implementation 'com.fazecast:jSerialComm:2.11.0'
    implementation 'com.simsilica:lemur:1.16.0'
//    implementation 'com.simsilica:lemur-proto:1.13.0'
    implementation 'com.github.stephengold:Minie:8.2.0'
}

[octo-kumo]

implementation 'com.google.guava:guava:33.4.0-android' was added to remove build errors complaining about Duplicate class com.google.common.util.concurrent.ListenableFuture

implementation 'com.simsilica:lemur-proto:1.13.0' was commented to remove build errors complaining about duplicate resources inside lemur.

[pspeed42]

Lemur uses groovy for its styling language. It is also possible to configure styles in Java but the default "glass" style is using the groovy-based styling language.

On the Java side, different jars can have the same resources and this is how an extension library like lemur-proto extends the glass style to add styling for list boxes, selectors, and so on. (The components that lemur-proto adds.)

To use the default glass style on Android, it would be necessary to get groovy to work there and to concatenate the glass style groovy file from Lemur core with the one from Lemur-proto.

This also comes up a lot on the jMonkeyEngine forums which you may find better help. (Github does a great job of hiding these notifications from me which is why I'm only just seeing this message.)