Migrating Kotlin Jar/AppEngine Project: Exception in thread “Timer-0”

[adam-hurwitz]

Overview

There is an issue when attempting to migrate a Kotlin AppEngine project from an old MacBook Pro (MBP) to a new MBP, when running the Main method and building a .jar file locally.

The Main method in IntelliJ fails intermittently on the new MBP. The old .jar runs as expected on the new MBP, and the new .jar runs as expected on the old MBP.

Expected

1. Run existing local .jar file from Kotlin project on the old MBP.
2. Clone Kotlin project from GitHub repository into local IntelliJ project on new MBP.
3. Build .jar on new MBP.
4. Run .jar on new MBP.
5. Host .jar on Google AppEngine instance.

Observed

1. Running .jar on existing MBP works as expected.
2. Running main method with the same code runs intermittently on the new MBP after the GitHub repo is cloned locally.

Error

The Main method runs on the old MBP as expected, but not on the new MBP with the following error.

Exception in thread "Timer-0" com.google.cloud.storage.StorageException: 401 Unauthorized
at com.google.cloud.storage.spi.v1.HttpStorageRpc.translate(HttpStorageRpc.java:229)
at com.google.cloud.storage.spi.v1.HttpStorageRpc.create(HttpStorageRpc.java:310)
at com.google.cloud.storage.StorageImpl$3.call(StorageImpl.java:196)
at com.google.cloud.storage.StorageImpl$3.call(StorageImpl.java:193)
at com.google.api.gax.retrying.DirectRetryingExecutor.submit(DirectRetryingExecutor.java:105)
at com.google.cloud.RetryHelper.run(RetryHelper.java:76)
at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:50)
at com.google.cloud.storage.StorageImpl.internalCreate(StorageImpl.java:192)
at com.google.cloud.storage.StorageImpl.create(StorageImpl.java:154)
at content.SaveContentKt.saveContent(SaveContent.kt:38)
at content.ContentTasks.generateContent(ContentTasks.kt:55)
at content.ContentTasks.run(ContentTasks.kt:41)
at java.base/java.util.TimerThread.mainLoop(Timer.java:556)
at java.base/java.util.TimerThread.run(Timer.java:506)
Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 401 Unauthorized
at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:150)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:554)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:474)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:591)
at com.google.cloud.storage.spi.v1.HttpStorageRpc.create(HttpStorageRpc.java:307)
... 12 more

Configuration

The gradle-wrapper.properties Gradle, IntelliJ Preferences Gradle JVM, Project SDK, Run/Debug Configurations JRE, and Project language level versions are the same across both machines.

Preferences > Gradle

• Use Gradle from: 'gradle-wrapper.properties' file(Gradle 6.0.1)

• Gradle JVM: Library/Java/JavaVirtualMachines/12.0.1

File > Project Structure... > Project

• Project SDK: 12.0.1
• Project language level: 11

Running .jar file: Project Structure > Project Settings > Artifacts > Add > JAR > From modules with dependencies...

• Module: coinverse-media.main
• Main Class: Initialization

Lastly, build artifact and run .jar file.

build.gradle

buildscript {
    ext.kotlin_version = '1.3.61'

    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

plugins {
    id 'java'
    id 'org.jetbrains.kotlin.jvm' version '1.2.51'
}

version '1.0-SNAPSHOT'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
    implementation 'com.squareup.retrofit2:retrofit:2.7.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.7.0'
    implementation 'com.squareup.retrofit2:adapter-rxjava:2.7.0'
    implementation 'com.google.firebase:firebase-admin:6.12.0'
    implementation 'com.google.cloud:google-cloud-storage:1.102.0'
    implementation 'com.google.apis:google-api-services-youtube:v3-rev20190827-1.30.1'
}

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

Attempted Solutions

1. Invalidate Caches / Restart...: This appears to fix the issue for a few times running the Main method, then the error continues to show.
2. ./gradlew clean build
3. Gradle > Reimport All Gradle Projects
4. Updating to the latest Gradle version.
5. Ensure existing MBP and new MBP are running on the same IntelliJ/Project/Run configurations.
6. Potentially related build dependency conflict issue: Guava Dependency Breaking Jar Built With Kotlin.

Build Data

• Build scan results
• Stack trace

6:09:42 PM: Executing task 'assemble'...

Task :compileKotlin UP-TO-DATE

Task :compileJava NO-SOURCE

Task :processResources NO-SOURCE

Task :classes UP-TO-DATE

Task :inspectClassesForKotlinIC UP-TO-DATE

Task :jar UP-TO-DATE

Task :assemble UP-TO-DATE

BUILD SUCCESSFUL in 75ms
3 actionable tasks: 3 up-to-date
6:09:42 PM: Task execution finished 'assemble'.

• Hidden files
  

Here is the StackOverflow post. I'll update each platform once the solution is found.