NoClassDefFoundError with a JAR created with custom shadow JAR task

[akshayamaldhure]

Shadow Version

8.1.1

Gradle Version

------------------------------------------------------------
Gradle 8.3
------------------------------------------------------------

Build time:   2023-08-17 07:06:47 UTC
Revision:     8afbf24b469158b714b36e84c6f4d4976c86fcd5

Kotlin:       1.9.0
Groovy:       3.0.17
Ant:          Apache Ant(TM) version 1.10.13 compiled on January 4 2023
JVM:          11.0.17 (Amazon.com Inc. 11.0.17+8-LTS)
OS:           Mac OS X 14.1.2 aarch64

Expected Behavior

On creating and running a shadow JAR created with ./gradlew :myModule:shadowJarMyBotService, all the code paths should work.

Actual Behavior

The code paths containing the library references from the top level build.gradle and even from the current module itself fail with NoClassDefFoundError error.

Gradle Build Script(s)

// for the module JAR for running functional tests
shadowJar {
    zip64 true
    manifest.attributes["Main-Class"] = "entrypoint.Entrypoint"
    manifest.attributes["Launcher-Agent-Class"] = "org.aspectj.weaver.loadtime.Agent"
    from sourceSets.test.output
    from sourceSets.test.resources
    from sourceSets.main.output
    from sourceSets.main.resources
}

// needed for the Slackbot service
dependencies {
    shadow("com.slack.api:bolt-socket-mode:1.36.1")
    shadow("javax.websocket:javax.websocket-api:1.1")
    shadow("org.glassfish.tyrus.bundles:tyrus-standalone-client:1.19")
    shadow("org.slf4j:slf4j-simple:1.7.36")
}

import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar

// for running the Slackbot service
task shadowJarMyBotService (type: ShadowJar) {
    zip64 true
    archiveFileName = 'my-bot-service.jar'
    manifest.attributes["Main-Class"] = "slackBot.MyBotService"
    project.configurations.shadow.setTransitive(true);
    configurations = [project.configurations.shadow]
    from sourceSets.test.output
    from sourceSets.test.resources
    from sourceSets.main.output
    from sourceSets.main.resources
}