NoClassDefFoundError: kotlin/text/Charsets

[weiyf]

注: [ObjectBox] Starting ObjectBox processor (debug: false, incremental: true)Exception in thread "Thread-509" java.lang.NoClassDefFoundError: kotlin/text/Charsets
	at io.objectbox.reporting.BasicBuildTracker.sendEvent(BasicBuildTracker.kt:166)
	at io.objectbox.reporting.BasicBuildTracker$sendEventAsync$1.run(BasicBuildTracker.kt:143)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: kotlin.text.Charsets
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:419)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
	... 3 more
Caused by: java.lang.ClassNotFoundException: kotlin.text.Charsets

objectboxVersion 2.8.1
kotlinVersion 1.4.21
androidstudio 4.1.2

[greenrobot-team]

Thanks! Can you check that you depend on kotlin-stdlib? Your Android project should be configured like suggested at: https://developer.android.com/kotlin/add-kotlin

If that isn't the issue, please provide a small example project so we can reproduce this!

[greenrobot-team]

OK, I just also got this on one of our test projects. I'm confused since kotlin.text.Charsets does still exist in Kotlin 1.4.21, as it did in the version the plugin is compiled with (1.3.72).

A fix is simple: remove usage of kotlin.text.Charsets in the plugin.

Edit: this happens sporadically when doing clean classes as part of the > Task :test-kotlin:kaptKotlin execution (e.g. use our Kotlin integ tests). The affected code should be called each time, so not sure why it only crashes unreliably.

Edit: Downgrading to the Kotlin version the plugin uses (1.3.72) has no effect. Anyhow, kotlin.text.Charsets exists since Kotlin 1.0. It really appears the whole Kotlin API is sometimes missing. Is this because this code runs in a separate thread?

[greenrobot-team]

This is fixed internally and will ship with the next update. From what I have seen the exception is safe to ignore (it happens in a separate thread) and should not affect how the processor works or the Gradle build completes.

[greenrobot-team]

With 2.9.0 this crash should no longer occur.