I created a jvm project and used coroutines version 0.30.1-eap13 with kotlin 1.3.0-rc-146. When I spin up my main method a basic coroutine, i get the following exception: Exception in thread “main” java.lang.NoClassDefFoundError: android/os/Looper at kotlinx.coroutines.android.HandlerDispatcherKt.<clinit>(HandlerDispatcher.kt:60)

may we see your build file?

<dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-stdlib</artifactId> <version>${kotlin.version}</version> </dependency> <dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-test-junit</artifactId> <version>${kotlin.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.jetbrains.kotlinx</groupId> <artifactId>kotlinx-coroutines-android</artifactId> <version>0.30.1-eap13</version> </dependency>

try running

mvn clean verify

it ran successfully

have you tried a stable version of coroutines and seen if it works?

with 1.3 non-experimental i don’t have a choice to use stable version right?

try using 0.21

last time i used 0.26-eap13, it used to work

hmm, that is quite odd

indeed

You're depending on

kotlinx-coroutines-android