java.lang.InstantiationError when upgrading to Kotlin 1.7

Java 17 + Kotlin 1.7 + Mockk 1.12.4/Spring Mockk 3.1.1

java.lang.InstantiationError: com.example.demo.UpdateAccountResult
    at jdk.internal.reflect.GeneratedSerializationConstructorAccessor18.newInstance(Unknown Source)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
    at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:48)

It occurred whens using coEvery{} to do some stub, which returns a UpdateAccountResult.Success().

Here UpdateAccountResult is a sealed class, it has some detailed result subclass/sub data classes.

And UpdateAccountResult extends from a base abstract class like this.

abstract class ApiBaseResult {
    @field:JsonProperty("SC")
    val statusCode: String? = null

    @field:JsonProperty("EC")
    val errorCode: String? = null

    @field:JsonProperty("EM")
    val errorMessage: String? = null
}

These codes are working well with Kotlin 1.6.21.

[hantsy]

Any update for this issue, is there any workaround?

[Raibaz]

I’m currently having issues publishing to oss.sonatype.org: https://issues.sonatype.org/browse/OSSRH-83030

As soon as this is resolved, I’ll publish a new release.