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I upgraded from Spring Boot 2.0.6 to 2.1.3 and now my test beans defined in mockk suddenly stopped working.
```
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class com.example.core.feature.general.MyService$ByteBuddy$XNiBjGz8$ByteBuddy$rk2gOXmp: Common causes of this problem include using a final class or a non-visible class; nested exception is org.springframework.cglib.core.CodeGenerationException: java.lang.NoClassDefFoundError--&gt;com/example/core/feature/general/MyService$ByteBuddy$XNiBjGz8$ByteBuddy$rk2gOXmp
```
I found this:
<https://github.com/raphw/byte-buddy/issues/486>

Could it be somehow related to ByteBuddy? I know that Spring Boot now supports Java 11 for the first time.

This is how I define my test mocks.. used to work perfectly:
```
@Bean
fun myService() = mockk&lt;MyService&gt;(relaxed = true)
```

Alrighty, can be fixed by upgrading MockK to the latest. mockk 1.9 upgrades byte buddy to similar version used throughout spring which eliminates this bug.

You might want to use SpringMockK: <https://github.com/Ninja-Squad/springmockk>