mapstruct / mapstruct/mapstruct-examples

Kotin class java.lang.ClassNotFoundException

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#84 opened on Jul 5, 2020 5 comments 1 reaction 0 assignees View on GitHub

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Dominant language: Java
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Description

I built example project Kotlin Gradle but it showed error "class not found exception"
```

Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: Cannot find implementation for org.mapstruct.example.kotlin.converter.PersonConverter
at org.mapstruct.factory.Mappers.getMapper(Mappers.java:61)
at org.mapstruct.example.kotlin.MainKt.main(Main.kt:10)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
Caused by: java.lang.ClassNotFoundException: Cannot find implementation for org.mapstruct.example.kotlin.converter.PersonConverter
at org.mapstruct.factory.Mappers.getMapper(Mappers.java:75)
at org.mapstruct.factory.Mappers.getMapper(Mappers.java:58)
... 6 more

```

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First steps

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Research direction

Reproduce the Kotlin Gradle example and inspect Main.kt at line 10, where Mappers.getMapper fails to find PersonConverter. Check the generated PersonConverter implementation and runtime classpath, then verify that the example starts without ClassNotFoundException.

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Assessment

Tech stack: java, kotlin
Domain: build-system
Issue type: Bug
Difficulty: 3/5
Estimated time: 1-2 days
Activity status: Stale
Clarity: Needs clarification
Newbie friendliness: 25/100