Context

• Method constraints validation

• Kotlin

  • Presence of extension function on parameterized type within the validated object

Problem

Given the following code making use of method constraint validation

SimpleFooService.kt

Attempting to execute the code leads to ArrayIndexOutOfBoundsException and the given arguments not being validated:

Preliminary analysis

Debugging reveals that org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider#findExecutableMetaData is retrieving an incorrect JavaBeanExecutable result from JavaBeanHelper when processing the private final void foo.SimpleFooService.someExtensionFunction(java.util.List,int) method:

The extensionFunctionArg argument has the List<String> type associated to it, instead of int

That inconsistency causes AnnotationMetaDataProvider.getTypeParametersCascadingMetaDataForParameterizedType to fail.

Workaround

Workaround is to remove all extension functions on parameterized receiver from the validated class (which may not be desirable).

Build setup

build.gradle.kts