CRDGenerator: Private CustomResource classes are found while scanning but cannot be processed

[baloo42]

Describe the bug

CustomResource classes with private or package-private visability will be found by the CRDGenerator collector. But those cannot be processed by the CRDGenerator api-v2 because it is using reflection to instantiate the CustomResource class without modifying the constructors accessability.

https://github.com/fabric8io/kubernetes-client/blob/main/crd-generator/api-v2/src/main/java/io/fabric8/crdv2/generator/CustomResourceInfo.java#L168

getDeclaredConstructor() does only work with public classes.

Fabric8 Kubernetes Client version

SNAPSHOT

Steps to reproduce

baloo42/crd-generator-maven-examples#11

Expected behavior

We should align the behaviour of the collector and api-v2. Either we filter private and package-private custom resource classes in the collector, or we should modify the accessability of the constructor of the CustomResource in CustomResourceInfo before trying to instantiate it.

Runtime

Kubernetes (vanilla)

Kubernetes API Server version

1.25.3@latest

Environment

Linux

CRD-Generator Maven Plugin Logs

Caused by: java.lang.IllegalAccessException: class io.fabric8.crdv2.generator.CustomResourceInfo cannot access a member of class io.fabric8.crd.maven.example.api.v2.Multiple with modifiers ""
    at jdk.internal.reflect.Reflection.newIllegalAccessException (Reflection.java:392)
    at java.lang.reflect.AccessibleObject.checkAccess (AccessibleObject.java:674)
    at java.lang.reflect.Constructor.newInstanceWithCaller (Constructor.java:490)
    at java.lang.reflect.Constructor.newInstance (Constructor.java:481)
    at io.fabric8.crdv2.generator.CustomResourceInfo.fromClass (CustomResourceInfo.java:168)
    at java.util.stream.ReferencePipeline$3$1.accept (ReferencePipeline.java:197)
    at java.util.stream.ReferencePipeline$2$1.accept (ReferencePipeline.java:179)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining (ArrayList.java:1625)
    at java.util.stream.AbstractPipeline.copyInto (AbstractPipeline.java:509)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:499)
    at java.util.stream.AbstractPipeline.evaluate (AbstractPipeline.java:575)
    at java.util.stream.AbstractPipeline.evaluateToArrayNode (AbstractPipeline.java:260)
    at java.util.stream.ReferencePipeline.toArray (ReferencePipeline.java:616)
    at io.fabric8.crdv2.generator.CRDGenerator.customResourceClasses (CRDGenerator.java:128)
    at io.fabric8.crd.generator.maven.plugin.CrdGeneratorMojo.execute (CrdGeneratorMojo.java:178)

Additional context

operator-framework/java-operator-sdk#2540
#6683

/cc @metacosm