Create instance of class with internal / private constructor in GOSU language

Question

I want to create an instance of class with only one internal constructor for unit-tests purpose. I am running Guidewire version 10. Getting error on string with .newInstance call:

    var s3ServiceCtor = InternalBucketS3Service.getClass().getDeclaredConstructors().first()
    s3ServiceCtor.setAccessible(true)
    var newInstanceResult = s3ServiceCtor.newInstance({_testClaim}.toArray())
    return newInstanceResult as S3Service

Here is a class I want to create:

class InternalBucketS3Service extends AbstractS3Service {

  private var _claim : Claim

  internal construct(claim : Claim) {
    super(Configuration.S3InternalBucket)
    _claim = claim
  }
  // no more constructors, only methods ...

And I am getting this error:

junit.framework.AssertionFailedError: Exception in constructor: testGeneralS3ServicesCompare (java.lang.IllegalArgumentException
    at jdk.internal.reflect.GeneratedConstructorAccessor141.newInstance(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
    at ru.tinkoff.util.s3.S3TestServiceImplComparisonTest.getRealS3(S3TestServiceImplComparisonTest.gs:59)
    at ru.tinkoff.util.s3.S3TestServiceImplComparisonTest.<init>(S3TestServiceImplComparisonTest.gs:25)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)

How to fix it?

Answer 1

There is another way how to create instance:

var typeInfo = InternalBucketS3Service.TypeInfo
var ctor = typeInfo.Constructors.first().Constructor
return ctor.newInstance({_testClaim}) as S3Service

But seems like it works only for private constructors. In this case i cant use it, need internal.

Am just gonna make constructor public and add @Deprecated to it to mark "for tests only". Please comment if it is actually possible to create internal object in Gosu via reflection.