CODEWITHSUNDEEP
kotlinreactive-programmingspring-data-mongodbspring-mongodb
youngDev
youngDev

Reputation: 339

Spring Data with ReactiveMongoRepository: generic saving

I would like to save some documents with the value containing a generic. And I constantly receive a StackOferflowError.

Here is a fragment of my model class

data class MyDocument {
    val errors: List<SomeError> = emptyList()
}

SomeError is in interface that should be implemented by different types of errors including ValidationError

interface SomeError

data class ValidationError<T: Any>(val objectType: KClass<T>, val objectId: String) : SomeError

I am trying to save my object with non-empty list of errors (using ReactiveMongoRespoitory):

myDocumentRepository.save(MyDocument(
     errors = listOf( 
     ValidationError<MyDocument>(objectType = MyDocument::class, objectId = "somedoc")) //as SomeError did not help
))

Do you know how I can correct it?

This is a psrt of the Stack trace:

 java.lang.StackOverflowError
at java.base/java.util.HashMap.putVal(HashMap.java:624)
at java.base/java.util.HashMap.putMapEntries(HashMap.java:510)
at java.base/java.util.HashMap.putAll(HashMap.java:780)
at org.springframework.data.util.TypeDiscoverer.resolveType(TypeDiscoverer.java:168)
at org.springframework.data.util.ParameterizedTypeInformation.calculateTypeVariables(ParameterizedTypeInformation.java:269)

Upvotes: 0

Views: 299

Answers (1)

Greyshack
Greyshack

Reputation: 1971

You can do something like this:

import org.springframework.data.annotation.Transient

data class ValidationError private constructor(
  private val type: String,
  val objectId: String
) : SomeError {
  constructor(type: KClass<*>, objectId: String) : this(type.qualifiedName!!, objectId)

  @delegate:Transient
  val objectType by lazy {
    this.javaClass.classLoader.loadClass(type).kotlin
  }
}

Store KClass internally as fully qualified name.

Upvotes: 1

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