Morphia fails to instantiate extended data classes without empty constructor

[richarddd]

Describe the bug

If the class extends a base class morphia fails to instantiate the class. This is due to:

morphia/core/src/main/java/dev/morphia/mapping/experimental/ConstructorCreator.java

Line 68 in 4ba6108

if (constructor.getParameterCount() == model.getProperties().size() && namesMatchProperties(model, constructor)) {

Where constructor.getParameterCount() == model.getProperties().size() won't equal since model.getProperties() can contain properties from super class(es)

abstract class BaseEntity(
    @Id
    val id: ObjectId? = null
)

@Entity
data class Order(
    @Reference(idOnly = true)
    val item: Inventory?,
    val price: Int,
    val quantity: Int
) : BaseEntity()

To Reproduce
Steps to reproduce the behavior:

1. Create an baseClass and an entity inheriting from that base class
2. Run
3. See error No suitable constructor found for type: ...

Expected behavior
The class to be instantiated

Suggestion: As a last resort, use: https://github.com/google/gson/blob/master/gson/src/main/java/com/google/gson/internal/UnsafeAllocator.java to instantiate the class

** Please complete the following information: **

• Server Version: 4.2
• Driver Version: N/A
• Morphia Version: 2.2.1

[richarddd]

Solved by: #1628

[evanchooly]

fixed by PR

[alvileg]

When is this PR coming for the next release?
I am having the same problem and can't progress further.

[evanchooly]

Oof. My apologies. I got caught up in some personal life bits and then hyperfocused on critter and 2.3.0. I'm leaving for a conference soon (where i'll be doing a morphia talk!) but I'll try to push this release out.

[alvileg]

No rush, and thanks for the quick reply!

Good Luck on the conference! 😄