JacksonArbitraryIntrospector used instead of FieldReflectionArbitraryIntrospector

[esfomeado]

Describe the bug

If I set a field to use the JacksonArbitraryIntrospector all the field fields will now use the JacksonArbitraryIntrospector instead the default one.

Your environment

Java 17

FixtureMonkey - 0.4.10

Steps to reproduce

Run invalidIntrospector on https://github.com/esfomeado/fixture-monkey-bug/blob/f5ca2c55e543a04cab279245fddfe6b946f59e5a/src/test/java/com/example/bug/FixtureMonkeyTest.java

Expected behaviour

Should generate the class correctly.

Actual behaviour

Class not generated.

Cannot construct instance of com.example.bug.Condition (no Creators, like default constructor, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information

[seongahjo]

@esfomeado
It fails due to Jackson.
When generating an object by JacksonArbitraryIntrospector, it serializes all of fields and then deserializes.
So in this case, it fails when serialize and deserialize conditions.

In this case @JsonSubTypes and @JsonTypeInfo is needed, but it is not supported in Fixture Monkey yet.
It is supported soon.

fixture-monkey/fixture-monkey-jackson/src/main/java/com/navercorp/fixturemonkey/jackson/generator/ElementJsonSubTypesObjectPropertyGenerator.java

Line 48 in 98cccc3

public final class ElementJsonSubTypesObjectPropertyGenerator implements ObjectPropertyGenerator {

I think JacksonArbitraryIntrospector should be improved, so I'll figure out if any better solutions when improving JacksonArbitraryIntrospector.

[esfomeado]

@seongahjo Sorry, you are correct. It was been a long day.

But I've encountered this issue that I mentioned. I will close this bug in the meantime and I will open it again once I have a better replication.