Nested objects doesn't work with inner joins and register bean mapper

[jarlah]

I have struggled with making inner joins and registering bean mappers to load nested objects in another project and i decided to make a proof of concept project (https://github.com/jarlah/jdbi3-nested-innerjoin-example/tree/main) for what I am struggling with. It's very very basic, and I hope it's something really stupid I have done wrong on my side and not a bug.

see failing test and code here https://github.com/jarlah/jdbi3-nested-innerjoin-example/blob/main/src/test/java/com/example/jdbi3/NestedObjectTest.java#L24

(the github workflow fails for something completely different. the test fails properly locally)

If there is an existing issue for this problem just close this issue

[jarlah]

[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 10.27 s <<< FAILURE! -- in com.example.jdbi3.NestedObjectTest
[ERROR] com.example.jdbi3.NestedObjectTest.test -- Time elapsed: 0.198 s <<< ERROR!
java.lang.NullPointerException: Cannot read field "id" because "java.util.List.get(int).nestedStuff" is null
	at com.example.jdbi3.NestedObjectTest.test(NestedObjectTest.java:46)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)