JsonView with ExceptionHandler throws 500 error in 4.1.2

[kevind-wgu]

Expected Behavior

I call a rest method with the @JSONVIEW annotation. The method throws an error. The error gets handled by my error handler and returns the appropriate response status and body.

Actual Behaviour

Instead of my handled error response being returned I get a 500 error instead. In the logs I see an exception is thrown saying that the the JsonError is incompatible with the expected return type.

09:07:08.770 [io-executor-thread-3] ERROR i.m.http.server.RouteExecutor - Unexpected error occurred: Error encoding object [Not Found] to JSON: Incompatible types: declared root type ([simple type, class test_email_validation.MyObj]) vs `io.micronaut.http.hateoas.JsonError`
io.micronaut.http.codec.CodecException: Error encoding object [Not Found] to JSON: Incompatible types: declared root type ([simple type, class test_email_validation.MyObj]) vs `io.micronaut.http.hateoas.JsonError`
	at io.micronaut.json.codec.MapperMediaTypeCodec.encode(MapperMediaTypeCodec.java:268)
	at io.micronaut.http.server.netty.jackson.JsonViewServerFilter.lambda$doFilter$1(JsonViewServerFilter.java:99)
	at reactor.core.publisher.MonoCallable.call(MonoCallable.java:72)
	at reactor.core.publisher.FluxSubscribeOnCallable$CallableSubscribeOnSubscription.run(FluxSubscribeOnCallable.java:227)
	at io.micronaut.core.propagation.PropagatedContext.lambda$wrap$3(PropagatedContext.java:211)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
	at io.micronaut.core.propagation.PropagatedContext.lambda$wrap$4(PropagatedContext.java:228)
	at io.micronaut.core.propagation.PropagatedContext.lambda$wrap$4(PropagatedContext.java:228)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Incompatible types: declared root type ([simple type, class test_email_validation.MyObj]) vs `io.micronaut.http.hateoas.JsonError`
	at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)
	at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1308)
	at com.fasterxml.jackson.databind.SerializerProvider._reportIncompatibleRootType(SerializerProvider.java:1399)
	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:380)
	at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1568)
	at com.fasterxml.jackson.databind.ObjectWriter._writeValueAndClose(ObjectWriter.java:1273)
	at com.fasterxml.jackson.databind.ObjectWriter.writeValueAsBytes(ObjectWriter.java:1163)
	at io.micronaut.jackson.databind.JacksonDatabindMapper.writeValueAsBytes(JacksonDatabindMapper.java:209)
	at io.micronaut.json.codec.MapperMediaTypeCodec.encode(MapperMediaTypeCodec.java:265)
	... 12 common frames omitted

Steps To Reproduce

1. Create a GET rest endpoint
2. Annotate rest endpoint with JSON view and the appropriate view class
3. rest endpoint should declare a return type other than void.
4. Throw a custom exception
5. Create a ExceptionHandler for the custom exception
6. ExceptionHandler should generate a response with a body of type JsonError.
7. Startup the application, hit the endpoint that throws the custom exception. This should result in a 500 error because JsonError is not of the same type as the rest endpoint return type.

Environment Information

• Mac
• Java 17
• Maven 3.9.4
• Micronaut 4.1.2

Example Application

https://github.com/kevind-wgu/micronaut-jsonview-bug

Version

4.1.2