Improve Error-Message for missing Embedabbles

[lostiniceland]

Description

Following up on the Zulip discussion here: https://quarkusio.zulipchat.com/#narrow/stream/187030-users/topic/Quarkus.203.20changing.20entity-fields.20to.20CompositeTracker.3F

When embedding an type in an entity where the @Embedabble annotation has accidentally been forgotten, a weird error message is shown that gives no clue whats going on.

See attached demo
demo.zip

Running this sample (Quarkus 3.2.4) with ./mvnw verify will yield the following error.

SomeQuarkusTest.test_some:15 » ClassCast Object of type 'class demo.Bar' can't be cast to CompositeTracker

Adding the @Embedabble to class Bar and running the test again completes successfully.

Note: running the "wrong" demo with Quarkus 2.x works without error.

Implementation ideas

Even though this is a clear development mistake it should be easy to detect by a Quarkus BuildStep and provide a better error message. Query the Jandex index for embedded fields a check corresponding types for missing annotation.

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