How does JPA find all classes tagged with @Entity?

Question

Java

Good afternoon.
I want to write an analogue of JPA for educational purposes.
I use Tomcat, it has CDI (Weld) and Bean Validation (Hibernate).
Tell me how JPA (if I used it) would find classes with the @Entity annotation?
How does the same Weld find all classes?
I'm interested in the approach. Maybe Weld can help me with this?
Thank you.

Answer 1

When configuring Hibernate / JPA, a list of @Entity classes is specified, or a base package, relative to which the search for classes marked with the @Entity annotation is performed. There is a SomeClass.class.isAnnotationPresent() method for this.
PS: IMHO, writing a JPA analog "for educational purposes" is not a good idea.

Answer 2

Read how JPA/Hibernate are
configured The config file either lists Entity classes or specifies a package

Answer 3

Umm ... what's in the approach? The framework parses your classes and bumping into the @Entity annotation adds the class to the project's Entity's list :)