I am trying to insert into a new record to my Postgresql database using Hibernate and Java Spring Boot.

I am trying to insert into a new record to my Postgresql database using Hibernate and Java Spring Boot.

I have two entities in my Spring Boot application. Catalog and CatalogCategory(a bridging table).
In spring boot 3.3.7 the next code was working as expected:

I have two entities in my Spring Boot application. Catalog and CatalogCategory(a bridging table).
In spring boot 3.3.7 the next code was working as expected:

What I want to achieve

What I want to achieve

I am setting up a microservice using Java Spring Boot. The application runs in a Docker container and connects to a MySQL database on the local machine. For testing purposes, I want to avoid the overhead of MySQL and use an H2 in-memory database for unit tests instead.

I am setting up a microservice using Java Spring Boot. The application runs in a Docker container and connects to a MySQL database on the local machine. For testing purposes, I want to avoid the overhead of MySQL and use an H2 in-memory database for unit tests instead.