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Doctrine DQL, class table inheritance and access to subclass fields

crizzis answers

In Spring Data JPA, a derived find method doesn't use first-level cache while called multiple times in one transaction, but the default findById does
Spring Data Update Many To One Property
How to use JPA CriteriaBuilder selectCase() so that it can have Predicate as result?
Dynamic instantiation in a sub-query is unsupported
Saving nested objects with spring data - using an id as a reference
Hibernate throwing validation exception "wrong column type encountered in column" even when my DDL script and JPA entity are in sync
How to sort by fetched properties with distinct JPA Specifications
ExampleMatcher.withIgnorePath is fetching property path that is ignored
Does JPA return "null" or empty collection for a collection property that is empty in the DB?
Avoid the "no JREs installed in the workspace that are strictly compatible" warning in Eclipse for multiple Java versions