C. Weber questions

C. Weber answers

• How do I Stream<GroupJson> and entire database using JPA?
• The method findOne(Example<S>) in the type QueryByExampleExecutor<Contact> is not applicable for the arguments (Long)
• Spring hibernate CrudRepository make the save method update based on a unique constraint
• Spring H2 Test DB does not reset before each test
• Empty string field as null field
• How can I get child entity id when save a parent entity with cascade