Disable query creation from method name - use of projections

I would like to use the Spring Data Projection technique in order to extract from a table only some fields (and not all fields of the table).

As described in the documentation (https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#projections) I created a simple interface, for example:

interface NamesOnly {
  String getFirstname();
  String getLastname();
}

But I have some problems to use it.

Problem 1:

First of all, I would like to use the name findAll() to create a query that finds all rows with only two fields (firstName and lastName):

@Repository
public interface PersonaRepository extends JpaRepository<Persona, Long> {
    List<NamesOnly> findAll();
}

But in this case I have these errors (maybe because findAll() is a method of the JpaRepository):

• implements org.springframework.data.jpa.repository.JpaRepository.findAll
• The return type is incompatible with JpaRepository.findAll()

Problem 2:

Ok, so I try to change the name of the method to findAllOnlyNames():

@Repository
public interface PersonaRepository extends JpaRepository<Persona, Long> {
    List<NamesOnly> findAllOnlyNames();
}

But now I have this error:

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property findAllOnlyNames found for type Persona!

Because Spring tries to create a query from the name.

1) Could it be possible to reuse the method name findAll() without having problems with JpaRepository?

2) Could it be possible to turn off the query creation from the method name (only for some queries, not for all projects or repositories)?