JpaRepository Not supported for DML operations [delete query]

Add @Transactional(org.springframework.transaction.annotation.Transactional) and @Modifying(org.springframework.data.jpa.repository.Modifying) which solved similar issue for me

Try this:

public interface LimitRepository extends JpaRepository<CLimit, Long> {
  @Modifying
  @Query("delete from CLimit l where l.trader.id =:#{#trader.id}")
  void deleteLimitsByTrader(@Param("trader") CTrader trader);
}

Whenever you are trying to modify a record in db, you have to mark it as @Modifying, which instruct Spring that it can modify existing records.

The modifying queries can only use void or int/Integer as return type, otherwise it will throw an exception.

I had the same issue and I tried @afridi's answer which is working fine but bad practice, as far as I understand. you should not use @Transactional annotation in the repository class but service(and implementation) classes. please find the below answer.

LimitServiceImpl.java

import org.springframework.transaction.annotation.Transactional;
...
@Override
@Transactional
public void deleteLimitsByTrader(CTrader trader) {
// here im calling the LimitRepository interface. 
 getEntityRepository().deleteLimitsByTrader(trader);
}

LimitRepository.java

import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
...
public interface LimitRepository extends JpaRepository<CLimit, Long> {

  @Modifying
  @Query("delete from CLimit l where l.trader.id =:#{#trader.id}")
  void deleteLimitsByTrader(@Param("trader") CTrader trader);

}

make sure to use the correct imports.

You forgot to add two annotations above of method .

@Transactional
@Modifying