FirstDao.java

import play.db.jpa.JPA;

public class FirstDao {

    public int dbCall() {
        return JPA.em()
                .createNativeQuery("DELETE FROM table WHERE id=1")
                .executeUpdate();
    }

}

SomeService.java

import play.db.jpa.JPAApi;
import play.libs.F.Promise;

import javax.inject.Singleton;

import static play.libs.F.Promise.promise;

@Singleton
public class SomeService {
    private JPAApi jpaApi;
    private FirstDao firstDao;
    private SecondDao secondDao;

    public SomeService(JPAApi jpaApi, FirstDao firstDao, SecondDao secondDao) {
        this.jpaApi = jpaApi;
        this.firstDao = firstDao;
        this.secondDao = secondDao;
    }


    public Promise<Void> doWork() {
        return promise(() -> jpaApi.withTransaction(() -> {
            firstDao.dbCall();
            secondDao.dbCall();
            return null;
        }), dbExecutionContext);
    }

}

SomeServiceJava567.java

import play.db.jpa.JPAApi;
import play.libs.F.Promise;

import javax.inject.Singleton;

import static play.libs.F.Promise.promise;

@Singleton
public class SomeService {
    private JPAApi jpaApi;
    private FirstDao firstDao;
    private SecondDao secondDao;

    public SomeService(JPAApi jpaApi, FirstDao firstDao, SecondDao secondDao) {
        this.jpaApi = jpaApi;
        this.firstDao = firstDao;
        this.secondDao = secondDao;
    }


    public Promise<Void> doWork() {
        return promise(new F.Function0<Object>() {
            @Override
            public Object apply() throws Throwable {
                return jpaApi.withTransaction(new F.Function0<Object>() {
                    @Override
                    public Object apply() throws Throwable {
                        firstDao.dbCall();
                        secondDao.dbCall();
                        return null;
                    }
                });
            }
        }, dbExecutionContext);
    }

}