persistence/play-java-jpa/src/main/java/play/db/jpa/DefaultJPAApi.java
public JPAApi start() {
    jpaConfig
        .persistenceUnits()
        .forEach(
            persistenceUnit ->
                emfs.put(
                    persistenceUnit.name,
                    Persistence.createEntityManagerFactory(persistenceUnit.unitName)));
    return this;
  }
public JPAApi start() {
    jpaConfig
        .persistenceUnits()
        .forEach(
            persistenceUnit ->
                emfs.put(
                    persistenceUnit.name,
                    Persistence.createEntityManagerFactory(persistenceUnit.unitName)));
    return this;
  }
Initialise JPA entity manager factories.