JPA忽略更新空值配置

import org.hibernate.bytecode.enhance.spi.LazyPropertyInitializer;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.event.internal.DefaultMergeEventListener;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.property.access.internal.PropertyAccessStrategyBackRefImpl;
import org.hibernate.type.Type;

import java.util.Map;

public class IgnoreNullEventListener extends DefaultMergeEventListener {
 
    public static final IgnoreNullEventListener INSTANCE = new IgnoreNullEventListener();
 
    @Override
    protected void copyValues(EntityPersister persister, Object entity, Object target, SessionImplementor source, Map copyCache) {
        //源目标
        Object[] original = persister.getPropertyValues( entity );
        //存储目标
        Object[] targets = persister.getPropertyValues(target);
 
        Type[] types = persister.getPropertyTypes();

        Object[] copied = new Object[original.length];
        for ( int i = 0; i < types.length; i++ ) {
            if ( original[i] == null ||
                    original[i] == LazyPropertyInitializer.UNFETCHED_PROPERTY ||
                    original[i] == PropertyAccessStrategyBackRefImpl.UNKNOWN
            ){
                copied[i] = targets[i];
            } else {
                copied[i] = types[i].replace( original[i], targets[i], source, target, copyCache );
            }
        }
        persister.setPropertyValues( target, copied );
    }
}

 

import org.hibernate.event.service.spi.EventListenerRegistry;
import org.hibernate.event.spi.EventType;
import org.hibernate.internal.SessionFactoryImpl;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;

@Configuration
public class HibernateListenerConfigurer {
    @PersistenceUnit
    private EntityManagerFactory emf;
 
    @PostConstruct
    protected void init() {
        SessionFactoryImpl sessionFactory = emf.unwrap(SessionFactoryImpl.class);
        EventListenerRegistry registry = sessionFactory.getServiceRegistry().getService(EventListenerRegistry.class);
        registry.getEventListenerGroup(EventType.MERGE).clear();
        registry.getEventListenerGroup(EventType.MERGE).prependListener(IgnoreNullEventListener.INSTANCE);
    }
}