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我有一個bussiness邏輯類，嘗試使用dao方法保存從一個通用的道，這是來自BL的代碼。NullPointerException休眠與春天Generic Dao
public void setUsuario(Usuario usuario) {
this.usuario = usuario;
usuarioDao.save(usuario);
}
調試我發現，用戶對象適當地填充了數據並且DaoImpl是本
@Component
public class UsuarioDaoImpl extends GenericDaoImpl<Usuario> implements UsuarioDao {
@Override
public Usuario get(String id) throws DataAccessException {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean saveBatchFull(Collection<Usuario> entity, boolean update) throws DataAccessException {
// TODO Auto-generated method stub
return false;
}
@Override
public Usuario get(Long id) throws DataAccessException {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean save(Usuario usuario) throws DataAccessException {
super.save(usuario);
return false;
}
，這是一般類即時通訊使用。
import java.lang.reflect.ParameterizedType;
import java.util.Collection;
import java.util.Iterator;
import org.slf4j.LoggerFactory;
import org.apache.log4j.LogManager;
import org.apache.logging.log4j.*;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.transaction.annotation.Transactional;
public class GenericDaoImpl<T> implements GenericDao<T> {
private static final Logger logger = LogManager.getLogger("GenericDaoImpl");
protected Class<T> domainClass;
// @Autowired(required = true)
protected SessionFactory sessionFactory;
// Para conexion sin Injection Dependency
private Transaction transactionNoID;
public GenericDaoImpl() {
// Constructor default
}
// Obtener el objeto
@SuppressWarnings({ "unchecked", "rawtypes" })
protected Class<T> getDomainClass() {
if (domainClass == null) {
ParameterizedType thisType = (ParameterizedType) getClass().getGenericSuperclass();
domainClass = (Class) thisType.getActualTypeArguments()[0];
}
return domainClass;
}
@SuppressWarnings("unchecked")
@Transactional(readOnly = true)
public T get(Long id) throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
String listQuery;
StringBuilder sb = new StringBuilder(" from ");
sb.append(this.getDomainClass().getName());
sb.append(" entity ");
sb.append(" where id = :id ");
listQuery = sb.toString();
T result = null;
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
result = (T) session.createQuery(listQuery).setLong("id", id).uniqueResult();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
result = (T) session.createQuery(listQuery).setLong("id", id).uniqueResult();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return result;
}
@SuppressWarnings("unchecked")
@Transactional(readOnly = true)
public T get(String id) throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
String listQuery;
StringBuilder sb = new StringBuilder(" from ");
sb.append(this.getDomainClass().getName());
sb.append(" entity ");
sb.append(" where id = :id ");
listQuery = sb.toString();
T result = null;
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
result = (T) session.createQuery(listQuery).setString("id", id).uniqueResult();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
result = (T) session.createQuery(listQuery).setString("id", id).uniqueResult();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return result;
}
@SuppressWarnings("unchecked")
@Transactional(readOnly = true)
public Collection<T> list() throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
String listQuery;
StringBuilder sb = new StringBuilder(" from ");
sb.append(this.getDomainClass().getName());
sb.append(" entity ");
listQuery = sb.toString();
Collection<T> result = null;
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
result = session.createQuery(listQuery).list();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
result = session.createQuery(listQuery).list();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return result;
}
@SuppressWarnings("unchecked")
@Transactional(readOnly = true)
public Collection<T> listById(Long id) throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
String listQuery;
StringBuilder sb = new StringBuilder(" from ");
sb.append(this.getDomainClass().getName());
sb.append(" entity ");
sb.append(" where id = :id ");
listQuery = sb.toString();
Collection<T> result = null;
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
result = session.createQuery(listQuery).setLong("id", id).list();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
result = session.createQuery(listQuery).setLong("id", id).list();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return result;
}
@SuppressWarnings("unchecked")
@Transactional(readOnly = true)
public Collection<T> listById(String id) throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
String listQuery;
StringBuilder sb = new StringBuilder(" from ");
sb.append(this.getDomainClass().getName());
sb.append(" entity ");
sb.append(" where id = :id ");
listQuery = sb.toString();
Collection<T> result = null;
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
result = session.createQuery(listQuery).setString("id", id).list();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
result = session.createQuery(listQuery).setString("id", id).list();
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return result;
}
@Transactional
public boolean save(Object entity) throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
transactionNoID = session.beginTransaction();
session.saveOrUpdate(entity);
transactionNoID.commit();
return true;
} catch (Exception e) {
transactionNoID.rollback();
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
session.saveOrUpdate(entity);
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return false;
}
@Transactional
public boolean saveNoUpdate(Object entity) throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
transactionNoID = session.beginTransaction();
session.save(entity);
transactionNoID.commit();
return true;
} catch (Exception e) {
transactionNoID.rollback();
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
session.save(entity);
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return false;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
@Transactional
@Override
public boolean saveBatchFull(Collection<T> entity, boolean update) throws DataAccessException {
Session session = null;
if (sessionFactory != null) {
session = this.sessionFactory.getCurrentSession();
}
if (session == null) {
session = SessionFactoryUtil.getSessionFactory().openSession();
try {
transactionNoID = session.beginTransaction();
for (Iterator iterator = entity.iterator(); iterator.hasNext();) {
T t = (T) iterator.next();
if (update) {
session.saveOrUpdate(t);
} else {
session.save(t);
}
}
transactionNoID.commit();
return true;
} catch (Exception e) {
transactionNoID.rollback();
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
} finally {
session.close();
}
} else {
try {
for (Iterator iterator = entity.iterator(); iterator.hasNext();) {
T t = (T) iterator.next();
if (update) {
session.saveOrUpdate(t);
} else {
session.save(t);
}
}
return true;
} catch (Exception e) {
e.printStackTrace();
logger.info("Error en la clase: " + this.getClass().getName() + " - " + e.getMessage());
}
}
return false;
}
public SessionFactory getSessionFactory() {
return sessionFactory;
}
@Transactional
public void flush() throws DataAccessException {
sessionFactory.getCurrentSession().flush();
}
}
有人可以請幫助理解爲什麼當對象用戶在save（）中使用時出現此錯誤。
謝謝。
您正在混合容器管理的事務和bean管理的事務，它將不起作用。既然你使用的是spring，你可以按照教程https://spring.io/guides/gs/accessing-data-jpa/ –
@André對不起，即時通訊新的web開發，我發現你的回答非常混亂 – Andres
你不是讓Spring爲您管理交易。你只需要'@ Autowired'和'@ Transaction'。該教程是您需要的一切。刮掉所有內容並閱讀Spring JPA上的其他一些教程，直到您掌握它爲止。你不會走得太遠，試圖讓你的代碼工作。 –