NullPointerException使用Spring休眠通用Dao
[英]NullPointerException hibernate Generic Dao with Spring
问题描述
i have a bussiness logic class that try to use a dao method save from a generic Dao this is the code from the bl. 
我有一个业务逻辑类，尝试使用从通用Dao中保存的dao方法，这是bl的代码。
public void setUsuario(Usuario usuario) {
this.usuario = usuario;
usuarioDao.save(usuario);
}
Debugging i found out that user object is filled with data properly and the DaoImpl is this 调试我发现用户对象正确填充了数据，DaoImpl是这个
@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;
}
and this is the generic classes im using. 这是即时通讯使用的通用类。
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();
}
}
could someone please help to understand why i get this error when the object user are use in save(). 有人可以帮助您理解为什么在save（）中使用对象用户时出现此错误的原因。
Thanks. 谢谢。
2 个解决方案
解决方案1
1 2017-08-07 02:10:47
Make sure that container creating dao object bean and injecting in your service class try following-- 确保创建dao对象bean并注入服务类的容器尝试以下操作-
make sure that you Added your spring configuration file/class following tag/ annotation-- 确保您在标签/注释之后添加了spring配置文件/类-
@ComponentScan(BasePackages="fully Qualified dao class name")
or <context:component-scan="fully Qualified dao class name"> 或<context:component-scan="fully Qualified dao class name">
解决方案2
0 已采纳 2017-08-09 19:33:15
好吧，由于所有人的帮助，我的休眠会话bean声明中出现了错误
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