0
我已经对此错误进行了研究，但仍找不到合适的解决方案。这里是我的代码：hibernate.LazyInitializationException：无法长期初始化角色集合
配置：
package com.ambre.pta.config;
import javax.sql.DataSource;
import org.apache.commons.dbcp2.BasicDataSource;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.annotation.PropertySources;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.orm.hibernate4.HibernateTransactionManager;
import org.springframework.orm.hibernate4.LocalSessionFactoryBuilder;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import com.ambre.pta.dao.MenuDAO;
import com.ambre.pta.dao.MenuDAOImpl;
import com.ambre.pta.dao.RoleDAO;
import com.ambre.pta.dao.RoleDAOImpl;
import com.ambre.pta.dao.UtilisateurDAO;
import com.ambre.pta.dao.UtilisateurDAOImpl;
@Configuration
@ComponentScan("com.ambre.pta")
@EnableTransactionManagement
@PropertySources({
@PropertySource("classpath:fr/global.properties"),
@PropertySource("classpath:fr/main.properties"),
@PropertySource("classpath:fr/admin.properties"),
@PropertySource("classpath:fr/referentiel.properties")
})
public class ApplicationContextConfig {
@Bean
public static PropertySourcesPlaceholderConfigurer properties() {
return new PropertySourcesPlaceholderConfigurer();
}
@Bean(name = "viewResolver")
public InternalResourceViewResolver getViewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/views/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
@Bean(name = "dataSource")
public DataSource getDataSource() {
BasicDataSource dataSource = new BasicDataSource();
dataSource.setDriverClassName("oracle.jdbc.driver.OracleDriver");
dataSource.setUrl("jdbc:oracle:thin:@localhost:1521:xe");
dataSource.setUsername("pta");
dataSource.setPassword("pta");
return dataSource;
}
@Autowired
@Bean(name = "sessionFactory")
public SessionFactory getSessionFactory(DataSource dataSource) {
LocalSessionFactoryBuilder sessionBuilder = new LocalSessionFactoryBuilder(dataSource);
sessionBuilder.scanPackages("com.ambre.pta.model");
return sessionBuilder.buildSessionFactory();
}
@Autowired
@Bean(name = "transactionManager")
public HibernateTransactionManager getTransactionManager(SessionFactory sessionFactory) {
HibernateTransactionManager transactionManager = new HibernateTransactionManager(sessionFactory);
return transactionManager;
}
@Autowired
@Bean(name = "utilisateurDao")
public UtilisateurDAO getUtilisateurDao(SessionFactory sessionFactory) {
return new UtilisateurDAOImpl(sessionFactory);
}
@Autowired
@Bean(name = "menuDao")
public MenuDAO getMenuDao(SessionFactory sessionFactory) {
return new MenuDAOImpl(sessionFactory);
}
@Autowired
@Bean(name = "roleDao")
public RoleDAO getRoleDao(SessionFactory sessionFactory) {
return new RoleDAOImpl(sessionFactory);
}
}
型号：
@Entity
@Table(name = "menu")
public class Menu {
@Id
@SequenceGenerator(name="s_menu", sequenceName="s_menu", allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="s_menu")
private int menu_id;
private Integer gmnu_code;
private String menu_lib;
private Integer menu_ordre;
private Integer menu_visible;
private Integer menu_deleted;
private Integer menu_parent;
private String menu_controlleur;
private String menu_navigation;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "role_menu", joinColumns = { @JoinColumn(name = "menu_id") }, inverseJoinColumns = { @JoinColumn(name = "role_code") })
private Set<Role> roles = new HashSet<Role>();
public Menu() {
super();
}
public Menu(Integer gmnu_code, String menu_lib, Integer menu_ordre, Integer menu_visible, Integer menu_deleted, Integer menu_parent, String menu_controlleur, String menu_navigation) {
super();
this.gmnu_code = gmnu_code;
this.menu_lib = menu_lib;
this.menu_ordre = menu_ordre;
this.menu_visible = menu_visible;
this.menu_deleted = menu_deleted;
this.menu_parent = menu_parent;
this.menu_controlleur = menu_controlleur;
this.menu_navigation = menu_navigation;
}
public Menu(Integer gmnu_code, String menu_lib, Integer menu_ordre, Integer menu_visible, Integer menu_deleted, Integer menu_parent, String menu_controlleur, String menu_navigation, Set<Role> roles) {
super();
this.gmnu_code = gmnu_code;
this.menu_lib = menu_lib;
this.menu_ordre = menu_ordre;
this.menu_visible = menu_visible;
this.menu_deleted = menu_deleted;
this.menu_parent = menu_parent;
this.menu_controlleur = menu_controlleur;
this.menu_navigation = menu_navigation;
this.roles = roles;
}
// getters and setters....
}
@Entity
@Table(name = "utilisateur")
public class Utilisateur {
@Id
@SequenceGenerator(name="s_utilisateur", sequenceName="s_utilisateur", allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="s_utilisateur")
private int user_code;
@Formula(value="user_nom || ' ' || user_prenom")
private String noms;
private String user_nom;
private String user_prenom;
private String user_login;
private String user_passwd;
private String user_email;
private Integer user_deleted;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "role_user", joinColumns = { @JoinColumn(name = "user_code") }, inverseJoinColumns = { @JoinColumn(name = "role_code") })
private Set<Role> roles = new HashSet<Role>();
public Utilisateur() {
super();
}
public Utilisateur(String user_nom, String user_prenom, String user_login, String user_passwd, String user_email, Integer user_deleted) {
super();
this.user_nom = user_nom;
this.user_prenom = user_prenom;
this.user_login = user_login;
this.user_passwd = user_passwd;
this.user_email = user_email;
this.user_deleted = user_deleted;
}
public Utilisateur(String noms, String user_nom, String user_prenom, String user_login, String user_passwd, String user_email, Integer user_deleted, Set<Role> roles) {
super();
this.noms = noms;
this.user_nom = user_nom;
this.user_prenom = user_prenom;
this.user_login = user_login;
this.user_passwd = user_passwd;
this.user_email = user_email;
this.user_deleted = user_deleted;
this.roles = roles;
}
// getters and setters...
}
@Entity
@Table(name = "role")
public class Role {
@Id
private String role_code;
private String role_lib;
@ManyToMany(mappedBy = "roles")
private Set<Menu> menus = new HashSet<Menu>();
@ManyToMany(mappedBy = "roles")
private Set<Utilisateur> users = new HashSet<Utilisateur>();
public Role() {
super();
}
public Role(String role_lib) {
super();
this.role_lib = role_lib;
}
public Role(String role_lib, Set<Menu> menus) {
super();
this.role_lib = role_lib;
this.menus = menus;
}
// getters and setters...
}
现在在我的控制我叫DAO的执行导致异常：
import java.io.IOException;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.ambre.pta.dao.MenuDAO;
import com.ambre.pta.dao.RoleDAO;
import com.ambre.pta.model.DataTablesTO;
import com.ambre.pta.model.Role;
@Controller
@RequestMapping("/adminrole")
public class AdminRole {
@Autowired
private Environment env;
@Autowired
private MenuDAO menuDao;
@Autowired
private RoleDAO roleDao;
@RequestMapping(value = "/ajaxDataTableListRoles", produces = "application/json")
@ResponseBody
public String ajaxListRole(@RequestParam int draw, @RequestParam int start, @RequestParam int length,
@RequestParam("search[value]") String search, @RequestParam("order[0][column]") int triIdx, @RequestParam("order[0][dir]") String ordreTri)
{
List<Role> rolesDataTable = roleDao.list(start, length, search, triIdx, ordreTri);
List<Role> rolesAll = roleDao.list();
DataTablesTO<Role> dt = new DataTablesTO<Role>();
dt.setData(rolesDataTable);
dt.setDraw(draw);
if (search == null || search.equals("")) {
dt.setRecordsTotal(rolesAll.size());
dt.setRecordsFiltered(rolesAll.size());
}
else {
dt.setRecordsTotal(rolesDataTable.size());
dt.setRecordsFiltered(roleDao.nbRoleTotalFiltered(search));
}
ObjectMapper mapper = new ObjectMapper();
try {
return mapper.writeValueAsString(dt);
} catch (JsonGenerationException e) {
e.printStackTrace();
return "";
} catch (JsonMappingException e) {
e.printStackTrace();
return "";
} catch (IOException e) {
e.printStackTrace();
return "";
}
}
}
编辑：
这里是异常堆栈：
org.codehaus.jackson.map.JsonMappingException: failed to lazily initialize a collection of role: com.ambre.pta.model.Role.menus, could not initialize proxy - no Session (through reference chain: com.ambre.pta.model.DataTablesTO["data"]->java.util.ArrayList[0]->com.ambre.pta.model.Role["menus"])
at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183)
at org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)
at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:158)
at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:122)
at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:71)
at org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
at org.codehaus.jackson.map.ObjectMapper._configAndWriteValue(ObjectMapper.java:2575)
at org.codehaus.jackson.map.ObjectMapper.writeValueAsString(ObjectMapper.java:2097)
at com.ambre.pta.controller.AdminRole.ajaxListRole(AdminRole.java:77)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:670)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:285)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.ambre.pta.model.Role.menus, could not initialize proxy - no Session
at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:575)
at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:214)
at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:554)
at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:142)
at org.hibernate.collection.internal.PersistentSet.iterator(PersistentSet.java:180)
at org.codehaus.jackson.map.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:45)
at org.codehaus.jackson.map.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:23)
at org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
... 49 more
那么如何解决在这种情况下延迟加载异常？
编辑：
这里是实现DAO的：
public class RoleDAOImpl implements RoleDAO {
@Autowired
private SessionFactory sessionFactory;
public RoleDAOImpl() {
super();
}
public RoleDAOImpl(SessionFactory sessionFactory) {
super();
this.sessionFactory = sessionFactory;
}
@Override
@Transactional
public List<Role> list() {
@SuppressWarnings("unchecked")
List<Role> listRole = (List<Role>) sessionFactory.getCurrentSession()
.createCriteria(Role.class)
.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY).list();
return listRole;
}
@Override
@Transactional
public List<Role> list(int start, int length, String search, int triIdx, String ordreTri) {
String hql = "select r from Role r";
if (search != null && !search.equals("")) {
hql = hql.concat(" where ");
hql = hql.concat(" lower(r.role_lib) like '%").concat(search.toLowerCase()).concat("%'");
}
if (ordreTri.equals("asc")) {
switch (triIdx) {
case 0:
hql = hql.concat(" order by r.role_lib ");
break;
default:
hql = hql.concat(" order by r.role_lib ");
break;
}
} else {
switch (triIdx) {
case 0:
hql = hql.concat(" order by r.role_lib desc");
break;
default:
hql = hql.concat(" order by r.role_lib desc");
break;
}
}
Query query = sessionFactory.getCurrentSession().createQuery(hql);
query = query.setFirstResult(start);
query = query.setMaxResults(length);
@SuppressWarnings("unchecked")
List<Role> listRole = (List<Role>) query.list();
return listRole;
}
@Override
@Transactional
public int nbRoleTotalFiltered(String search) {
String hql = "select r from Role r";
if (search != null && !search.equals("")) {
hql = hql.concat(" where ");
hql = hql.concat(" lower(r.role_lib) like '%").concat(search.toLowerCase()).concat("%'");
}
Query query = sessionFactory.getCurrentSession().createQuery(hql);
@SuppressWarnings("unchecked")
List<Role> listRole = (List<Role>) query.list();
return listRole.size();
}
@Override
@Transactional
public Role get(String role_code) {
return (Role) sessionFactory.getCurrentSession().get(Role.class, role_code);
}
@Override
@Transactional
public void saveOrUpdate(Role role) {
Session sess = sessionFactory.getCurrentSession();
sess.saveOrUpdate(role);
}
@Override
@Transactional
public void delete(String role_code) {
sessionFactory.getCurrentSession().delete((Role) sessionFactory.getCurrentSession().get(Role.class, role_code));
}
}
我更新了我的问题以包含DAO的实现代码;已经有了@Transactional注解！那为什么我的代码不工作？ – pheromix
txn边界只在DAO附近。这意味着，当您的DAO返回时，txn结束，因此相应的会话关闭。这就是为什么你不能懒后取。 –
只是“事务”的简写（对不起，虽然它是一个常见的简写形式） –