org.hibernate.LazyInitializationException: could not initialize proxy - no Session

[fstamine]

Hi guys i'm having a weird problem in here, i'm using JPA, Hibernate and Spring MVC
well in the controller class all the methods work great when i test them in the web browser EXCEPT the :
public String getModuleFormation(long id) method that returns one object and it gives me the following error :

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

as a root cause, but yesterday i tried it worked without problem in the localhost:45045/GestionModules/detail/xx URL
using the EL.
please what would cause this problem in my code (i know it's something about lazy loading i read a lot about it but i need to change the whole code if i want it to work again and what's the solution that i can only add to the function, thanks

detail.jsp :

	<c:if test="${!empty detailModule}">
	
	${detailModule.idModule}
	${detailModule.libModule}
	</c:if>

POJO Class + JPA :

    @Entity
    @Table(name="ModuleFormation")
    public class ModuleFormation {
	
	private long idModule;
	private String libModule;
	
	public ModuleFormation() {
		// TODO Auto-generated constructor stub
	}
	
	public ModuleFormation(String libModule) {
		this.libModule = libModule;
	}
	
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO, generator = "seqModule")
	@SequenceGenerator(name="seqModule", sequenceName = "seqModuleFormation")
	@Column(name="idModule")
	public long getIdModule() {
		return this.idModule;
	}
	
	public void setIdModule(long idModule) {
		this.idModule = idModule;
	}
	
	@Column(name="libModule", nullable=false, length = 100)
	public String getLibModule() {
		return this.libModule;
	}
	
	public void setLibModule(String libModule) {
		this.libModule = libModule;
	}
	
    }

DAO Class :

    @Repository
    public class ModuleFormationDAOImpl implements ModuleFormationDAO {

	@Autowired
	private SessionFactory sessionFactory;
	
	
	public void ajouterModuleFormation(ModuleFormation module) {
		sessionFactory.getCurrentSession().save(module);
	}

	public void supprimerModuleFormation(long idModule) {
		ModuleFormation module = (ModuleFormation) sessionFactory.getCurrentSession().load(ModuleFormation.class, idModule);
		if(module != null)
			sessionFactory.getCurrentSession().delete(module);
	}
	
	public List<ModuleFormation> listModuleFormation() {
		
		return sessionFactory.getCurrentSession().createQuery("from ModuleFormation")
				.list();
		
	}
	
	public ModuleFormation getModuleFormation(long idModule) {
		 return (ModuleFormation) sessionFactory.getCurrentSession().load(ModuleFormation.class, idModule);
	}

	public void majModuleFormation(ModuleFormation module) {
		sessionFactory.getCurrentSession().merge(module);
	}
	
    }

Service Class :

    @Service
    public class ModuleFormationServiceImpl implements ModuleFormationService {

	@Autowired
	private ModuleFormationDAO moduleDao;
	
	@Transactional
	public void ajouterModuleFormation(ModuleFormation module) {
		moduleDao.ajouterModuleFormation(module);
	}
	
	@Transactional
	public void supprimerModuleFormation(long idModule) {
		moduleDao.supprimerModuleFormation(idModule);
	}
	
	@Transactional
	public List<ModuleFormation> listModuleFormation() {
		return moduleDao.listModuleFormation();
	}
	
	@Transactional
	public ModuleFormation getModuleFormation(long idModule) {
		return moduleDao.getModuleFormation(idModule);
	}
	
	@Transactional
	public void majModuleFormation(ModuleFormation module) {
		moduleDao.majModuleFormation(module);
	}
    }

Controller Class :

    @Controller
    public class ModuleFormationController {
	
	@Autowired
	private ModuleFormationService moduleService;
	
	@RequestMapping("/module")
	public String listModulesFormations(Map<String, Object> map) {
		
		map.put("module", new ModuleFormation());
		map.put("moduleList", moduleService.listModuleFormation());
		
		return "module";
	}
	
	@RequestMapping(value = "/ajouter", method = RequestMethod.POST )
	public String ajouterModuleFormation(@ModelAttribute("module")
	ModuleFormation module,BindingResult result) {
		
		moduleService.ajouterModuleFormation(module);
		
		return "redirect:/module";
	}
	
	
	@RequestMapping(value = "/supprimer/{idModule}")
	public String supprimerModuleFormation(@PathVariable("idModule")
	long idModule) {
		moduleService.supprimerModuleFormation(idModule);
		
		return "redirect:/module";
	}
	

	@RequestMapping(value= "/detail/{idModule}")
	public String getModuleFormation(@PathVariable("idModule")
	long idModule,Map<String, Object> map) {
		map.put("detailModule", moduleService.getModuleFormation(idModule));
		return "/detail";
	}
	
		
	@RequestMapping(value= "/detail/modifier", method = RequestMethod.POST )
	public String majModuleFormation(@ModelAttribute("detailModule")
	ModuleFormation module, BindingResult result) {
		moduleService.majModuleFormation(module);
		return "detail/{idModule}";
	}

    }

[bytor99999]

With just what you posted, I don't see any associations to be lazy loaded. If you query for one object type then all the simple properties of that object will have data. Those top level objects won't be proxied and lazy loaded. Only associated objects would. So I think there is something missing that you didn't post. What does your entire jsp page look like? Also you should post your entire stacktrace. Which object is actually throwing the LazyInitializationException.

Thanks

Mark

[fstamine]

With just what you posted, I don't see any associations to be lazy loaded. If you query for one object type then all the simple properties of that object will have data. Those top level objects won't be proxied and lazy loaded. Only associated objects would. So I think there is something missing that you didn't post. What does your entire jsp page look like? Also you should post your entire stacktrace. Which object is actually throwing the LazyInitializationException.

Thanks

Mark

thanks Mark !
i found the solution on http://stackoverflow.com/questions/1...alize-proxy-no