How to troubleshoot "No Session found for current thread" exception on a JSP?

[laredotornado]

Hi,

I'm using Spring 3.1.0.RELEASE, Spring's transaction manager, and Hibernate 4.0.1.Final. Through Hibernate, I'm retrieving a bean, whose property I want to display on a JSP page. But when I try and display the property on the JSP page, I get the baffling exception ...

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'user' on field 'userEventFeeds': rejected value [1]; codes [methodInvocation.user.userEventFeeds,methodInvocation.userEventFeeds,methodInvocation.java.util.Set,methodInvocation]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [user.userEventFeeds,userEventFeeds]; arguments []; default message [userEventFeeds]]; default message [Property 'userEventFeeds' threw exception; nested exception is org.hibernate.HibernateException: No Session found for current thread]
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
	org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
	org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
	org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
	org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
	org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
	org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)

It looks like all the data isn't being loaded when I first load the bean. How can I force everything to be eagerly loaded? Here's the part of the JSP where I try and access the property ...

	<form:form method="Post" action="eventfeeds.jsp" commandName="user">
	number of event feeds: ${fn:length(user.userEventFeeds)}

Here's the relevant part of the domain object ...

@Entity
@Table(name = "USERS")
public class Registration implements UserDetails, Serializable {
	...
	@OneToMany(fetch = FetchType.EAGER, targetEntity = EventFeed.class)
    @JoinTable(name = "USER_EVENT_FEEDS", joinColumns = { @JoinColumn(name = "USER_ID") }, inverseJoinColumns = { @JoinColumn(name = "EVENT_FEED_ID") })
	private Set<EventFeed> userEventFeeds = new HashSet<EventFeed>(0);

Here's the controller where I load in the object ...

@Controller
@RequestMapping("/eventfeeds.jsp")
public class UserEventFeedsController {
	...
	@ModelAttribute("user")
	public UserDetails getUser(final Principal principal) {
		final String username = principal.getName().toLowerCase();
		final Registration foundUser = userService.findUserByUsername(username);
		return (UserDetails) foundUser;
	}	// getUser

Here's the service ...

@Transactional(readOnly = true, rollbackFor = Exception.class)
@Service("userService")
public class UserServiceImpl implements UserService {
	...
	@Override
	public Registration findUserById(Integer id) {
		final Registration searchUser = new Registration();
		if (id != null) { 
			searchUser.setId(id);
		}	// if
		return usersDao.getUser(searchUser);
	}

and here's the DAO ...

@Repository("usersDao")
public class UsersDaoImpl implements UsersDao {
	
	@Autowired
	private SessionFactory sessionFactory;

	...
	@Override
	public Registration getUser(final Registration user) { 
		final Session session = sessionFactory.getCurrentSession();
		Registration foundUser = null;
		
		final Criteria crit = session.createCriteria(Registration.class);
		final String username = user.getUsername();
		if (username != null) { 
			final String formattedUsername = username.trim().toLowerCase();
			crit.add(Restrictions.eq("username", formattedUsername));
		}	// if
		final Integer id = user.getId();
		if (id != null) { 
			crit.add(Restrictions.eq("id", user.getId()));
		}	// if
		final List results = crit.list();
		if (results != null && results.size() > 0) { 
			foundUser = (Registration) results.get(0);	
		}	// if
		
		return foundUser;
	}	// getUser

Here's how I configure the application context ...

	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    	<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    	<property name="url" value="jdbc:mysql://localhost:3306/myproj"/>
    	<property name="username" value="myproj"/>
    	<property name="password" value="password"/>
    	<property name="maxActive" value="10"/> 
    	<property name="minIdle" value="5"/> 
    	<!-- SELECT 1 is a simple query that returns 1 row in MySQL -->
    	<property name="validationQuery" value="SELECT 1"/> 
	</bean>

	<bean class="org.springframework.orm.hibernate4.LocalSessionFactoryBean" id="sessionFactory">
		<property name="dataSource" ref="dataSource" />
		<property name="annotatedClasses">
			<list>
				<value>com.myco.myproj.domain.Registration</value>
				<value>com.myco.myproj.domain.Role</value>
				<value>com.myco.myproj.domain.EventFeed</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="show_sql">true</prop>
				<prop key="dialect">org.hibernate.dialect.MySQLDialect</prop>
			</props>
		</property>
	</bean>

	<bean id="transactionManager"
		class="org.springframework.orm.hibernate4.HibernateTransactionManager"
		p:sessionFactory-ref="sessionFactory" />

	<tx:annotation-driven />

Any ideas how to attack this problem? - Dave

[venosov]

Hi, see this post, may be useful.