LazyInitializationException

[mukeshguliaO]

i run my webapp and it gives this error..
it ran before. when i tried to run it again after closing the application this error starting comming. now in which direction this can be resolved!!?

ERROR [LazyInitializationException]: failed to lazily initialize a collection of role: com.db.mmrepo.common.model.magellan.UserGroup.userGroupTasks, no session or session was closed 
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.db.mmrepo.common.model.magellan.UserGroup.userGroupTasks, no session or session was closed
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
	at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:97)
	at org.hibernate.collection.PersistentSet.size(PersistentSet.java:139)
	at com.db.mmrepo.common.security.MagellanUser.lookupMagellanUser(MagellanUser.java:61)
	at com.db.mmrepo.app.magellanweb.security.UserAuthenticator.authenticateUser(UserAuthenticator.java:63)
	at com.db.mmrepo.app.magellanweb.security.RequestSecurityInterceptor.preHandle(RequestSecurityInterceptor.java:30)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:809)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:754)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:399)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:354)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at com.db.mmrepo.app.magellanweb.util.filter.HibernateSessionRequestFilter.doFilter(HibernateSessionRequestFilter.java:23)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	at java.lang.Thread.run(Thread.java:619)
[2011-04-08 17:44:29,757] ERROR [[magellanWeb]]: Servlet.service() for servlet magellanWeb threw exception 
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.db.mmrepo.common.model.magellan.UserGroup.userGroupTasks, no session or session was closed
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
	at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
	at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:97)
	at org.hibernate.collection.PersistentSet.size(PersistentSet.java:139)
	at com.db.mmrepo.common.security.MagellanUser.lookupMagellanUser(MagellanUser.java:61)
	at com.db.mmrepo.app.magellanweb.security.UserAuthenticator.authenticateUser(UserAuthenticator.java:63)
	at com.db.mmrepo.app.magellanweb.security.RequestSecurityInterceptor.preHandle(RequestSecurityInterceptor.java:30)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:809)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:754)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:399)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:354)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at com.db.mmrepo.app.magellanweb.util.filter.HibernateSessionRequestFilter.doFilter(HibernateSessionRequestFilter.java:23)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	at java.lang.Thread.run(Thread.java:619)

[dr_pompeii]

Hello

I assume you are trying to read or use the collection from your view (jsp file), this exception is classic

ERROR [LazyInitializationException]: failed to lazily initialize a collection of role: com.db.mmrepo.common.model.magellan.UserGroup.user GroupTasks

A solution available is with hibernate initialize each element of the collection of your UserGroup class and then send to the controller through a BO or service of course

Do a research about LazyInitializationException in the forum in the section DataAccess

HTH