spring - Getting LazyInitializationException within in a @Transactional method -

i’m getting exception when access method controller:

{"status":"failure","exception":"lazyinitializationexception","exceptionmessage":"failed lazily initialize collection of role: org.mainco.subco.lessonplan.domain.lessonplan.classrooms, not initialize proxy - no session","errormessage":"failed lazily initialize collection of role: org.mainco.subco.lessonplan.domain.lessonplan.classrooms, not initialize proxy - no session"}

controller:

@autowired private thirdpartyservice m_thirdpartysvc;  …  @requestmapping(value = "/launch", method = requestmethod.get) @transactional public string launchlti(final @requestparam string assignmentid,                         final model model,                         final httpservletrequest request,                         final httpservletresponse response,                         final principal principal) throws invalidkeyexception, unsupportedencodingexception, nosuchalgorithmexception {     final subcoauthenticationuser auth = (subcoauthenticationuser) ((authentication) principal).getprincipal();     string nextpage = null;     final user user = m_usersvc.findbyid(auth.getid());      // provision assignment in thirdparty if not done     final assignment assmt = m_lessonplandao.getassignment(assignmentid);     if (!assmt.issenttothirdparty())     {         m_thirdpartysvc.sendassignment(assignmentid);     }   // if 

is @transactional annotation unnecessary? since have on @service class…

@service @transactional public class thirdpartyserviceimpl implements thirdpartyservice {      @override     public void sendassignment(final string assignmentid)     {         final assignment assignment = m_lessonplandao.getassignment(assignmentid);         if (isthirdpartyassignment(assignment))         {             final string thirdpartypromptid = assignment.gettocitem().getthirdpartypromptid();             // gather teacher id             final lessonplan lessonplan = m_lessonplandao.getlessonplan(assignment.getlessonplan().getid());             final string teacherid = lessonplan.getownerid();             // gather students have been assigned assignment             final list<classroom> classes = lessonplan.getclassrooms();             // send 1 request each class assignment             (final classroom classroom : classes)             { 

the error occurs on for (final classroom classroom : classes) line. have @transactional everywhere, yet i’m getting lazyinitializationexception. why? , how create transaction can run method?

i’m using spring 3.2.11.release, hibernate 4.3.6.final, , jpa 2.1 on jboss 7.1.3.final. if upgrading of these solve problem, let me know.

the @tranactional boundary being respected application during runtime. can find out calling: transactionsynchronizationmanager#isactualtransactionactive()

add code print out value of above method. if false, maybe need make sure component scan isn't set right.

example: <context:component-scan base-package="com.application.dao" />

this totally miss classes in com.application.service package.