0 Replies Latest reply on Mar 11, 2014 10:24 AM by John Franey

    Hibernate: Can an EAGER collection ever contain proxies?

    John Franey Novice

      We have:


      public class Project {
           // Task is an abstract superclass, with multiple subclasses.
           private Set<Task> tasks;
           // Milestone is a subclass of Task
           public Milestone getMilestone() {
                for(Task task: getTasks()) {
                     if(task.getType() == MILESTONE) {
                          return (Milestone)task;
                return null;


      With eager load, we expect the return of getTasks() (line 9) to be a collection with non-proxy Tasks.  However, the cast fails sometimes, not every time.  The task (line 11) is a proxy, according to the stack trace.


      We have looked at the sql that hibernate uses to drive a query.  We see it joining the Project and Task tables.  So, this verifies the eager fetch occurs.  Would hibernate ALWAYS populate the tasks collection with the fetched data?  Under what condition would the entries in tasks remain proxies?