Exception in thread "main" org.hibernate.LazyInitializationException: could not initialize proxy [pojos.Category#1] - no Session code example

Example: org.hibernate.LazyInitializationException: could not initialize proxy [ua.tqs.ReCollect.model.User#2407] - no Session

@OneToMany(mappedBy="department", cascade = CascadeType.ALL, fetch=FetchType.EAGER)