Error
org.hibernate.LazyInitializationException: failed to lazily initialize
while using Hibernate and loading the Enitity.
Error Type
Runtime
Cause
Hibernate has the feature to lazily initialize dependencies , relationship and associations from the Database. Any related references marked as @OneToMany or @ManyToMany are loaded lazily i.e when they are accessed and not when the parent is loaded. Seems like the session is closed before any reference to the dependent object is made.
Resolution 1
Set lazy=false in the hibernate config file.
Resolution 2
Set
@Basic(fetch=FetchType.EAGER) at the mapping or
@[ManyToOne,OneToMany](fetch = FetchType.EAGER)
Resolution 3
Make sure that we are accessing the dependent objects before closing the session.
Resolution4
Add a trick to keep the session open or manage the session in a way to close the session upon completion of request. Filter can be added to better handle the session.