ClassCastException due to "javassist" proxy in Hibernate

Solution Verified - Updated -


  • An entity is fetched as part of a LAZY association
  • When downcasting the entity to the appropriate subclass (e.g. casting Task to SubTask), the following exception is raised:

    java.lang.ClassCastException: Cannot cast support.hibernate.entity.Task_$$_jvstb10_1 to support.hibernate.entity.SubTask


  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7
    • 6
    • 5
  • Red Hat JBoss Fuse 6
  • Hibernate
    • 4
    • 3

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