"LazyInitializationException: Unable to perform requested lazy initialization" when merging a detached entity in Hibernate

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP) 7
  • Hibernate 5

Issue

  • Enabling bytecode enhancement with <enableLazyInitialization>true</enableLazyInitialization>

  • Using @LazyToOne(LazyToOneOption.NO_PROXY) on a ManyToOne association

  • When merging a detached entity for which the association has not yet been initialized, encountering

    ... org.hibernate.LazyInitializationException: Unable to perform requested lazy initialization [my_entity_here] - no session and settings disallow loading outside the Session

Resolution

This issue1 is resolved in This content is not included.EAP 7.2 cumulative patch (CP) 1 and later releases. Production systems should use the latest available cumulative patch.

Root Cause

This is a known defect (Content from hibernate.atlassian.net is not included.HHH-13129).

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