LazyInitializationException: Unable to perform requested lazy initialization ... no session and settings disallow loading outside the Session in Hibernate

Solution Verified - Updated -

Issue

  • When accessing a (@OneToMany annotated) lazy association (from an Employee entity to a list of Task entities) an exception is raised

    ... org.hibernate.LazyInitializationException: Unable to perform requested lazy initialization [support.hibernate.entity.Employee.tasks] - no session and settings disallow loading outside the Session
    at org.hibernate.bytecode.enhance.spi.interceptor.Helper.throwLazyInitializationException(Helper.java:165)
    at org.hibernate.bytecode.enhance.spi.interceptor.Helper.performWork(Helper.java:60)
    at org.hibernate.bytecode.enhance.spi.interceptor.LazyAttributeLoadingInterceptor.loadAttribute(LazyAttributeLoadingInterceptor.java:76)
    at org.hibernate.bytecode.enhance.spi.interceptor.LazyAttributeLoadingInterceptor.fetchAttribute(LazyAttributeLoadingInterceptor.java:72)
    at org.hibernate.bytecode.enhance.spi.interceptor.LazyAttributeLoadingInterceptor.intercept(LazyAttributeLoadingInterceptor.java:61)
    at org.hibernate.bytecode.enhance.spi.interceptor.LazyAttributeLoadingInterceptor.readObject(LazyAttributeLoadingInterceptor.java:296)
    at support.hibernate.entity.Employee.$$_hibernate_read_tasks(Employee.java)
    at support.hibernate.entity.Employee.getTasks(Employee.java:49)
    ...

Environment

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

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