A detached state object can be made persist by reattaching to a session. Configuration; public class Hibernate Update Example Output : Exception in thread "main" org.hibernate.
In various places in Confluence, we work around this with manual session and transaction management to limit the amount of memory needed for bulk operations.
In order to ensure you don't retain objects in the Hibernate session, you need to: import hibernate. Session Factory Utils; import org.springframework.transaction. Platform Transaction Manager; import org.springframework.transaction. Transaction Definition; import org.springframework.transaction. Transaction Status; import org.springframework.transaction.interceptor. Default Transaction Attribute; import org.springframework.transaction.support. Transaction Callback; import org.springframework.transaction.support. Transaction Template; public class My Action list in the session doesn't maintain a reference to any persistent objects.
When we call update() method on session, if that session doesn’t contains same object (provided in update()) in cache then update() method successfully executed and the object been converted detached state to persistent state. If we call merge() method, then it verifies whether the same object is existed in the cache or not. Example : package com.onlinetutorialspoint.service; import com.
Recommended : Object States in Hibernate When we call update() method, if already a session cache containing the same object then the update() method throws an exception called Non Unique Object Exception. If the object is existed in the cache then changes are copied in to the cache.
To reattach we can use update() or merge() methods. Student#111] On the above example student2 object with Id ‘111’ is already available in session2, if we try to update with the old object (student object) then update() will throw Non Unique Object Exception.