NonUniqueObjectException is thrown when there is an object already associated with the session with the same id (primary key) (i.e. a duplicate). It is important to understand the concept of a “detached” object in Hibernate. This is one of the most common errors, understanding why and when this error is thrown will save you time in identifying and fixing this issue.
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LazyInitializationException is thrown when an object becomes detached, and if you try to access associated (i.e. proxied) object(s) of a detached object.
Q. What is a detached object in Hibernate?
When you close an individual Hibernate Session, the persistent objects you are working with are detached.
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#1. Enable Logging in your log4j.xml, log4j.properties, or myapp-logback.xml
In the log4j.properties file, you can enable Hibernate SQL logging as shown below
or in your log4j.xml or myapp-logback.xml as
You can then check your logs for the SQLs executed and the parameters passed.
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