Hibernate - Issue saving generic object to database

Question

I have below method to save an object to database using Hibernate but I keep getting "org.hibernate.MappingException: Unknown entity: java.lang.Class" error while saving.

System.out.println("transientInstance:" + transientInstance);
System.out.println("transientInstance:" + transientInstance.getClass());  
getSession().save(transientInstance);  

System.out.println statements are printing below information.
transientInstance:class com.mypkg.pojo.Details
transientInstance:class java.lang.Class

Any idea what could be wrong please?

Thanks,

Can you incldue the com.mypkg.pojo.Details class - especially any association to other classes. — gkamal
– gkamal, Commented May 20, 2012 at 17:03

JB Nizet · Accepted Answer · 2012-05-20 17:27:56Z

3

You're trying to store a java.lang.Class object, rather than an entity instance. transientInstance is not an entity instance. It's com.mypkg.pojo.Details.class.

The error is in code that you don't show, before the call to save().

answered May 20, 2012 at 17:27

JB Nizet

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2 Comments

user1406436 Over a year ago

Sorry but I didn't get what it means the "error is before the call to save()". Any idea on how I can fix this?

JB Nizet Over a year ago

It makes no sense to call getSession().save(Details.class). Find where Details.class is passed as argument to this method, and fix the bug by passing the object rather than its class.

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