org.hibernate.MappingException: Could not instantiate id generator
i’m facing following error when starting up the application with Oracle database, this happens after upgraded the spring from 2.x to 3.x, which upgraded the hibernate from 5.x to 6.x.
Hibernate: very slow query
I have a ‘for’ loop that gets some data from the database for each element in the List. And sometimes the query executes tolerably fast (0.015s), but sometimes it takes about 6 seconds, which makes me wait forever for the loop to finish (there can be several hundred elements).
Is generating Hibernate Entities from database tables considered a bad practices?
On my current project it is a common practice to generate Hibernate Entities from database tables using NetBeans functionality. I’m normally used to first write the Entity-class and define the mapping in an XML-file or with annotations.