The Stock class is used to represent a snapshot of a company's stock in the database.
Add appropriate annotations to the class, so that Hibernate maps it in the following way:
- The id field should be the primary key, which should be generated when the object is saved.
- The companyName field should be mapped to the "company_name" column in the database.
- The price field should be mapped to the "price" column in the database, it should never be null.
- The id field is correctly mapped: org.hibernate.MappingException
- The companyName field is correctly mapped: org.hibernate.MappingException
- The price field is correctly mapped: org.hibernate.MappingException
- The id field is auto generated and is the id of the entity: org.hibernate.MappingException
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