How to annotate non-persistence fields?

Hi,
I am using TopLink Essentials as my JPA provider. I have few objects where I don't have a mapping of fields on the object to the database columns. Basically I would like to use few fields in the object to create some behaviour and doesn't want to persist or query. By default, TopLink is reading all the fields and mapping them to the table I defined and I am getting the "Invalid Identifier" errors. Is there a way I can tell TopLink to ignore certain fields in an Entity class for the persistence. I have used the @Column annotation for all my fields that are in the DB to map. Can I use any annotations for this purpose or any other ways to achieve this? I do not want create separate subclasses just for 2 or 3 fields that I use. Your help is appreciated.

I just found out that I can use @Transient. Problem solved.

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