JPA: Store fileAttachment into the database

I would like to know if there is any way I can store a fileAttachment directly into the database with JPA.

I have an attribute:

public fileAttachement logo;

I have tried to change it to:

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public byte[] logo;

But that's not doing what I was expecting.

And a "fileAttachment" is what exactly ? class definition ? DataNucleus provides a flexible way of persisting any type as a String, so depending on your "fileAttachment" you could use that