> I'm trying to use the @Externalizer annotation but have problems > with the resulting type of the DB-field - it's always a byte-array.
You shouldn't need the @Type annotation -- the type will be inferred from the return type of the externalizer method. Are you dropping the database table in between attempts? It's possible that if your first attempt resulted in a byte array column because of some misconfiguration, OpenJPA will think it is supposed to reuse that column on subsequent mapping attempts, because technically it can fit anything in a byte-array column. Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.