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i use jdev905
Does #2 go away if you change to running using Hotspot? You can change which JVM is run for Embedded OC4J from the Runner settings of project properties (choose "client").
With regard to #1, I think you might have to manually set the columns attribute. But #2 is the correct approach anyhow.
Also: Have you tried using the new ADF data binding functionality (which replaces the bc4j: UIX tags) in 10g? Information on this is available at http://otn.oracle.com/products/jdev/collateral/prodtour10g.html.