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I would check the tests in github, here. That said I would say you should look into optimized (big)tiff support. Check these slides which are made for GeoServer but still usable for your case I believe. http://goo.gl/74XUPq Simone.
Usually you would ask the features to give you their schema using: SimpleFeatureType schema = collection.getSchema(); You can then use that to generate the Oracle schema to write the data into.
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