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It's been a very long time since I used POI. If I get a chance later I shall give it a go.

Could you attach an Office 2007 Excel file to this thread please which I can use for testing?

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Search for "XSSF and SAX (Event API)" on The New Halloween Document

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Have a look at Apache POI - Java API To Access Microsoft Format Files

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Wll I've never used the excel API you are using so I would have no clue why you are seeing that exception, have you tried this with a pre 2007 excel file which is not XML?

See if that works and if...