Excel Uploader: Excel Uploader is a UI component add-on for Vaadin.
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allow extenssion *.xls or *.xlsx → List
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FieldName or Annotation Matching Excel Upload
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AbstractExcelUploader Extension
// add option
setFirstRow(2); // default : 0
setSheetAt(1); // default: 0
setSheetName(“Sheet2”); // Target sheetAt or SheetName