Apache POI - error in reading excel file -

I am using poi-3.5-beta5 to read an Excel file.
I'm trying to open Excel file through the XSSFWorkbook workbook = New XSSFWorkbook (xlspath);

I am getting the following error (though I am not using log4j)

Exception in java.lang.NoClassDefFoundError: org / apache / Org.apache. Log4j / logger (or Java: 63) on org.apache.poi.openxml4j.opc.package on org.apss.poi.poIXMLDocument.openPackage (POIXMLDocument.java:63) at poi.xssf.usermodel .xssfworkbook. (XSSFWorkbook.java:173) test.ExcelReader.displayFromExcel (ExcelReader.java:44) test.ExcelReader.main (ExcelReader.java:138)

Please help me with this problem alone. Thank you.