Export to excel Issues

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Dear Experts ,

I am trying to export a table data to excel .

I have included 3jar files :

poi-scratchpad-3.1-FINAL-20080629.jar

poi-3.1-FINAL-20080629.jar

poi-contrib-3.1-FINAL-20080629.jar

in external library dc and included it in my main dc.

Now when I deploy my dc I get the error :

java.lang.NoClassDefFoundError: org/apache/poi/hssf/usermodel/HSSFWorkbook

at com.sap.vendor.SearchVendor.Export_to_excel(SearchVendor.java:336)

at com.sap.vendor.wdp.InternalSearchVendor.Export_to_excel(InternalSearchVendor.java:327)

at com.sap.vendor.VendorDetailsView.onActionExport_Data(VendorDetailsView.java:194)

at com.sap.vendor.wdp.InternalVendorDetailsView.wdInvokeEventHandler(InternalVendorDetailsView.java:258)

at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:87)

Please help.