java.lang.reflect.InvocationTargetException: null

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java.lang.NullPointerException: null
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:162)
at org.jxls.transform.poi.PoiTransformer.createTransformer(PoiTransformer.java:47)
at org.jxls.transform.poi.PoiTransformer.createTransformer(PoiTransformer.java:40)
at com.sri.xlsreport.Demo1.main(Demo1.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.jxls.util.TransformerFactory.createTransformer(TransformerFactory.java:35)
at org.jxls.util.JxlsHelper.createTransformer(JxlsHelper.java:187)
at org.jxls.util.JxlsHelper.processTemplate(JxlsHelper.java:88)
at com.sri.xlsreport.Demo1.ObjectCollectionDemo(Demo1.java:49)
at com.sri.xlsreport.Demo1.main(Demo1.java:37)

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