Unable to instantiate an object of XSSFWorkbook in Java servlet -

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i'm trying work xssfworkbook in web application. ran sample application xssfworkbook plain java program (with public static void main(string args[])) - runs fine - excel sheet generated.

however, when run same piece of code in java based web application - instance of xssfworkbook not instantiated. no exception thrown either!

please help!

the below code works fine me  public void trackeruploadlistener(fileuploadevent event) throws exception {     uploadedfile tracker = event.getuploadedfile();     xssfworkbook wb = null;     inputstream stream = tracker.getinputstream();     wb = new xssfworkbook(stream);   } here, listener called xhtml page.

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