if u exported a filled report into XML then again load that into JasperPring	JRPrintXmlLoader
	it is load JsperPrint file from file system to memory as JasperPrint object	JRLoader
1 st step ..Load xml file	it is used to load JRXML file into memory	JRXmlLoader
3rd step .. Compiling xml file	to compile JRXML file into Jasper Native template	JasperCompileManager
4th step.. Fill data dynamically	fill data in report	JasperFillManager
	it export Jasper Filled report to many format of file	JasperExportManager
	"it is used to send report to Brwoser. It fill the report and stream to browser.	JasperRunManager
2nd step ..Obtaining this object	in memory representation of JRXML file	JasperDesign
	in memory representation of COMPILED version of JRXML file. That is Native format	JasperReport
	it is memory rep. of a FILLED jasper report in native format	JasperPrint
	it is java utillity programe to view the filled report	JasperViewer
testing or debuging	It is java utillity programe to preview the report without compile & fill. It also can be used to preview compiled report also	JasperDesignViewer
	if u want to customised facility of JFreeChart	JRChartCustomizer
		JRParameter
	defined some constant used by exporting classes	JRExportParameter.
	used constant from this when to expoert a report as plain text	JRTextExporterParameter
		JRHtmlExporterParameter
	used when a report is very big and need to store some page in virtual memory	JRVirtulaizer
			JRFileVirtualizer

		JRExporter
			JRPdfExporter
			JRRtfExporter
			JROdtExporter
			JExcelApiExporter
			JRHtmlExporter
			JRXmlExporter
			JRCsvExporter
			JRTextExporter
	it is just repesentation of Style based template. We may not use	JRTemplate
this is for good to know the execution time of any part of report or access field, variables, parameters values	to call Java code at the time of filling report if need.	JRAbstractScriptlet
			JRDefaultScriptlet

	JRDataSource
use this when no need any dynamic data		JREmptyDataSource
always use this.		JRResultSetDataSource
		JRMapArrayDatasource
		JRMapCollectionDataSource
it is useful when we use JPA or Hibernate to retrive object list from DB		JRBeanArrayDataSource
it is useful when we use JPA or Hibernate to retrive object list from DB		JRBeanCollectionDataSource
it is used by Swing Application		JRTableModelDataSource
plain xml going be use as data soruce, at least we can use this to demo or testing		JRXmlDataSource
CSV file going to be use as data soruce, at least we can use this to demo or testing		JRCsvDataSource
it is interface to create custom Data Soruce		JRRewindableDataSource