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java.lang.NullPointerException: 	at org.apache.commons.logging.LogFactory.newFactory(LogFactory.java:543)	at org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:355)	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:409)	at org.apache.commons.digester.Digester.(Digester.java:304)	at net.sf.jasperreports.engine.xml.JRXmlDigester.(JRXmlDigester.java:62)	at net.sf.jasperreports.engine.xml.JRXmlDigesterFactory.createDigester(JRXmlDigesterFactory.java:975)	at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:203)	at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:168)	at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:152)	at net.sf.jasperreports.engine.JasperCompileManager.compileReportToFile(JasperCompileManager.java:90)	at pdf.Application.main(Application.java:15)