ho risolto in parte il mio problema, ora riesco ad esportare in html ed a visualizzare l'anteprima. però mi restituisce errore sull'istruzione di esportazione in pdf

qui di seguito il codice



public static void runReport(String databaseName, String userName, String password,String reportFile) {
try{

Connection jdbcConnection = connectDB(databaseName, userName, password);
Map<String,String> parameters = new HashMap<String, String>();
parameters.put("nome_parametro","");


JasperPrint jasperPrint = JasperFillManager.fillReport("stampa//report1.jasper", parameters, jdbcConnection);
JasperExportManager.exportReportToHtmlFile(jasperP rint, "report1.html");
JasperExportManager.exportReportToPdfFile(jasperPr int, "report1");
JasperViewer.viewReport(jasperPrint);
}catch(Exception ex) {
String connectMsg = "Could not create the report " + ex.getMessage() + " " + ex.getLocalizedMessage();
System.out.println(connectMsg);
}
}



questo è l'errore

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/lowagie/text/DocumentException
at net.sf.jasperreports.engine.JasperExportManager.ex portReportToPdfFile(JasperExportManager.java:121)
at interfacce.stampa.runReport(stampa.java:80)
at interfacce.stampa.report(stampa.java:102)
at interfacce.pannellologin$1.actionPerformed(pannell ologin.java:129)
at javax.swing.AbstractButton.fireActionPerformed(Unk nown Source)
at javax.swing.AbstractButton$Handler.actionPerformed (Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed (Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent( Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(U nknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unkno wn Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.lowagie.text.DocumentException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 29 more

ogni aiuto è ben accetto!