Actually new to java, Spanish-speaking, so I do my best to make you understand me :). I created a program that manages a mysql database to store clients, customer information, etc. And generates (or tries ...) reports. I installed JasperReports from the Eclipse market (BTW using Eclipse Kepler). Following some tutorials, I made a way to create a report on the parameters. Its only parameter for identifying one customer. It's not a problem. The problem occurs when I click the button to create a report that contains the following code:
JButton btnOk = new JButton("OK"); btnOk.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String doc = jftxtDni.getText(); String sql; boolean respuesta = false; ConexionBaseDatos cc = new ConexionBaseDatos(); sql = "SELECT * FROM clientes WHERE DNI = '"+doc+"'"; rs = cc.Consultar(sql); try { while (rs.next()) { respuesta = true; } } catch (SQLException e) { JOptionPane.showMessageDialog(null, "error sql: "+e.getMessage()); } if (respuesta) { ConexionBaseDatos cd = new ConexionBaseDatos(); Connection cn = cd.Conectar(); JasperReport jr = null; String archivo = "src/reportes/Tree.jasper"; try { HashMap<String, Object> parametro = new HashMap<String, Object>(); parametro.put("dni", doc); jr = (JasperReport) JRLoader.loadObjectFromFile(archivo); JasperPrint jp = JasperFillManager.fillReport(jr,parametro,cn); JasperViewer jv = new JasperViewer(jp); jv.setVisible(true); jv.setTitle("Informe de cliente"); } catch (JRException e) { JOptionPane.showMessageDialog(null, "error Jasper: "+e.getMessage());; } } else { JOptionPane.showMessageDialog(null, "No existe el cliente en la base de datos, verifique."); } } } )
which, despite the Spanish variable names, captures the variable entered by the user, connects to the database, checks for the existence of such a user through its "dni", if it exists, generates a report, otherwise, a message error. When I executed it for the first time, apache.commons.logging was not found, I decided to import the apache commons libraries. But after that, the mistake was what I called this topic. I said: light cake, uploaded apache commons collections, imported cans ... and that’s it! I thought ... but no way ... I get:
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/commons/collections/ReferenceMap at net.sf.jasperreports.extensions.DefaultExtensionsRegistry.<init>(DefaultExtensionsRegistry.java:97) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at net.sf.jasperreports.engine.util.ClassUtils.instantiateClass(ClassUtils.java:59) at net.sf.jasperreports.extensions.ExtensionsEnvironment.createDefaultRegistry(ExtensionsEnvironment.java:82) at net.sf.jasperreports.extensions.ExtensionsEnvironment.<clinit>(ExtensionsEnvironment.java:69) at net.sf.jasperreports.engine.util.JRStyledTextParser.<clinit>(JRStyledTextParser.java:83) at net.sf.jasperreports.engine.fill.JRBaseFiller.<init>(JRBaseFiller.java:123) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:88) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:103) at net.sf.jasperreports.engine.fill.JRVerticalFiller.<init>(JRVerticalFiller.java:61) at net.sf.jasperreports.engine.fill.JRFiller.createFiller(JRFiller.java:179) at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:81) at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:446) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:849) at formularios.ImprimirCliente$2.actionPerformed(ImprimirCliente.java:143) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(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(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown 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.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$200(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(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: org.apache.commons.collections.ReferenceMap at java.net.URLClassLoader$1.run(Unknown Source) 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) ... 55 more
... sooooo ... I double-checked the library in order and it is there, but for some reason it looks like eclipse or java, or some alien does not find it. In any case, I was researching all over the Internet, and found this error, which was mainly solved by importing collections of collections ... not in my case. Eclipse kepler, java 7 and apache 4.0. Any vague idea ..? Thank you very much for taking the time to read it, sorry for my English and waiting for some light ..: D
java eclipse classnotfoundexception
neopablo2000
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