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Author

JasperReport problem

Bojan Ivkovic
Greenhorn

Joined: May 17, 2009
Posts: 7
Hi,

Can anybody help me?

when i try to run my jasper report from java code, I get this message: java.lang.NullPointerException

My code is:

public class ReportO1 {
public static Connection connectDB() {
Connection jdbcConnection = null;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
jdbcConnection = DriverManager
.getConnection("jdbcdbc:baza","Administrator","SuperAdmin");
} catch (Exception ex) {
String connectMsg = "Could not connect to the database: "
+ ex.getMessage() + " " + ex.getLocalizedMessage();
System.out.println(connectMsg);
}
return jdbcConnection;
}

public static void runReport(String datum) {
Map model = new HashMap();
model.put("datum", datum);
try {JasperReport jasperReport = (JasperReport) JRLoader.loadObject("report01.jasper");
System.out.println(2);
Connection jdbcConnection = connectDB();
System.out.println(3);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, model, jdbcConnection);
System.out.println(4);
JasperViewer.viewReport(jasperPrint, false);
} catch (Exception ex) {
System.out.print(ex);
}
}
}
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41137
    
  45
In which line does that happen? Which object is null?


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Bojan Ivkovic
Greenhorn

Joined: May 17, 2009
Posts: 7
In this line
JasperReport jasperReport = (JasperReport) JRLoader.loadObject("report01.jasper");
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41137
    
  45
Post the complete stack trace. Since no object of your code can be null in that line, it must be something within Jasper. Are you sure Jasper knows where to find "report01.jasper"?
Bojan Ivkovic
Greenhorn

Joined: May 17, 2009
Posts: 7
When I put JasperReport jasperReport = (JasperReport) JRLoader.loadObject("c:\\report01.jasper");

there is same exception.

When i put

JasperDesign jasperDesign = JRXmlLoader
.load(new File("report01.jrxml"));
JasperReport jasperReport = JasperCompileManager
.compileReport(jasperDesign);
Connection jdbcConnection = connectDB();
JasperPrint jasperPrint = JasperFillManager.fillReport(
jasperReport, model, jdbcConnection);
JasperViewer.viewReport(jasperPrint, false);

it works.


I don't want to compile report, just to execute jasper file.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41137
    
  45
Ulf Dittmer wrote:Post the complete stack trace.
Bojan Ivkovic
Greenhorn

Joined: May 17, 2009
Posts: 7
Sorry i didn't understand you, what is complete stack trace?
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41137
    
  45
Instead of
} catch (Exception ex) {
System.out.print(ex);
}

use
} catch (Exception ex) {
ex.printStackTrace();
}

and post the complete output it prints.
Bojan Ivkovic
Greenhorn

Joined: May 17, 2009
Posts: 7
java.lang.NullPointerException
at net.sf.jasperreports.engine.JRPropertiesMap.readObject(JRPropertiesMap.java:185)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readArray(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:192)
at net.sf.jasperreports.engine.JasperManager.loadReport(JasperManager.java:998)
at ReportO1.runReport(ReportO1.java:69)
at FormaZakazivanje.stampajIzvestaj(FormaZakazivanje.java:556)
at FormaZakazivanje.access$7(FormaZakazivanje.java:553)
at FormaZakazivanje$7.actionPerformed(FormaZakazivanje.java:331)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$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.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)
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: JasperReport problem
 
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