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Null values on the fields

2006 IR Open Dicussion

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By: Diogo Oliveira - diogosales

Null values on the fields

2006-03-29 08:39


I'm trying to establish a connection with a custom data source I called TestSource. Nothing goes wrong in compilation but the fields appear with null values.


I've created a report test.jasper with a configured connection that I tested (and returned successful test) with a factory TestDataSourceFactory and createDatasource() as a static method that returns the data source. Then the code goes something like this:


public class TestDataSourceFactory {


public static TestDataSource createDatasource () {


return new TestDataSource();






and the corresponding datasource object:


import net.sf.jasperreports.engine.*;


public class TestDataSource implements JRDataSource {


public boolean next() {


return true;




public Object getFieldValue (JRField field) {


return field.getDescription();






those implementations may seem ridiculous and trivial but are for testing purposes only.


Now the problem is, when I compile the report and run it / view it (e.g. with JRviewer) using the active connection, both fields return null on the report.

But I have reasons to believe the problem comes before the code. When I click the Test button on the connection config dialog, it's ok (and changing the factory class name returns not ok), but compiling / executing using active connection seems to do nothing: i even tried inserting




as the first line of code in the createDatasource() method, but still nothing got printed out in the console (where I started iReport).


I double checked the field definitions (I defined a couple of fields with iReport, i think i did it right) and the active connection. its should be ok..


What am I doing wrong guys?


BTW, i tried to do things programatically, with a tiny app, with something like this in its main() method:


String file = "test.jasper";

Map prms = new HashMap();


JasperReport jr = (JasperReport)JRLoader.loadObject(file);

JasperPrint jp = JasperFillManager.fillReport(jr,prms,new TestDataSource());

JasperViewer jv = new JasperViewer (jp);


But the penultimate line returns an error I can get out of, something like this:


Exception in thread "main" java.lang.ExceptionInInitializerError

at net.sf.jasperreports.engine.fill.JRFillObjectFactory.getTextField(JRFillObjectFactory.java:514)

at net.sf.jasperreports.engine.base.JRBaseTextField.getCopy(JRBaseTextField.java:256)

at (...)


at Testes.main(Testes.java:28)

Caused by: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException

at org.apache.commons.logging.LogFactory.newFactory(LogFactory.java:558)

at org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:355)

at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:390)

at net.sf.jasperreports.engine.fill.JRFillTextElement.<clinit>(JRFillTextElement.java:61)

... 13 more

Caused by: java.lang.NullPointerException

at org.apache.commons.logging.LogFactory.newFactory(LogFactory.java:543)

... 16 more


And I believe I added all the jar files to the project (using eclipse IDE).


Any help would be so much welcome, I'm really stuck here :/


Thanks in advance guys.

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