org.xml.sax.SAXNotSupportedException: http://apache.org/xml/features/validation/dynam

[thevoice]

Hello there,
I have java program which generates report runtime.

i got the following error,When i try to run my java program from my ruby on rails application

SEVERE: Digester.getParser:
org.xml.sax.SAXNotSupportedException: http://apache.org/xml/features/validation/dynamic
at gnu.xml.stream.SAXParserFactory.setFeature(libgcj. so.7rh)
at org.apache.commons.digester.parser.XercesParser.co nfigureXerces(XercesParser.java:185)
at org.apache.commons.digester.parser.XercesParser.ne wSAXParser(XercesParser.java:138)
at org.apache.commons.digester.ParserFeatureSetterFac tory.newSAXParser(ParserFeatureSetterFactory.java: 71)
at org.apache.commons.digester.Digester.getParser(Dig ester.java:692)
at org.apache.commons.digester.Digester.getXMLReader( Digester.java:899)
at org.apache.commons.digester.Digester.parse(Digeste r.java:1647)
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXM L(JRXmlLoader.java:239)
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXM L(JRXmlLoader.java:226)
at net.sf.jasperreports.engine.xml.JRXmlLoader.load(J RXmlLoader.java:214)
at ar.com.fdvs.dj.core.DynamicJasperHelper.generateJa sperDesign(DynamicJasperHelper.java:197)
at ar.com.fdvs.dj.core.DynamicJasperHelper.generateJa sperReport(DynamicJasperHelper.java:581)
at ar.com.fdvs.dj.core.DynamicJasperHelper.generateJR XML(DynamicJasperHelper.java:469)
at MyDynamicReport.buildJRXML(MyDynamicReport.java:94 )
at MyDynamicReport.main(MyDynamicReport.java:67)
Exception in thread "main" java.lang.NullPointerException
at org.apache.commons.digester.Digester.getXMLReader( Digester.java:899)
at org.apache.commons.digester.Digester.parse(Digeste r.java:1647)
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXM L(JRXmlLoader.java:239)
at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXM L(JRXmlLoader.java:226)
at net.sf.jasperreports.engine.xml.JRXmlLoader.load(J RXmlLoader.java:214)
at ar.com.fdvs.dj.core.DynamicJasperHelper.generateJa sperDesign(DynamicJasperHelper.java:197)
at ar.com.fdvs.dj.core.DynamicJasperHelper.generateJa sperReport(DynamicJasperHelper.java:581)
at ar.com.fdvs.dj.core.DynamicJasperHelper.generateJR XML(DynamicJasperHelper.java:469)
at MyDynamicReport.buildJRXML(MyDynamicReport.java:94 )
at MyDynamicReport.main(MyDynamicReport.java:67)

Can any body tell me what is reason for such error?
What i have to do to solve these error?

Regards,
the voice

[orchid]

My guess would be a missing jar fiile but I am not sure which one.