NullPointerException at UnMarshalling time

Question

while unmarshalling with jaxb api getting this nullpointerexception,
JAXBContext jc = JAXBContext.newInstance("packagename");
Unmarshaller unmarshaller = jc.createUnmarshaller();
unmarshaller.setValidating(true);
Feature feature = (Feature) unmarshaller.unmarshal(new File("meetingPlanner.xml"));
here feature is java class generated by the binding compiler
java.lang.NullPointerException
     at com.sun.msv.verifier.regexp.REDocumentDeclaration.<init>(REDocumentDeclaration.java:39)
     at com.sun.xml.bind.validator.ValidatingUnmarshaller.create(ValidatingUnmarshaller.java:51)
     at com.sun.xml.bind.unmarshaller.UnmarshallerImpl.createUnmarshallerHandler(UnmarshallerImpl.java:95)
     at com.sun.xml.bind.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:109)
     at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:139)
     at com.ameriprise.fa.web.inter.common.utils.cms.JAXBReader.main(JAXBReader.java:51)
org.xml.sax.SAXParseException: unexpected root element feature
     at com.sun.xml.bind.unmarshaller.SAXUnmarshallerHandlerImpl.startElement(SAXUnmarshallerHandlerImpl.java:94)
     at org.apache.xerces.parsers.SAXParser.startElement(SAXParser.java:1376)
     at org.apache.xerces.validators.common.XMLValidator.callStartElement(XMLValidator.java:1284)
     at org.apache.xerces.framework.XMLDocumentScanner.scanElement(XMLDocumentScanner.java:1806)
     at org.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.dispatch(XMLDocumentScanner.java:949)
     at org.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentScanner.java:381)
     at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1098)
     at com.sun.xml.bind.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:127)
     at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:139)
     --------------- linked to ------------------
javax.xml.bind.UnmarshalException
- with linked exception:
[org.xml.sax.SAXParseException: unexpected root element feature]
     at javax.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:306)
     at com.sun.xml.bind.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:131)
     at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:139)
please help me...............
Message was edited by:
kalyan_srikar

Answer 1

The problem is in your bean (and the error is runtime, not deploy time). We can guess the problem. Change getGreeting to look like this:
public String getGreeting() {
if (name == null) return "";
if ( name.length() == 0 )
return "";
else
return "Welcome to JSF2 + Ajax, " + name + "!";
}