xmlelement - Usando SAX con JAXBContext

xmlelement prefix java

Question

Estoy intentando deserializar datos XML en árboles de contenido de Java recién creados:

Estoy usando SAX, tengo la clase de Java en src / main / java / Summaries.java y estoy intentando simplemente imprimir el documento extraído:

String xmlPath = "C://workspace-sts-2.8.0.RELEASE//RESTClient//src//main//resources//dailySummary.xml";
String xmlPath2 = "/dailySummary.xml";
String xmlPath3 = "/src/main/resources/dailySummary.xml";
InputStream inputStream = null;
InputSource inputSource = null;
Unmarshaller unmarshaller = null;
JAXBContext jc = null;
try
{
// read from a file
// or try xmlPath1 or try xmlPath3
inputStream = RESTtestclient.class.getClassLoader().getResourceAsStream(xmlPath2);
inputSource = new InputSource(inputStream);
SAXParserFactory sax = SAXParserFactory.newInstance();
sax.setNamespaceAware(true);
XMLReader reader = sax.newSAXParser().getXMLReader();
SAXSource saxSource= new SAXSource(reader, inputSource);
// use jAXB
Class[] classes = new Class[1];
classes[0]= Summaries.class;
jc = JAXBContext.newInstance(classes);
unmarshaller = jc.createUnmarshaller();
@SuppressWarnings("unchecked")
**JAXBElement<Object> doc = (JAXBElement<Object>) unmarshaller.unmarshal(saxSource);** // errors out here
sysout(doc);
}

Me sale un error como este:

javax.xml.bind.UnmarshalException
- with linked exception:
[org.xml.sax.SAXParseException: File "null" not found.]
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:315)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.createUnmarshalException(UnmarshallerImpl.java:505)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:206)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:173)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:120)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:103)
at main.java.RESTtestclient.marshallJAXB(RESTtestclient.java:346)
at main.java.RESTtestclient.main(RESTtestclient.java:82)
Caused by: org.xml.sax.SAXParseException: File "null" not found.
at org.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1156)
at org.apache.xerces.readers.DefaultEntityHandler.startReadingFromDocument(DefaultEntityHandler.java:499)
at org.apache.xerces.framework.XMLParser.parseSomeSetup(XMLParser.java:310)
at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1034)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:200)

¿Alguna idea que pueda apuntarme en la dirección correcta?

Answer 1

Podría intentar el siguiente acercamiento usando el UnmarshallerHandler de JAXB:

package forum10890323;
import java.io.InputStream;
import javax.xml.bind.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Root.class);
UnmarshallerHandler unmarshallerHandler = jc.createUnmarshaller().getUnmarshallerHandler();
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
xr.setContentHandler(unmarshallerHandler);
InputStream inputStream = Root.class.getClassLoader().getResourceAsStream("forum10890323/input.xml");
InputSource inputSource = new InputSource(inputStream);
xr.parse(inputSource);
inputStream.close();
Root root = (Root) unmarshallerHandler.getResult();
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(root, System.out);
}
}