How to create a JAXB Context from File System

[Ankur Sharma]

Hi I was writing an unmarshaller for JAXB, but for that first I need to create a JAXB Context.

Here is the sample code I am using

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import org.xml.sax.SAXException;

public class SchemaValidator {

  public boolean validateSchema(File xsdFile, File xmlFile, File destDir) {
    try {

      // JAXBContext jc = JAXBContext.newInstance("primer.po");---------[b][size=18]Check this line[/size] [/b]
      JAXBContext jc = JAXBContext
          .newInstance("C:\\Documents and Settings\\Sharma\\Desktop\\XML\\tmp\\");

      Unmarshaller u = jc.createUnmarshaller();
      SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

      // Source schemaSource = new StreamSource(new File("POSLog.xsd"));
      Source schemaSource = new StreamSource(xsdFile);

      Schema schema = schemaFactory.newSchema(schemaSource);
      u.setSchema(schema);

      // JAXBElement pos = (JAXBElement) u.unmarshal(new File("POSLog.xml"));
      JAXBElement pos = (JAXBElement) u.unmarshal(xmlFile);

      System.out.println("Done");
    } catch (SAXException e) {
      System.out.println("SAXException: Inavlid XML");
      e.printStackTrace();
    } catch (UnmarshalException unmarshalException) {
      System.out.println("UnmarshalException: Inavlid XML");
      unmarshalException.printStackTrace();
    } catch (JAXBException je) {
      System.out.println("JAXBException: Inavlid XML");
      je.printStackTrace();
    }
    return false;
  }

  public static void main(String[] args) {
    SchemaValidator validator = new SchemaValidator();
    File xsdFile = new File("C:\\Documents and Settings\\Sharma\\Desktop\\XML\\tmp\\POSLog.xsd");
    File xmlFile = new File("C:\\Documents and Settings\\Sharma\\Desktop\\XML\\tmp\\POSLog.xml");
    File destDir = new File(
        "C:\\Documents and Settings\\Sharma\\Desktop\\XML\\tmp\\validator\\temp");

    validator.validateSchema(xsdFile, xmlFile, destDir);
  }

  public static void createClassLoader() {
    ClassLoader prevCl = Thread.currentThread().getContextClassLoader();
    try {

      URL url = new URL("file", "localhost",
          "C:\\Documents and Settings\\Sharma\\Desktop\\XML\\tmp\\");

      // ClassLoader urlCl = URLClassLoader.newInstance(new URL[] { url }, prevCl);
      ClassLoader urlCl = URLClassLoader.newInstance(new URL[] { url });

      Thread.currentThread().setContextClassLoader(urlCl);

      Context ctx = new InitialContext();

      System.out.println(ctx.lookup("validator.temp.report.txt"));

    } catch (NamingException e) {
    } catch (MalformedURLException malformedURLException) {
      malformedURLException.printStackTrace();
    } finally {
      Thread.currentThread().setContextClassLoader(prevCl);
    }
  }

}

Now if I am trying to run this Main class from c:\temp\doc\testproject and my JAXB Objects are somewhere else, how can I create a JAXB Context for that packge.
If I am doing the same code at the same folder where JAXB objects are kept then it's working fine but with different folder it's not working.Please check at line 28 and 29.

Please let me know if you didn't understand the issue exactly.

Thanks
Ankur

[Bear Bibeault]

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