Discussion :

[raf64flo]

Bonjour, lorsque j'exécute mon code de test, j'ai une exception qui est lancée lors de l'étape de unmarshal par JAXB.

Je n'arrive pas à trouver la solution du problème et Google n'est pas très bavard à ce sujet, c'est pourquoi je requiert votre expertise.

Voici le code d'erreur :

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Exception in thread "main" javax.xml.bind.UnmarshalException: Unable to create an instance of main.**.Project
 - with linked exception:
[java.lang.InstantiationException]
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.createInstance(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StructureLoader.startElement(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(Unknown Source)
        at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
        at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(Unknown Source)
        at main.java.***.Client.unmarshalNonGeneric(Client.java:401)
        at main.java.***.Client.doSomething(Client.java:349)
        at main.***.Client.main(Client.java:66)
Caused by: java.lang.InstantiationException
        at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
        at com.sun.xml.internal.bind.v2.ClassFactory.create0(Unknown Source)
        at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.createInstance(Unknown Source)
        ... 25 more

Voici comment je fais le test :

Code :

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import java.io.IOException;
import java.io.InputStream;
import java.net.ConnectException;
 
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
 
import main.java.**.Project;
 
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.cxf.common.util.Base64Utility;
 
public class Client {
 
	// private Client() {
	// }
 
	public static void main(String[] args) throws Exception {
 
		String url = "http://localhost:8080/projects/127";
		String login = "toto";
		String password = "tata";
 
		doSomething(url, login, password);
	}
 
	public static void doSomething(String url, String login, String password ) throws InterruptedException, HttpException, IOException, JAXBException{
		GetMethod get = new GetMethod(url);		
		get.addRequestHeader("Accept", "application/xml");		
		get.addRequestHeader("ContentType", "application/xml");
 
		// Je construit le header HTTP Authorization
		get.addRequestHeader("Authorization", getHeaderAuthorization(login, password));
 
		HttpClient httpclient = new HttpClient();
		try {
			int result = httpclient.executeMethod(get);
 
			System.out.println("\nResponse status code:\n" + result);
			InputStream stream = get.getResponseBodyAsStream();
 
			Project project = (Project)unmarshal(Project.class, stream);
			System.out.println("Project is:" + project.toString());
		}
		catch (ConnectException e) {
			System.out.println("\nConnection to service refused !\n"
					+ "Please, check that server is running and URL and port are right.");
		}
		finally {
			get.releaseConnection();
		}
	}
 
	public String getHeaderAuthorization(String login, String password) {
		String loginPassword = login + ":" + password;
		String encodedLoginPassword = Base64Utility.encode(loginPassword.getBytes());
		String encodedHeader = "Basic " + encodedLoginPassword;
		return encodedHeader;
	}
 
	public static <T> T unmarshal(Class<T> docClass, InputStream inputStream) throws JAXBException {
		System.out.println("Class is: " + docClass);
		JAXBContext jc = JAXBContext.newInstance(docClass);
		Unmarshaller u = jc.createUnmarshaller();
		T object = (T) u.unmarshal(inputStream);
		return (T) object;
	}

Et voici la classe Project en question :

Code :

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import javax.xml.bind.annotation.XmlRootElement;
 
import main.***.ProticObject;
 
@XmlRootElement(name = "project")
public abstract class Project extends ProticObject {
 
	protected String	projectName;
	protected String	projectDescription;
	protected String	remark;
	protected boolean	isPrivate;
 
	public Project() {
	}
 
	public int getProjectId() {
		return projectId;
	}
 
	public void setProjectId(int projectId) {
		this.projectId = projectId;
	}
 
	public String getProjectName() {
		return projectName;
	}
 
	public void setProjectName(String projectName) {
		this.projectName = projectName;
	}
 
	public String getProjectDescription() {
		return projectDescription;
	}
 
	public void setProjectDescription(String projectDescription) {
		this.projectDescription = projectDescription;
	}
 
	public String getRemark() {
		return remark;
	}
 
	public void setRemark(String remark) {
		this.remark = remark;
	}
 
	public boolean isPrivate() {
		return isPrivate;
	}
 
	public void setPrivate(boolean isPrivate) {
		this.isPrivate = isPrivate;
	}
 
}

Le XML qui est renvoyé par le serveur est correct, c'est par exemple :

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	<project>
		<dbId>127</dbId>
		<logId>0</logId>
		<projectId>127</projectId>
		<private>false</private>
		<projectDescription>
			Here is the description of the project...
		</projectDescription>
		<projectName>ARABIDOPSIS</projectName>
		<remark>
			Abstract:
			Here is the abstract...
		</remark>
	</project>

Quelqu'un aurait-il une idée de comment régler le problème ?

Merci de votre aide.