Hello Raphaël,
I think the problem is that you have your Biosource class abstract.
Either remove "abstract" or add @XmlTransient in it.
Cheers,
D.
Raphaël Flores wrote:
> Hi,
>
> I come back this evening with a linked problem. I resolved the above
> one by setting the class to unmarshal AND its inherited class in
> JAXBContext.newInstance() parameters like :
> JAXBContext.newInstance(clazz, subClazz);
>
> My problem now concerns the case when I use a object collection class
> (named BiosourceList) to unmarshall. Here is the BisourceList class :
> =====================
> @XmlRootElement(name="biosources")
> @XmlAccessorType(XmlAccessType.FIELD)
> public class BiosourcesList {
> @XmlElement(name = "biosource")
> private List<Biosource> biosource = new ArrayList<Biosource>();
>
> public BiosourcesList() {
> }
>
> public BiosourcesList(List<Biosource> biosources) {
> this.biosource = biosources;
> }
> // getter and setter
> // ...
> }
> =====================
>
>
> The Biosource class contains mainly:
> =====================
> @XmlRootElement(name = "biosource")
> @XmlAccessorType(XmlAccessType.FIELD)
> public abstract class Biosource extends ProticObject {
> protected String biosourceName;
> protected Date sowingDate;
> protected String remark;
> protected Long startingMaterialTermId;
> protected boolean isPrivate;
>
> public Biosource() {
> }
> // getters and setters...
> =====================
>
>
> And the ClientBiosource class is currently empty but I need to have it
> extending Biosource for other stuff:
> =====================
> @XmlRootElement(name = "biosource")
> public class ClientBiosource extends Biosource {
> public ClientBiosource() {
> }
> }
> =====================
>
>
> The ProticObject class contains few integer fields which need to be
> marshalled too, no jaxb annotation here.
> I try to unmarshal my stream as follows :
> =====================
> JAXBContext jc = JAXBContext.newInstance(collectionClazz,
> subClazz); //collectionClazz is BiosourceList.class, clazz is
> Biosource.class, and subClazz. is ClientBiosource.class
> Unmarshaller u = jc.createUnmarshaller();
>
> Object object = (Object) u.unmarshal(inputStream);
> =====================
>
>
> The exception occurs on last line at unmarshal step, it says :
> Unable to create an instance of
> main.java.fr.inra.moulon.proticport.model.entities.Biosource
>
> The XML inputStream generated by CXF with Jaxb is like this:
> =====================
> <biosources>
> <biosource>
> <dbId>123</dbId>
> <logId>1525</logId>
> <projectId>127</projectId>
> <biosourceName>MUTANTS 07</biosourceName>
> <sowingDate>1970-01-01T00:00:00+01:00</sowingDate>
> <remark>N.R. </remark>
> <isPrivate>false</isPrivate>
> </biosource>
> <biosource>
> <dbId>354</dbId>
> <logId>5424</logId>
> <projectId>127</projectId>
> <biosourceName>MUTANTS 03</biosourceName>
> <sowingDate>1970-01-01T00:00:00+01:00</sowingDate>
> <remark>N.R. </remark>
> <isPrivate>false</isPrivate>
> </biosource>
> //...
> </biosources>
> =====================
>
> I have tried to put more classes in
> JAXBContext.newInstance(classes...) for JAXB knows what to unmarshal
> with, but no way, I still get the error.
>
> Any help would be greatly appreciated.
>
> Thanks, Raphael.
>
>
>
>
>
> Raphaël F. wrote:
>> Oh sure !
>>
>> I didn't notice this problem. Now, I use the subclass with Jaxb by
>> allowing Jaxb to match subclass with Project.class.
>>
>> Thanks a lot Wolfang.
>>
>>
>> Wolfgang Laun a écrit :
>>>
>>>
>>> <quote>
>>>
>>>
>>> java.lang
>>> Class InstantiationException
>>>
>>> public class *InstantiationException*
>>> extends Exception <file:////usr/local/java/jdk1.6.0_03/docs/api/java/lang/Exception.html>
>>>
>>>
>>>
>>> Thrown when an application tries to create an instance of a class
>>> using the |newInstance| method in class |Class|, but the specified
>>> class object cannot be instantiated. The instantiation can fail for
>>> a variety of reasons including but not limited to:
>>>
>>> * the class object represents an abstract class,...
>>>
>>> </quote>
>>>
>>> Get rid of abstract in main.java.***.Project.
>>> -W
>>>
>>>
>>> 2009/9/8 Raphaël Flores <rflores_at_moulon.inra.fr
>>> <mailto:rflores_at_moulon.inra.fr>>
>>>
>>> Hello all, when I execute my app, I get an exception thrown at
>>> unmarshalling step.
>>>
>>> I don't understand why, and did not find solution via google.
>>> That's why I post here.
>>>
>>> Here is the exception:
>>> ---------------------------------------------------------------------
>>> Exception in thread "main" javax.xml.bind.UnmarshalException:
>>> Unable to create an instance of main.java.***.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.java.***.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
>>> ---------------------------------------------------------------------
>>>
>>>
>>> Here is my test code:
>>> =================================================
>>> 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 {
>>>
>>> public static void main(String[] args) throws Exception {
>>>
>>> String url = "http://localhost:8080/projects/127"
>>> <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");
>>>
>>> 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;
>>> }
>>> =================================================
>>>
>>>
>>> And here is Project class which is binding:
>>> ---------------------------------------------------------------------
>>> import javax.xml.bind.annotation.XmlRootElement;
>>>
>>> import main.java.***.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;
>>> }
>>>
>>> [ other getters/setters ... ]
>>> }
>>> ---------------------------------------------------------------------
>>>
>>>
>>> Here is the XML what is returned by server, for exemple:
>>> =================================================
>>> <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>[/CODE]
>>> =================================================
>>>
>>> Would someone have an idea on how resolve this problem please?
>>>
>>> Thanks a lot for your help.
>>>
>>>
>
> --
> Raphaël F.