Date conversation error during jaxb marshall on a

问题:

I stuck on this Date conversation error for quite some time ... I am using eclipselinks, openJPA under TomcatEE environment, and trying to use jaxb doing marshalling. I met a problem for marshall one JPA object, which contains Date, TimeStamp elements. The exception message is ---

javax.xml.bind.MarshalException - with linked exception: [Exception [EclipseLink-3002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.ConversionException Exception Description: The object [3/19/12 12:00 AM], of class [class org.apache.openjpa.util.java$util$Date$proxy], from mapping [org.eclipse.persistence.oxm.mappings.XMLDirectMapping[createTs-->createTs/text()]] with descriptor [XMLDescriptor(xxx.xxxx.xxx.xxxx.entities.ApplicationEntity --> [])], could not be converted to [class java.util.Date].]

The strange thing is jaxb converting works OK for some customers, but not some other customer. I tried to put @XmlElement(type=Date.class) for this field crtTs, It doesn't work.

Thanks for your help in advance.

LL

回答1:

I have been able to reproduce the issue you are seeing. You can use the following bug to track our progress on this issue:

• http://bugs.eclipse.org/383639

---

WORK AROUND

DateAdapter

You could use an XmlAdapter to convert the problematic date into a proper java.util.Date.

package forum11145711;

import java.util.Date;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class DateAdapter extends XmlAdapter<Date, Date>{

    @Override
    public Date unmarshal(Date date) throws Exception {
        return date;
    }

    @Override
    public Date marshal(Date date) throws Exception {
        if(null == date) {
            return date;
        }
        return new Date(date.getTime());
    }

}

Root

The @XmlJavaTypeAdapter annotation is used to leverage the XmlAdapter:

package forum11145711;

import java.util.Date;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

@XmlRootElement
public class Root {

    private Date date;

    @XmlJavaTypeAdapter(DateAdapter.class)
    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

}

MyDate

Below is the subclass of java.util.Date I'm using in this example.

package forum11145711;

import java.util.Date;

public class MyDate extends Date {

}

Demo

Below is some demo code you can use to prove that everything works:

package forum11145711;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Root.class);

        Root root = new Root();
        root.setDate(new MyDate());

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(root, System.out);
    }

}

Output

<?xml version="1.0" encoding="UTF-8"?>
<root>
   <date>2012-06-27T10:39:49.081</date>
</root>