Q:

problem unmarshalling xml doc to Java objects (jaxb)

I've used xjc to create java objects from XSD.
and now I am trying to unmarshal the xml doc to the java objects but I get:
javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"GlobalComponentInformation
Any here here?
EDIT:
I am passing a org.w3c.dom.Document object, it returned from a web service call (axis web service)...
Note, the Document object returned from ws to be parsed here contains the following root element:
<GlobalInformationResponseDocument xmlns="" />

@XmlRootElement class looks like:
XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "wsExternalResponse"
})
@XmlRootElement(name = "GlobalInformationResponseDocument")
public class GlobalInformationResponseDocument {

    @XmlElement(name = "WS_ExternalResponse", required = true)
    protected WSExternalResponseType wsExternalResponse;

    /**
     * Gets the value of the wsExternalResponse property.
     * 
     * @return
     *     possible object is
     *     {@link WSExternalResponseType }
     *     
     */
    public WSExternalResponseType getWSExternalResponse() {
        return wsExternalResponse;
    }

    /**
     * Sets the value of the wsExternalResponse property.
     * 
     * @param value
     *     allowed object is
     *     {@link WSExternalResponseType }
     *     
     */
    public void setWSExternalResponse(WSExternalResponseType value) {
        this.wsExternalResponse = value;
    }

}

package-info:
@javax.xml.bind.annotation.XmlSchema(namespace = "http://www.mycompany.com/GlobalInformationResponseExt", 
        elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package com.company.jaxb.client;

A:

The root element you are receiving from the web service class:
<GlobalInformationResponseDocument xmlns="" />

Does not match the expected root element that is expected based on your JAXB mappings:
<GlobalInformationResponseDocument xmlns="http://www.mycompany.com/GlobalInformationResponseExt" />

The package-info class specifies that all elements should be namespace qualified (javax.xml.bind.annotation.XmlNsForm.QUALIFIED), and that the default namespace is 
"http://www.mycompany.com/GlobalInformationResponseExt"
@javax.xml.bind.annotation.XmlSchema(namespace = "http://www.mycompany.com/GlobalInformationResponseExt", 
        elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package com.company.jaxb.client;

You will either need to fix the XML document, or change the JAXB mappings to match the documnent.  In this case by removing package-info.

