javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:""). Expected elements are

Below is some information that should help:

XML

Below is a portion of your XML. One thing to note is the xmlns attribute. This is a special attribute and refers to namespace qualification within the XML document.

<lookupInstances xmlns='http://www.pqr.com/awd/rest/v1' name='LKIMGR'>    <lookupParameters/></lookupInstances>

Below is another version of the XML with the same namespace qualification:

<abc:lookupInstances xmlns:abc='http://www.pqr.com/awd/rest/v1' name='LKIMGR'>    <abc:lookupParameters/></abc:lookupInstances>

When you remove the xmlns attribute the namespace qualification is removed. The document below is not equivalent to the two above.

<lookupInstances name='LKIMGR'>    <lookupParameters/></lookupInstances>

Your Error

javax.xml.bind.UnmarshalException: unexpected element (uri:"http://www.pqr.com/awd/rest/v1", local:"lookupInstances"). Expected elements are <{}lookupInstances>

This error indicates that you have not mapped the namespace qualification correctly.

Mapping the Namesapce Qualification in JAXB

Namespace qualification in JAXB is done using the package level @XmlSchema annotation. Package level annotations go in package-info.java. Below is the complete source for this class. If you already have a package-info.java source file ensure it is being compiled and packaged with the rest of your classes.

@XmlSchema(     namespace = "http://www.pqr.com/awd/rest/v1",     elementFormDefault = XmlNsForm.QUALIFIED) package your_package;import javax.xml.bind.annotation.XmlNsForm;import javax.xml.bind.annotation.XmlSchema;

XML Schema

If you are generating your model from an XML Schema make sure this namespace qualification is properly define there. It will look like:

<?xml version="1.0" encoding="UTF-8"?><xs:schema     xmlns:xs="http://www.w3.org/2001/XMLSchema"     targetNamespace="http://www.pqr.com/awd/rest/v1"     xmlns="http://www.pqr.com/awd/rest/v1"     elementFormDefault="qualified"></xs:schema>

Change

@XmlRootElement(name = "lookupInstances")

to

@XmlRootElement( namespace = "http://www.pqr.com/awd/rest/v1", name = "lookupInstances")

It seems that the class created by JAXB does not contain the namespace information:

@XmlType(name = "", propOrder = {    "lookupParameters"})

I suspect that it causes this error, simply because it expects no namespace:

javax.xml.bind.UnmarshalException: unexpected element (uri:"http://www.pqr.com/awd/rest/v1", local:"lookupInstances"). Expected elements are <{}lookupInstances>

I am not sure why the generated class lacks this information, but I would start with adding it manually to verify that this is the problem:

@XmlType(name = "", namespace= "http://www.pqr.com/awd/rest/v1", propOrder = {    "lookupParameters"})