Web Service - Cannot Deploy on Local OC4J

Question

We get the following error when trying to deploy the following code as a web service to the local OC4J.
The parameter of domDoc of type oracle.xml.parser.v2.XMLDocument cannot be serialized into XML, and no custom serializer has been defined for it.
All we want to do with this service is connect to the database and return the results of the query in XML. We have tried a string, but it returns a string of XML and we need it to return the XML.
The code compiles, runs, and looks as though it is returning what it is suppose to if we write the return out, but the code will not deploy as a web service.
Thanx so much
Pam
This is the code:
package getuserform;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import oracle.xml.parser.v2.XMLDocument;
import oracle.xml.sql.query.OracleXMLQuery;
public class getUserInfo {
public int GetUserInfo(XMLDocument domDoc){
try {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
} catch (SQLException e) {
// TODO
return(-1);
String url = "jdbc:oracle:thin:@db:1521:v9it";
Connection myCon;
try {
myCon = DriverManager.getConnection(url,"user","password");
} catch (SQLException e) {
// TODO
return(-1);
OracleXMLQuery qry = new OracleXMLQuery (myCon,
"select upper(t.u_name_frst) || ' ' || upper(t.u_name_last) U_Name," +
" t.user_id, " +
" t.active Active, " +
" to_char(t.termination_dt, 'DD-MON-YYYY') Termination_DT, " +
" '(' || t.area_code || ') ' || t.phone_no Phone, " +
" t.email Email, " +
" t.city City, " +
" (select dpl_desc from schema.dept_pay_locations dpl where dpl.dpl_num = t.pay_location) Pay_Location, " +
" t.LOCATION Location " +
" from schema.users t " +
" where upper(t.user_id) like upper ('u227%')");
// xmlStr = qry.getXMLString(); works.
// return (qry.getXMLString()); works
// !work
domDoc = (XMLDocument)qry.getXMLDOM();
qry.close();
return(0);
}

Answer 1

Hi Pam,
It is using Element as the method return that is causing the problem. As you've seen this means that the Data Control has no concrete schema types to associate with the fields so it fails.
I have a couple of possible workarounds.
1. Is it a requirement to write your SQL query in the method? Perhaps they are to be dynamic?
If not, have you considered using the database to do the query and publishing that as the service. This would work around the problem. You can use JDeveloper to do all of this if you 'wrap' the query in a PL/SQL package in the database. Then use the 'Web Service from PL/SQL Package' wizard to generate the web service including wrapper Java classes for the package and DB connection/mgmt classes.
Or you can publish the actual Query as a service - using the command line (unfortunately you can't use JDEV to do this)
2. You mentioned the XSD for the query - if you have that then you can use a custom serializer and map your XSD to the return type of your method - the org.w3c.dom.Element class:
a. if your web service is already generated - open properties (Web Services Editor)
b. go to Custom Mappings page
c. click Add
d. for Java Class type in org.w3c.dom.Element
e. for XML Qualified Name add your XSD
f. add your serializer class - here is one I made earlier!
package project3;
import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.soap.SOAPElement;
import javax.xml.soap.SOAPException;
import oracle.webservices.SOAPUtil;
import oracle.webservices.databinding.SOAPElementSerializer;
import org.w3c.dom.Element;
public class DummyElementSerialiser implements SOAPElementSerializer
public void init(Map map)
public SOAPElement serialize(QName qName, Object object)
try
return SOAPUtil.toSOAPElement((Element) object);
catch (SOAPException ex)
return null;
if you're generating the service from scratch this same mapping page comes up as part of the wizard
Now you should be able to create your data control
rgds
Susan