Steve's Blog Technical Information on Oracle Middleware.

JDev 11g offers a simple way to export an ADF table to excel in a couple simple steps.

1. Create af:panelCollection on the jspx page.
2. Drag a data control onto af:panelCollection and drop it as table.
3. Set af:table id to table.
4. Expand Panel Collection facets, and drop af:toolbar on toolbar facet.
5. Drop af:commandButton on af:toolbar. Set the text to "Export To Excel"
6. Drop af:exportCollectionActionListener on af:commandButton. And set the following:

ExportId: table
Type: excelHTML
Filename: Emp.xls
Title: Employees.

The exportId needs to bind to the af:table id. Which we set as 'table' in step 3

7. Run the jspx page and test the export button.


This is how the my final code looks like:

<panelCollection>
  <facet name="menus"/>
  <facet name="toolbar">
    <toolbar>
      <commandButton text="Export To Excel">
        <exportCollectionActionListener exportedId="table" type="excelHTML"
                                        filename="Emp.xls" title="Employees"/>
      </commandButton>
    </toolbar>
  </facet>
  <facet name="statusbar"/>
  <table value="#{bindings.EmpView1.collectionModel}" var="row"
         rows="#{bindings.EmpView1.rangeSize}"
         emptyText="#{bindings.EmpView1.viewable ? 'No rows yet.' : 'Access Denied.'}"
         fetchSize="#{bindings.EmpView1.rangeSize}" filterVisible="false"
         id="table">
    <column sortProperty="Empno" sortable="false"
            headerText="#{bindings.EmpView1.hints.Empno.label}"
            filterable="false">
      <outputText value="#{row.Empno}">
        <convertNumber groupingUsed="false"
                       pattern="#{bindings.EmpView1.hints.Empno.format}"/>
      </outputText>
    </column>
    ...
    ...
    ...
  </table>
</panelCollection>

With Jdev 11g, after generating a Web Service from a java class, the WSDL contains the following 
parameter names:

...
<xsd:complexType name="sayHello">
  <xsd:sequence>
     <xsd:element name="arg0" type="xsd:string"/>
     <xsd:element name="arg1" type="xsd:string"/>
  </xsd:sequence>
</xsd:complexType>
...

My java code function looks like:
...
public String sayHello(String firstname, String lastname) {
  return "Hello " + firstname + " " + lastname;
}
...

With Jdev 10g , the same code generates the appropriate values:
...
<xsd:complexType name="sayHello">
  <xsd:sequence>
     <xsd:element name="firstname" type="xsd:string"/>
     <xsd:element name="lastname" type="xsd:string"/>
  </xsd:sequence>
</xsd:complexType>
...

To workaround this in 11g, I need to create my java class as follows:

package project1;

import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;

@WebService
public class Class1 {
    @WebMethod
    public String sayHello(@WebParam(name = "fname") String firstname,
                           @WebParam(name = "lname") String lastname) {
        return "Hello " + firstname + " " + lastname;
    }
}

And now my generated WSDL looks like:
...
<xsd:complexType name="sayHello">
  <xsd:sequence>
     <xsd:element name="fname" type="xsd:string"/>
     <xsd:element name="lname" type="xsd:string"/>
  </xsd:sequence>
</xsd:complexType>
...

http://java.sun.com/javaee/5/docs/api/javax/jws/WebParam.html