Update Unbounded element using SOAP_CLIENT and JAXB classes

I am writing a custom worklist application using 10.1.3.3. I am able to successfully kick off my BPEL process from my Java application and I am even able to modify most of the fields defined in my XSD. My problem occurs when I try to update the unbounded elements. They are of complex type and each request can have an unlimited number of these elements.
I used JDeveloper's tool to generate the JAXB classes I'm using to interact and modify the payload of my task. I know that JAXB does not generate setter methods for unbounded elements. I should be able to get the list of elements and simply add to it. Unfortunately, the new list elements are not being saved when I marshall my payload and update the task with the new payload.
Any ideas on what I'm doing wrong or if there is another way to do this? I've posted code snippets below.
Thanks!
Quote Element from XSD:
<xsd:element name="Quote" nillable="true" minOccurs="0" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="WorksheetId" type="xsd:int" minOccurs="0"/>
<xsd:element name="QuoteId" type="xsd:int" minOccurs="0"/>
<xsd:element name="Description" nillable="true" minOccurs="0">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:maxLength value="250"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="Quantity" type="xsd:int" nillable="true" minOccurs="0"/>
<xsd:element name="UnitPrice" type="xsd:float" nillable="true" minOccurs="0"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
AddQuote java code:
JAXBContext jc = JAXBContext.newInstance("myproject.xml");
Unmarshaller u = jc.createUnmarshaller();
Task detailTask = wfSvcClient.getTaskQueryService().getTaskDetailsById(ctx, thisId);
Element detailPayload = detailTask.getPayloadAsElement();
ObjectFactory objFactory = new ObjectFactory();
XMLWorksheet xRequest = objFactory.createWorksheet();
xRequest = (XMLWorksheet)u.unmarshal(detailPayload.getFirstChild());
List quotes = xRequest.getQuote();
quotes.add(quote);
Marshaller m = jc.createMarshaller();
m.marshal(xRequest, detailPayload);
detailTask.setPayloadAsElement(detailPayload);
taskService.updateTask(ctx, detailTask);

who actually managed to make the SOAP_CLIENT working ?
What is the jar list and order you use ?
Does it work with java 5 ?
Thanks for the help!

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