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From William Lee <wwl...@uiuc.edu>
Subject Circular reference in SOAP?
Date Mon, 20 Oct 2003 14:39:40 GMT
I'm working on a WSDL file that contains circular reference.  In particular:

For example:

Market (1) --> (1) CollectionOfSegment (1) --> (*) Segment

However, the Segment contains a reference to Market so it can refer to it.

I tried to use the WSDL2Java tool to generate the Java code.  It all seems to work.  However,
when I write a unit test that does the following for example (notes the Market contains :

    private CollectionOfSegment getSegments(Market m)
    {
        CollectionOfSegment cos = new CollectionOfSegment();
        Segment[] segs = new Segment[SEGSIZE];
        for (int i = 0; i < SEGSIZE; i++)
        {
            Segment s1 = new Segment();
            // Note here I'm setting in the reference
            s1.setMarket(m);
            s1.setName("Segment " + i);
            s1.setSettings(getTradeSettings());
            s1.setSecurities(getSecurities(s1, i));
            segs[i] = s1;
        }
        cos.setSegment(segs);
        return cos;
    }

Essentially, the Market object contains a reference to the CollectionOfSegment, then each
Segment contains a reference to same Market object.

I ended up with a stack overflow problem when I run this code with a unit test.  If I do not
have the line for s1.setMarket(m), it seems to run fine.  I'm pretty new to SOAP and this
is somewhat frustrating.  Is it actually ok to have circular reference in SOAP?  It seems
like Axis just runs in an infinite loop when this happens.  Is there any way I can resolve
this?

If you're wondering, here's the full WSDL file that I'm using.  I use the ant task to produce
the code on the server side.  BTW, there's a bug when Axis generates the namespace with "\".
 It does not pad it when WSDL2Java includes the namespace in the java code quoted with ".
 I need to fix this myself.

Oh well, this is for a class assignment and who in the world would use "\" in the namspace??

<?xml version="1.0" encoding="utf-8" ?>
<definitions targetNamespace="urn:LibraryDemo\srvcGeneral\srvcdoc" xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:ns="urn:LibraryDemo\srvcGeneral\srvcdoc">
	<types>
		<schema targetNamespace="urn:LibraryDemo\srvcGeneral\srvcdoc" elementFormDefault="qualified"
xmlns="http://www.w3.org/2001/XMLSchema" xmlns:ns="urn:LibraryDemo\srvcGeneral\srvcdoc" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
			<complexType name="CollectionOfOrder">
				<sequence>
					<element name="Order" minOccurs="0" maxOccurs="unbounded" type="ns:Order"/>
				</sequence>
			</complexType>
			<complexType name="Market">
				<sequence>
					<element name="settings" minOccurs="1" maxOccurs="1" type="ns:TradingSettings"/>
					<element name="segments" minOccurs="1" maxOccurs="1" type="ns:CollectionOfSegment"/>
				</sequence>
			</complexType>
			<complexType name="CollectionOfSegment">
				<sequence>
					<element name="Segment" minOccurs="0" maxOccurs="unbounded" type="ns:Segment"/>
				</sequence>
			</complexType>
			<complexType name="TradingSettings">
				<sequence>
					<element name="stateCycleSpec" minOccurs="0" maxOccurs="1" type="xsd:string"/>
					<element name="stopTradingRange" minOccurs="0" maxOccurs="1" type="xsd:double"/>
					<element name="priceIncrement" minOccurs="1" maxOccurs="1" type="xsd:double"/>
				</sequence>
			</complexType>
			<complexType name="Segment">
				<sequence>
					<element name="name" minOccurs="1" maxOccurs="1" type="xsd:string"/>
					<element name="settings" minOccurs="1" maxOccurs="1" type="ns:TradingSettings"/>
					<element name="securities" minOccurs="1" maxOccurs="1" type="ns:CollectionOfSecurity"/>
					<element name="market" minOccurs="1" maxOccurs="1" type="ns:Market"/>
				</sequence>
			</complexType>
			<complexType name="CollectionOfSecurity">
				<sequence>
					<element name="Security" minOccurs="0" maxOccurs="unbounded" type="ns:Security"/>
				</sequence>
			</complexType>
			<complexType name="Security">
				<sequence>
					<element name="name" minOccurs="1" maxOccurs="1" type="xsd:string"/>
		<element name="settings" minOccurs="1" maxOccurs="1" type="ns:TradingSettings"/>
					<element name="segment" minOccurs="1" maxOccurs="1" type="ns:Segment"/>
				</sequence>
			</complexType>
			<complexType name="OrderStatus">
				<sequence>
					<element name="matchingShares" minOccurs="1" maxOccurs="1" type="xsd:int"/>
					<element name="order" minOccurs="1" maxOccurs="1" type="ns:Order"/>
					<element name="matchingPrice" minOccurs="1" maxOccurs="1" type="xsd:double"/>
					<element name="identification" minOccurs="1" maxOccurs="1" type="xsd:string"/>
					<element name="matchingParty" minOccurs="1" maxOccurs="1" type="ns:Party"/>
					<element name="status" minOccurs="1" maxOccurs="1" type="xsd:string"/>
				</sequence>
			</complexType>
			<complexType name="Order">
				<sequence>
					<element name="numberOfShares" minOccurs="1" maxOccurs="1" type="xsd:int"/>
					<element name="nominalPrice" minOccurs="0" maxOccurs="1" type="xsd:double"/>
					<element name="party" minOccurs="1" maxOccurs="1" type="ns:Party"/>
					<element name="instrument" minOccurs="1" maxOccurs="1" type="xsd:string"/>
				</sequence>
			</complexType>
			<complexType name="Party">
				<sequence>
					<element name="name" minOccurs="1" maxOccurs="1" type="xsd:string"/>
					<element name="identification" minOccurs="1" maxOccurs="1" type="xsd:string"/>
				</sequence>
			</complexType>
			<element name="x_GetOutstandingOrders" type="ns:GetOutstandingOrders"/>
			<complexType name="GetOutstandingOrders">
				<sequence>
					<element name="PrderIdentification" minOccurs="1" maxOccurs="1" type="xsd:int"/>
				</sequence>
			</complexType>
			<element name="x_GetOutstandingOrdersResponse" type="ns:CollectionOfOrder"/>
			<element name="x_CreateMarket" type="ns:CreateMarket"/>
			<complexType name="CreateMarket">
				<sequence>
					<element name="Market" minOccurs="1" maxOccurs="1" type="ns:Market"/>
				</sequence>
			</complexType>
			<element name="x_CreateMarketResponse" type="xsd:boolean"/>
			<element name="x_GetOrderStatus" type="ns:GetOrderStatus"/>
			<complexType name="GetOrderStatus">
				<sequence>
					<element name="OrderIdentification" minOccurs="1" maxOccurs="1" type="xsd:int"/>
				</sequence>
			</complexType>
			<element name="x_GetOrderStatusResponse" type="ns:OrderStatus"/>
			<element name="x_AddSellOrder" type="ns:AddSellOrder"/>
			<complexType name="AddSellOrder">
				<sequence>
					<element name="Order" minOccurs="1" maxOccurs="1" type="ns:Order"/>
				</sequence>
			</complexType>
			<element name="x_AddSellOrderResponse" type="ns:OrderStatus"/>
			<element name="x_AddBuyOrder" type="ns:AddBuyOrder"/>
			<complexType name="AddBuyOrder">
				<sequence>
					<element name="Order" minOccurs="1" maxOccurs="1" type="ns:Order"/>
				</sequence>
			</complexType>
			<element name="x_AddBuyOrderResponse" type="ns:OrderStatus"/>
		</schema>
	</types>
	<message name="GetOutstandingOrders">
		<part name="parameter" element="ns:x_GetOutstandingOrders"/>
	</message>
	<message name="GetOutstandingOrdersResponse">
		<part name="return" element="ns:x_GetOutstandingOrdersResponse"/>
	</message>
	<message name="CreateMarket">
		<part name="parameter" element="ns:x_CreateMarket"/>
	</message>
	<message name="CreateMarketResponse">
		<part name="return" element="ns:x_CreateMarketResponse"/>
	</message>
	<message name="GetOrderStatus">
		<part name="parameter" element="ns:x_GetOrderStatus"/>
	</message>
	<message name="GetOrderStatusResponse">
		<part name="return" element="ns:x_GetOrderStatusResponse"/>
	</message>
	<message name="AddSellOrder">
		<part name="parameter" element="ns:x_AddSellOrder"/>
	</message>
	<message name="AddSellOrderResponse">
		<part name="return" element="ns:x_AddSellOrderResponse"/>
	</message>
	<message name="AddBuyOrder">
		<part name="parameter" element="ns:x_AddBuyOrder"/>
	</message>
	<message name="AddBuyOrderResponse">
		<part name="return" element="ns:x_AddBuyOrderResponse"/>
	</message>
	<portType name="ElectronicMarket">
		<operation name="GetOutstandingOrders">
			<documentation>It returns all the orders placed by a party that didn't match any
other.</documentation>
			<input message="ns:GetOutstandingOrders"/>
			<output message="ns:GetOutstandingOrdersResponse"/>
		</operation>
		<operation name="CreateMarket">
			<documentation>It creates a market with segments, securities and parties</documentation>
			<input message="ns:CreateMarket"/>
			<output message="ns:CreateMarketResponse"/>
		</operation>
		<operation name="GetOrderStatus">
			<documentation>It returns the status of an order posted before</documentation>
			<input message="ns:GetOrderStatus"/>
			<output message="ns:GetOrderStatusResponse"/>
		</operation>
		<operation name="AddSellOrder">
			<documentation>It adds an order for selling the instrument spedified by anOrder</documentation>
			<input message="ns:AddSellOrder"/>
			<output message="ns:AddSellOrderResponse"/>
		</operation>
		<operation name="AddBuyOrder">
			<documentation>It adds an order for buying the instrument spedified by anOrder</documentation>
			<input message="ns:AddBuyOrder"/>
			<output message="ns:AddBuyOrderResponse"/>
		</operation>
	</portType>
	<binding name="ElectronicMarket" type="ns:ElectronicMarket">
		<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http/"/>
		<operation name="GetOutstandingOrders" selector="getOutstandingOrders:">
			<soap:operation soapAction=""/>
			<input>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</input>
			<output>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</output>
		</operation>
		<operation name="CreateMarket" selector="createMarket:">
			<soap:operation soapAction=""/>
			<input>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</input>
			<output>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</output>
		</operation>
		<operation name="GetOrderStatus" selector="getOrderStatus:">
			<soap:operation soapAction=""/>
			<input>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</input>
			<output>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</output>
		</operation>
		<operation name="AddSellOrder" selector="addSellOrder:">
			<soap:operation soapAction=""/>
			<input>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</input>
			<output>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</output>
		</operation>
		<operation name="AddBuyOrder" selector="addBuyOrder:">
			<soap:operation soapAction=""/>
			<input>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</input>
			<output>
				<soap:body use="literal" namespace="urn:LibraryDemo\srvcGeneral\srvcdoc"/>
			</output>
		</operation>
	</binding>
	  <service name="ElectronicMarketService">
    <port name="ElectronicMarket" binding="ns:ElectronicMarket">
      <soap:address location="http://localhost:8080/jboss-net/services/ElectronicMarket"/>
    </port>
  </service>
</definitions>

--
William (Will) Lee 
Email: wwlee1@uiuc.edu
Computer Science, University of Illinois at Urbana-Champaign

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