Polymorphic object returned from POJO service method is serialized in reverse
order than what is expected by client generated with wsdl2java (when subclass
contains an array).
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Key: AXIS2-3956
URL: https://issues.apache.org/jira/browse/AXIS2-3956
Project: Axis 2.0 (Axis2)
Issue Type: Bug
Affects Versions: 1.2, 1.4
Environment: Windows XP, Tomcat 5.0.28, Axis2 1.4, also Axis2 1.2.
Reporter: David R. Kraus
Serialization code provided on the server side by Axis2, based on my POJO and
its supporting parameter/return objects, serializes a returned polymorphic
object with subclass fields first, followed by superclass fields, when the
subclass contains an array.
The client code generated from the WSDL of this POJO based service (using
wsdl2java-ADB), serializes the polymorphic object in the reverse order with
superclass fields preceding subclass fields; and also expects that polymorphic
objects received from the server follow this same order. Since the server
serializes in the reverse order "unexpected subelement" errors occur.
My assertion is that client serialization code, which is generated from POJO
WSDL using wsdl2java, should be consistent with POJO server serialization code.
More info below:
I deployed a simple web service as a POJO to both axis2 1.2 and axis2 1.4. This
service basically echoes back an object which demonstrates inheritance. In this
example, MWSAttributeObjectInfo is a subclass of MWSObjectInfo. To create the
client I used wsdl2java (adb) against the deployed POJO service WSDL.
When I invoked the echoAttrObjInfo method, which simply passes in
MWSAttributeObjectInfo, and receives the same MWSAttributeObjectInfo back, I
received an "Unexpected subelement arrayAttributeForms" in Axis2 1.2, and
"Unexpected subelement objCreationTime" in Axis2 1.4.
The client serialized the object to the server with MWSObjectInfo (superclass)
fields first, followed by subclass fields (rest of MWSAttributeObjectInfo - the
array). The server responded by passing back the object with the subclass
fields first (the array), followed by superclass fields (MWSObjectInfo). This
caused an exception in the client. Axis2 1.2 detected that the array shouldn't
come first. Axis2 1.4 didn't see the error until after the array was processed,
getting an exception on the first field after the array(objCreationTime).
I tried a subclass with simple fields (no array), and no error was generated.
>From the WSDL:
superclass:
<xs:element name="MWSObjectInfo" type="ax22:MWSObjectInfo" />
<xs:complexType name="MWSObjectInfo">
<xs:sequence>
<xs:element name="objCreationTime" nillable="true" type="xs:string" />
<xs:element name="objDescription" nillable="true" type="xs:string" />
<xs:element name="objID" nillable="true" type="xs:string" />
<xs:element name="objIsHidden" type="xs:boolean" />
<xs:element name="objModificationTime" nillable="true" type="xs:string" />
<xs:element name="objName" nillable="true" type="xs:string" />
<xs:element name="objOwner" nillable="true" type="xs:string" />
<xs:element name="objParentFolderID" nillable="true" type="xs:string" />
<xs:element name="objPath" nillable="true" type="xs:string" />
<xs:element name="objState" type="xs:int" />
<xs:element name="objType" type="xs:int" />
<xs:element name="objVersion" type="xs:int" />
</xs:sequence>
</xs:complexType>
subclass:
<xs:element name="MWSAttributeObjectInfo" type="ax22:MWSAttributeObjectInfo" />
<xs:complexType name="MWSAttributeObjectInfo">
<xs:complexContent>
<xs:extension base="ax22:MWSObjectInfo">
<xs:sequence>
<xs:element maxOccurs="unbounded" name="arrayAttributeForms" nillable="true"
type="ax22:MWSHierarchyAttributeFormInfo" />
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
Soap Trace
Client Request sends MWSAttributeObjectInfo(array in subclass serialized at the
end)..
<?xml version='1.0' encoding='UTF-8'?><soapenv:Envelope
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";><soapenv:Body><ns2:echoAttrObjInfo
xmlns:ns2="http://microstrategy.com/webservices/";>
<ns2:obj xmlns:s13="http://wsftest.com/xsd";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:type="s13:MWSAttributeObjectInfo">
<s13:objCreationTime>now</s13:objCreationTime>
<s13:objDescription>generic test object</s13:objDescription>
<s13:objID>DAVEKRAUS0002</s13:objID>
<s13:objIsHidden>false</s13:objIsHidden>
<s13:objModificationTime>later</s13:objModificationTime>
<s13:objName>MWSAttributeObjectInfo</s13:objName>
<s13:objOwner>Dave</s13:objOwner>
<s13:objParentFolderID>FOLDERID</s13:objParentFolderID>
<s13:objPath>objPath</s13:objPath>
<s13:objState>1</s13:objState>
<s13:objType>2</s13:objType>
<s13:objVersion>1</s13:objVersion>
<s13:arrayAttributeForms>
<s13:attributeFormID>XXXXXXXXXX</s13:attributeFormID>
<s13:attributeFormName>XXXXXXXXXX</s13:attributeFormName>
<s13:dataType>100</s13:dataType>
</s13:arrayAttributeForms>
<s13:arrayAttributeForms>
<s13:attributeFormID>YYYYYYYYYY</s13:attributeFormID>
<s13:attributeFormName>YYYYYYYYYY</s13:attributeFormName>
<s13:dataType>200</s13:dataType>
</s13:arrayAttributeForms>
</ns2:obj>
</ns2:echoAttrObjInfo></soapenv:Body></soapenv:Envelope>
Server Response echoes back same MWSAttributeObjectInfo object (array in
subclass serialized first)
<?xml version='1.0' encoding='UTF-8'?><soapenv:Envelope
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";><soapenv:Body>
<ns:echoAttrObjInfoResponse xmlns:ns="http://microstrategy.com/webservices/";>
<ns:return>
<arrayAttributeForms xmlns="http://wsftest.com/xsd";>
<attributeFormID>XXXXXXXXXX</attributeFormID>
<attributeFormName>XXXXXXXXXX</attributeFormName>
<dataType>100</dataType>
</arrayAttributeForms>
<arrayAttributeForms xmlns="http://wsftest.com/xsd";>
<attributeFormID>YYYYYYYYYY</attributeFormID>
<attributeFormName>YYYYYYYYYY</attributeFormName>
<dataType>200</dataType>
</arrayAttributeForms>
<objCreationTime xmlns="http://wsftest.com/xsd";>now</objCreationTime>
<objDescription xmlns="http://wsftest.com/xsd";>generic test
object</objDescription>
<objID xmlns="http://wsftest.com/xsd";>DAVEKRAUS0002</objID>
<objIsHidden xmlns="http://wsftest.com/xsd";>false</objIsHidden>
<objModificationTime xmlns="http://wsftest.com/xsd";>later</objModificationTime>
<objName xmlns="http://wsftest.com/xsd";>MWSAttributeObjectInfo</objName>
<objOwner xmlns="http://wsftest.com/xsd";>Dave</objOwner>
<objParentFolderID xmlns="http://wsftest.com/xsd";>FOLDERID</objParentFolderID>
<objPath xmlns="http://wsftest.com/xsd";>objPath</objPath>
<objState xmlns="http://wsftest.com/xsd";>1</objState>
<objType xmlns="http://wsftest.com/xsd";>2</objType>
<objVersion xmlns="http://wsftest.com/xsd";>1</objVersion>
</ns:return>
</ns:echoAttrObjInfoResponse>
</soapenv:Body></soapenv:Envelope>
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