Nulls are not properly serialized within arrays
-----------------------------------------------
Key: AXIS-2524
URL: http://issues.apache.org/jira/browse/AXIS-2524
Project: Apache Axis
Issue Type: Bug
Components: Serialization/Deserialization
Affects Versions: 1.4
Environment: Windows XP SP2, JDK 1.5.0_06
Reporter: Brian Fitzpatrick
I'm working with a complexType that contains various arrays. It appears that
Axis 1.4 is not properly handling null items that occur within the array.
Instead of using the nillable="true/false" setting on the <element> that
defines the Array, it is determining whether to send xsi:nil based on whether
the complexType that contains the arrays, can be omitted (minOccurs=0). So, it
doesn't seem to matter the settings on the <element> tag of the arrays, only
whether the enclosing complexType can be omitted.
This causes several problems, especially with .NET interoperability:
- (Axis client to .NET server) .NET will define the parameters of a service
method as omittable (minOccurs=0), so an Axis client will never send xsi:nil to
the .NET server, which throws off the size of the array, since the null array
item is just omitted.
- (.NET client to .NET server) When the same service is used from a .NET
client, it will correctly use the nillable="true/false" setting of the array to
determine whether to send xsi:nil or omit the array item. So a single
complexType could have multiple arrays, in which some of them are allowed to be
null and others are not
- (Axis client to Axis server) Axis will define the parameters of a service
method as required (minOccurs=1), so an Axis client will ALWAYS send xsi:nil
when an array item is null. It does not look at the <element> declaration for
that array to determine if it should be sending xsi:nil or omitting the item,
based on the nillable="true/false" setting. So an Axis client will sometimes be
sending xsi:nil when it should not be.
>From my interpretation, it should be looking at the nillable="true/false"
>setting on the <element> tag that defines the array to determine whether to
>send the xsi:nil or not.
Detailed info:
I created a very simple .NET web service that defined a complexType named
"TestObject". TestObject contains one string array call StringItems, which is
set for nillable="true". The WSDL snippets that follow were generated by .NET.
<s:complexType name="TestObject">
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="StringItems"
type="tns:ArrayOfString" />
</s:sequence>
</s:complexType>
<s:complexType name="ArrayOfString">
<s:sequence>
<s:element minOccurs="0" maxOccurs="unbounded" name="string"
nillable="true" type="s:string" />
</s:sequence>
</s:complexType>
I created one method to send and receive this type:
<s:element name="SendObjectWithArray">
<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="test"
type="tns:TestObject" />
</s:sequence>
</s:complexType>
</s:element>
I created an Axis client and a .NET client to call this service. I called the
service with the following array:
obj.StringItems = new string[] { "first", "second", null, "fourth (after
null)", "fifth" };
The axis client omitted the null parameter in the request. However, when a
null was sent back from the server, it correctly preserved it in the return
array.
The .NET client sent xsi:nil for the null parameter and correctly preserved the
return xsi:nil as a null in the return array.
The full WSDL:
<?xml version="1.0" encoding="utf-8"?>
<wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/";
xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/";
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/";
xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/"; xmlns:tns="urn:test"
xmlns:s="http://www.w3.org/2001/XMLSchema";
xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/";
xmlns:http="http://schemas.xmlsoap.org/wsdl/http/"; targetNamespace="urn:test"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/";>
<wsdl:types>
<s:schema elementFormDefault="qualified" targetNamespace="urn:test">
<s:element name="SendObjectWithArray">
<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="test"
type="tns:TestObject" />
</s:sequence>
</s:complexType>
</s:element>
<s:complexType name="TestObject">
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="StringItems"
type="tns:ArrayOfString" />
</s:sequence>
</s:complexType>
<s:complexType name="ArrayOfString">
<s:sequence>
<s:element minOccurs="0" maxOccurs="unbounded" name="string"
nillable="true" type="s:string" />
</s:sequence>
</s:complexType>
<s:element name="SendObjectWithArrayResponse">
<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1"
name="SendObjectWithArrayResult" type="tns:TestObject" />
</s:sequence>
</s:complexType>
</s:element>
</s:schema>
</wsdl:types>
<wsdl:message name="SendObjectWithArraySoapIn">
<wsdl:part name="parameters" element="tns:SendObjectWithArray" />
</wsdl:message>
<wsdl:message name="SendObjectWithArraySoapOut">
<wsdl:part name="parameters" element="tns:SendObjectWithArrayResponse" />
</wsdl:message>
<wsdl:portType name="ArrayTestSoap">
<wsdl:operation name="SendObjectWithArray">
<wsdl:input message="tns:SendObjectWithArraySoapIn" />
<wsdl:output message="tns:SendObjectWithArraySoapOut" />
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="ArrayTestSoap" type="tns:ArrayTestSoap">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http"; />
<wsdl:operation name="SendObjectWithArray">
<soap:operation soapAction="urn:test/SendObjectWithArray"
style="document" />
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:binding name="ArrayTestSoap12" type="tns:ArrayTestSoap">
<soap12:binding transport="http://schemas.xmlsoap.org/soap/http"; />
<wsdl:operation name="SendObjectWithArray">
<soap12:operation soapAction="urn:test/SendObjectWithArray"
style="document" />
<wsdl:input>
<soap12:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap12:body use="literal" />
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="ArrayTest">
<wsdl:port name="ArrayTestSoap" binding="tns:ArrayTestSoap">
<soap:address location="http://localhost:1792/arraytest/ArrayTest.asmx"; />
</wsdl:port>
<wsdl:port name="ArrayTestSoap12" binding="tns:ArrayTestSoap12">
<soap12:address location="http://localhost:1792/arraytest/ArrayTest.asmx";
/>
</wsdl:port>
</wsdl:service>
</wsdl:definitions>
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