Hi everyone
Just a second ago, I tried creating a client interface using Axis2 and the
following WSDL:
<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions name="emc-remote"
targetNamespace="http://www.example.org/emc-remote/";
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/";
xmlns:emc="http://www.example.org/emc-remote/";
xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/";>
<wsdl:types>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
targetNamespace="http://www.example.org/emc-remote/";>
<xsd:complexType name="MeterType">
<xsd:sequence>
<xsd:element name="id"
type="xsd:int" />
<xsd:element name="name"
type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Meter">
<xsd:sequence>
<xsd:element name="id"
type="xsd:int" />
<xsd:element name="name"
type="xsd:string" />
<xsd:element name="address"
type="xsd:string" />
<xsd:element name="meterType"
type="emc:MeterType" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="MeteringPoint">
<xsd:sequence>
<xsd:element name="id"
type="xsd:int" />
<xsd:element name="name"
type="xsd:string" />
<xsd:element
name="multiplicatorFactor" type="xsd:double" />
<xsd:element name="meters"
type="emc:Meter" minOccurs="0"
maxOccurs="unbounded" />
</xsd:sequence>
</xsd:complexType>
<xsd:element name="sayHelloRequest"
type="xsd:string" />
<xsd:element name="sayHelloResponse"
type="xsd:string" />
<xsd:element name="getMeteringPointsResponse">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="item"
type="emc:MeteringPoint"
minOccurs="0"
maxOccurs="unbounded" />
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
</wsdl:types>
<wsdl:message name="sayHelloRequest">
<wsdl:part name="name" element="emc:sayHelloRequest" />
</wsdl:message>
<wsdl:message name="sayHelloResponse">
<wsdl:part name="message" element="emc:sayHelloResponse" />
</wsdl:message>
<wsdl:message name="getMeteringPointsRequest" />
<wsdl:message name="getMeteringPointsResponse">
<wsdl:part name="metering_points"
element="emc:getMeteringPointsResponse" />
</wsdl:message>
<wsdl:portType name="remote">
<wsdl:operation name="sayHello">
<wsdl:input message="emc:sayHelloRequest" />
<wsdl:output message="emc:sayHelloResponse" />
</wsdl:operation>
<wsdl:operation name="getMeteringPoints">
<wsdl:input message="emc:getMeteringPointsRequest"
/>
<wsdl:output message="emc:getMeteringPointsResponse"
/>
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="remote" type="emc:remote">
<soap:binding style="document"
transport="http://schemas.xmlsoap.org/soap/http"; />
<wsdl:operation name="getMeteringPoints">
<soap:operation
soapAction="http://www.example.org/emc-remote/getMeteringPoints"; />
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
<wsdl:operation name="sayHello">
<soap:operation
soapAction="http://www.example.org/emc-remote/sayHello"; />
<wsdl:input>
<soap:body use="literal" />
</wsdl:input>
<wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="emc-remote">
<wsdl:port name="port" binding="emc:remote">
<soap:address
location="http://localhost/emc-remote.exe"; />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>
The important part represents the getMeteringPointsRequest, as it does not
take any arguments. Consequently, I would expect Axis2 to generate a class
GetMeteringPointsRequest without any constructor arguments. Unfortunately,
it turns out that Axis does not generate any such class and the stub method
does not take any parameters at all, so I can use the generated interface
like this:
EmcRemoteStub server = new EmcRemoteStub();
SayHelloRequest sayHelloRequest = new SayHelloRequest();
sayHelloRequest.setSayHelloRequest("Tom");
System.out.println(server.sayHello(sayHelloRequest).getSayHelloResponse());
System.out.println(server.getMeteringPoints()); // Very
convenient, but probably wrong...
While I would find that extraordinarily convenient, I just don't think
that's how Axis works. The following exception thrown when I try to execute
the above code assures me on this suspicion:
Hello Tom!
org.apache.axis2.AxisFault: No XML element tag
at
org.apache.axis2.util.Utils.getInboundFaultFromMessageContext(Utils.java:435
)
at
org.apache.axis2.description.OutInAxisOperationClient.handleResponse(OutInAx
isOperation.java:371)
at
org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperatio
n.java:417)
at
org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisO
peration.java:229)
at
org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
at
org.example.www.emc_remote.EmcRemoteStub.getMeteringPoints(EmcRemoteStub.jav
a:309)
at org.example.Runner.main(Runner.java:13)
My question to you would thus be: How to correctly implement a web service
without any input parameters? And, of course, how to describe such a service
in WSDL?
Thanks for any help on this issue and best regards
Pascal Kesseli
