Send Images using Dynamic Proxies

Question

Hi!
I try to send java.awt.Images over the wire.
My first attempt was to modify the static
stub example from the tutorial ('hello').
I added a new method to the interface
and the implementation with Image as its
return value. It worked fine.
However, then I tried to modify the dynamic
proxy example from the tutorial ('proxy').
I added the same method, but it didn't work.
My method (getImage) seems to return a
javax.activation.DataHandler object instead
of Image, because a ClassCastException occured
at runtime.
I modifed the method's return value to
Object, but still returned an Image.
The return value was indeed DataHandler.
The DataHandler's getContent method returned
the Image I sent!
Where's my mistake?
Roland Spindler

Answer 1

The WSDL is generated automatically:
<?xml version="1.0" encoding="UTF-8"?>
<definitions name="MyHello" targetNamespace="http://com.test/wsdl/MyHello" xmlns:tns="http://com.test/wsdl/MyHello" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns2="http://java.sun.com/jax-rpc-ri/internal" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/">
<types>
<schema targetNamespace="http://java.sun.com/jax-rpc-ri/internal" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="http://java.sun.com/jax-rpc-ri/internal" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:soap-enc="http://schemas.xmlsoap.org/soap/encoding/" xmlns="http://www.w3.org/2001/XMLSchema">
<import namespace="http://schemas.xmlsoap.org/soap/encoding/"/>
<simpleType name="image">
<restriction base="base64Binary"/></simpleType></schema></types>
<message name="HelloIF_sayHello">
<part name="String_1" type="xsd:string"/></message>
<message name="HelloIF_sayHelloResponse">
<part name="result" type="xsd:string"/></message>
<message name="HelloIF_getImage"/>
<message name="HelloIF_getImageResponse">
<part name="result" type="ns2:image"/></message>
<portType name="HelloIF">
<operation name="sayHello" parameterOrder="String_1">
<input message="tns:HelloIF_sayHello"/>
<output message="tns:HelloIF_sayHelloResponse"/></operation>
<operation name="getImage" parameterOrder="">
<input message="tns:HelloIF_getImage"/>
<output message="tns:HelloIF_getImageResponse"/></operation></portType>
<binding name="HelloIFBinding" type="tns:HelloIF">
<operation name="sayHello">
<input>
<soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" use="encoded" namespace="http://com.test/wsdl/MyHello"/></input>
<output>
<soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" use="encoded" namespace="http://com.test/wsdl/MyHello"/></output>
<soap:operation soapAction=""/></operation>
<operation name="getImage">
<input>
<soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" use="encoded" namespace="http://com.test/wsdl/MyHello"/></input>
<output>
<soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" use="encoded" namespace="http://com.test/wsdl/MyHello"/></output>
<soap:operation soapAction=""/></operation>
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="rpc"/></binding>
<service name="MyHello">
<port name="HelloIFPort" binding="tns:HelloIFBinding">
<soap:address location="REPLACE_WITH_ACTUAL_URL"/></port></service></definitions>