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Hi
Ales,
well,
of course, one cannot instantiate an abstract class. But it doesn't matter
if the base class is abstract or not. It comes to the same.
Well,
almost.
My
method in the service:
Message[] getMessages()
{
return {new DefaultMessage(), new
DefaultMessage()};
}
You
will use it with something like Message[] mes = getMessages() and expect
instances of DefaultMessage.
If the
base class is abstract, you will get an array of null members (because the stub
cannot create the base class).
If it
is not, then your array members will be instances of Message, althought the
service returned instances of DefaultMessages.
The
SOAPMonitor shows that service sends the message as expected (instance of
DefaultMessage, with its members).
That's
because the stub doesn't know that there's supposed to be an inheriting class
(see my description below).
It would work, if DefaultMessage did not contain any bean
members.
But
usually it does, and here we come to your exception.
The
stub wants to create an instance of the base class, but get's an unknown
bean member from soap message (because the stub doesn't know
the inheriting class)
My
(not fine but working solution) is to add a dummy method to the service which
makes the stub know the inheriting class:
For
example:
void
dummyMethod(Message message)
{
}
Hope
this helps,
Markus
Hi
I thing that your metod getMessage() must return
instance of 'DefaultMessage'.Because you can not get instance
of 'Message' class.And you
write:"The 'stubt version' of getMessages() returns instances of 'Message',
not of 'DefaultMessage' "
I thing that this: "Message getMessage()" what you write mean something
like this: Message
mes=getMessage();
And can you please see my problem, and write me if it
is similar or if it is something other.And how can I solve it if you will have
some idea.
Thank you
Ales
----- Original Message -----
Sent: Tuesday, December 06, 2005 1:48
PM
Subject: AW: Abstract classes and
inheritance
Ok,
finally I solved this issue.
First I want to mention that I'm using Axis
1.2.1
The major problem was, that while creating the
stub, the inheriting class had not been produced.
(It was there, but only because I have two services
in the same stub (or two stubs in the same package) and it was
produced by the other one, which I haven't used, yet. That's why I didn't
recognize the problem.)
But there was definiteley no entry in the
XXXSoapBindingStub.java, so the stub didn't know the
class.
On
the other hand, the abstract class had been produced.
So
why did that happen?
I
found out the following:
In
the service I did not use the the inheriting class in a method and I only
used the abstract one as an array, like:
Message[] getMessage()
In
this case, the inheriting class is not generated. It's different if you
mention the abstract class somewhere in the service like
this:
Message getMessage()
Then the inheriting class will be generated,
too, and there will definiteley be an entry in the
XXXSoapBindingStub.java
Now everything works fine! :-)
Well, I'm a newbie in Webservices and maybe I did
something wrong that's supposed to be very simple,
but perhaps this helps other novices not to fall
into the same trap.
Markus
Hi,
I'm sorry, I have not got the hang of it, yet.
Markus
Hi,
do you solved your problem? Because I have
got a similar problem, and I don't know how to solve it. If you selve
it, write me please.
Thank you
Ales
----- Original Message -----
Sent: Wednesday, November 30,
2005 4:05 PM
Subject: Abstract classes and
inheritance
Hello everyone,
I got stuck with a problem concerning
abstract classes.
I've got an
abstract class called 'Message' and a concrete one called
'DefaultMessage' which does inherit 'Message'.
I've got a method getMessages() of return type
Message[].
On the server
implementation the method returns an array of type 'Message', but each
member references to an instance of 'DefaultMessage'.
On the client side I get an array with
proper length but null values. If I do not declare 'Message' as
abstract it works only if 'DefaultMessage' does not contain any bean
members.
The 'stubt version' of getMessages()
returns instances of 'Message', not of 'DefaultMessage' which should
be the case.
If I add a bean member
(like 'defaultValue') to 'DefaultMessage' I get an Exception from the
stub:
org.xml.sax.SAXException: Invalid element
in test.messenger.service.Message - defaultValue
org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
org.apache.axis.client.Call.invoke(Call.java:2451)
org.apache.axis.client.Call.invoke(Call.java:2347)
org.apache.axis.client.Call.invoke(Call.java:1804)
test.messenger.service.MessengerUserSoapBindingStub.getActiveMessages(MessengerUserSoapBindingStub.java:362)
test.messenger.gui.model.ServiceManager.getNewMessages(ServiceManager.java:57)
....
The SOAP message looks ok.
It contains 'defaultValue' and defines the array
elements as 'DefaultMessage'.
Any ideas?
Thanks a lot,
Markus
Here's my wsdd:
<service name="MessengerUser"
provider="java:RPC" >
<!-- add SoapMonitor
-->
<requestFlow>
<handler type="soapmonitor"/>
</requestFlow>
<responseFlow>
<handler
type="soapmonitor"/>
</responseFlow>
<parameter
name="className"
value="test.messenger.service.MessageUserService"/>
<parameter
name="wsdlPortType"
value="MessengerUser"/>
<parameter
name="allowedMethods"
value="*"/>
<parameter
name="scope"
value="Application"/>
<parameter
name="wsdlTargetNamespace" value="http://service.messenger.test"/>
<!--
Complex data structures: -->
<beanMapping
qname="myNS:Message"
xmlns:myNS="http://messenger.test"
languageSpecificType="java:test.messenger.Message"/>
<beanMapping qname="myNS:Response"
xmlns:myNS="http://messenger.test"
languageSpecificType="java:test.messenger.Response"/>
<beanMapping qname="myNS:DefaultMessage"
xmlns:myNS="http://messenger.test"
languageSpecificType="javatest.messenger.DefaultMessage"/>
<beanMapping qname="myNS:DefaultResponse"
xmlns:myNS="http://messenger.test"
languageSpecificType="java:test.messenger.DefaultResponse"/>
<!--
Exceptions: -->
<beanMapping
qname="myNS:MessengerException"
xmlns:myNS="http://messenger.test"
languageSpecificType="java:test.MessengerException"/>
<beanMapping qname="myNS:MessageNotExistsException"
xmlns:myNS="http://messenger.test"
languageSpecificType="java:test.messenger.MessageNotExistsException"/>
</service>
</deployment>
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