Re: WebObjects: No serializer found for class Student in registry...
Re: WebObjects: No serializer found for class Student in registry...
- Subject: Re: WebObjects: No serializer found for class Student in registry...
- From: Francis Labrie <email@hidden>
- Date: Mon, 12 Apr 2004 11:51:32 -0400
Hi,
Ismael Nass-Duce wrote:
[...]
Is there a WebObjects tutorial that shows how to create a simple
serializer/deserializer that one can use to pass
custom objects to a web service?
The easiest way to create Web Services Java serializer / deserializer
is to use Axis' BeanSerializer and BeanDeserializer. But you can use
these serialization classes only if your class is simple, with a setter
and a getter for each attribute.
So, to add serialization factories for the following simple Student
class below:
public class Student implements java.io.Serializable {
private String _firsName;
// [Other attributes...]
public String getFirstName() {
return(_firstName);
}
public void setFirstName(String firstName) {
_firstName = firstName;
}
// [Other setters and getters...]
}
You'll have to register serializations factories to
com.webobjects.appserver.WOWebServiceRegistrar if you are about to
publish this class through Web Services, and / or to
com.webobjects.webservices.client.WOWebServiceClient instance if you
are about to access a Web Service publishing such Student objects. In
both case, you'll have to call the
registerFactoriesForClassWithQName(SerializerFactory,
DeserializerFactory, Class, QName) method like this:
BeanDeserializerFactory deserializer;
BeanSerializerFactory serializer;
QName qName;
qName = new QName("http://mynamespacebase/webservices/soap/";,
"Student");
serializer = new BeanSerializerFactory(Student.class, qName);
deserializer = new BeanDeserializerFactory(Student.class, qName);
// For publishing
WOWebServiceRegistrar.registerFactoriesForClassWithQName(
serializer, deserializer, Student.class, qName);
// For accessing
WOWebServiceClient client = new WOWebServiceClient(webServiceURL);
client.registerFactoriesForClassWithQName(
serializer, deserializer, Student.class, qName);
The Web_Services.pdf document says the following under "Serialization
and Deserialization of Objects":
"Complex classes require a custom serialization and deserialization
strategy. WebObjects provides serializers and deserializers for [most
of its classes]. If you have special classes that required a special
serializer and deserializer, you have to create them.
Creating serializer and deserializer classes is a simple process, but
requires knowledge of SAX (Simple API for XML). To learn how to
process
SAX callbacks in your serializers and deserializers, see Java & XML
(OReilly)."
I tried the O'Reilly book, but found myself getting no where.
You should check SAX and the Axis documentation to understand how XML
serialization works in order to create factories for more complex
objects requiring special org.apache.axis.description.TypeDesc schemas.
Essentially, you'll then need to build serialization and a
deserialization classes:
public class MyClassSerializer implements
org.apache.axis.encoding.Serializer {...}
public class MyClassDeserializer extends
org.apache.axis.encoding.DeserializerImpl implements
org.apache.axis.encoding.Deserializer {...}
Finally, you'll need simple a serialization factory class for both.
Usually, I define them as serializer / deserializer inner class:
public class MyClassSerializerFactory extends
org.apache.axis.encoding.ser.BaseSerializerFactory {
private MyClassSerializerFactory() {
super(MyClassSerializer.class);
}
}
public class MyClassDeserializerFactory
extends org.apache.axis.encoding.ser.BaseDeserializerFactory {
private MyClassDeserializerFactory() {
super(MyClassDeserializer.class);
}
}
Kind regards,
--
Francis Labrie
Saint-Bruno-de-Montarville, Quebec, Canada
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