Hi,
I am having a hard time using Axis with xml schema generated datatypes.
Here is my problem:
I start with an xml schema that contains some custom datatypes:
<complexType name="Sequence">
<sequence>
<element name="id" type="string" />
<element name="description" type="string" />
<element name="data" type="string" />
<element name="type" type="tns:SequenceType" />
</sequence>
</complexType>
<simpleType name="SequenceType">
<restriction base="string">
<enumeration value="dna" />
<enumeration value="rna" />
<enumeration value="protein" />
<enumeration value="nucleotide" />
<enumeration value="unknown" />
</restriction>
</simpleType>
<complexType name="ListOfSequence">
<sequence>
<element name="sequence" type="tns:Sequence" minOccurs="0"
maxOccurs="unbounded"/>
</sequence>
</complexType>
I then use xjc (from JAXB) to generate the java classes which then are used
to build webservices. When deploy the webservice, I specify the typemapping
as follows:
<beanMapping qname="myNS:ListOfSequence"
xmlns:myNS="http://cs.nmsu.edu/bsis/schema/datatype";
languageSpecificType="java:edu.nmsu.cs.bsis.schema.datatype.ListOfSequence"/>
<beanMapping qname="myNS:Sequence"
xmlns:myNS="http://cs.nmsu.edu/bsis/schema/datatype";
languageSpecificType="java:edu.nmsu.cs.bsis.schema.datatype.Sequence"/>
<typeMapping
xmlns:myNS="http://cs.nmsu.edu/bsis/schema/datatype";
qname="myNS:SequenceType"
languageSpecificType
="java:edu.nmsu.cs.bsis.schema.datatype.SequenceType"
serializer="org.apache.axis.encoding.ser.EnumSerializerFactory"
deserializer
="org.apache.axis.encoding.ser.EnumDeserializerFactory"
encodingStyle="http://schemas.xmlsoap.org/soap/encoding/";
/>
I then wrote client to visit this service. There are several problems
when doing so:
1. the Enum type SequenceType is not deserialized correctly (it generates
null pointer error). After explore the source code of EnumDeserializer, I
found that it is using a fromString() method to deserialize the Enum type.
This method is not generated with xjc. That is, the Enum Ser/Deser will not
work with xjc generated Enum type.
2. xjc convert the ListOfSequence type to a java class that contains a
List<Sequence> data member. It is serialized as an array but is not
deserialized correctly (I always get zero on the list size).
Because of those problems, I noticed that Axis (I am using the 1.3 version)
is not comforming to the JAXB framework. So I start to use the WSDL2Java
tool to generate the datatypes from the xml schema. But still I got other
problems:
1. the wsdl2java will not even generate the ListOfSequence class unless I
add another subelement to the schema definition, like so,
<complexType name="ListOfSequence">
<sequence>
<element name="sequence" type="tns:Sequence" minOccurs="0"
maxOccurs="unbounded"/>
<element name="size" type="xsd:integer"/>
</sequence>
</complexType>
which I don't like to do so (any solutions?)
2. the wsdl2java tool generates the ListOfSequence class with a Sequence
Array data member (Sequence[]). I then redeployed the webservice (with the
same typemapping as above) and wrote a client to visit it. However, it
always give me a ClassCastException as follows:
AxisFault
faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
faultSubcode:
faultString: java.lang.ClassCastException:
org.apache.axis.encoding.ser.BeanDeserializer
faultActor:
faultNode:
faultDetail:
{http://xml.apache.org/axis/}hostname:bio2
java.lang.ClassCastException: org.apache.axis.encoding.ser.BeanDeserializer
at
org.apache.axis.message.SOAPFaultBuilder.createFault(SOAPFaultBuilder.java:222)
at
org.apache.axis.message.SOAPFaultBuilder.endElement(SOAPFaultBuilder.java:129)
at
org.apache.axis.encoding.DeserializationContext.endElement(DeserializationContext.java:1087)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown
Source)
at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
at
org.apache.axis.encoding.DeserializationContext.parse(DeserializationContext.java:227)
at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696)
at org.apache.axis.Message.getSOAPEnvelope(Message.java:435)
at
org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(MustUnderstandChecker.java:62)
at org.apache.axis.client.AxisClient.invoke(AxisClient.java:206)
at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
at org.apache.axis.client.Call.invoke(Call.java:2767)
at org.apache.axis.client.Call.invoke(Call.java:2443)
at org.apache.axis.client.Call.invoke(Call.java:2366)
at org.apache.axis.client.Call.invoke(Call.java:1812)
I think the error is caused when it is trying to deserialize the Sequence[]
object contained in the ListOfSequence object. I am wondering should I tell
axis about the type mapping of an array that contains user defined
datatypes. if so, how to do it? I searched the forum for this subject but
could find very useful information.
Your help is highly appreciated.
Plus, I'd really like to use xjc generated classes since it looks much
better than the wsdl2java tool generated classes. But that means I have to
rewrite many of the ser/deser that is built into axis. The example axis gave
under samples/encoding is too naive and requires all data fields be public.
I looked at the source code for the build in ser/deserizers in axis but the
documentation is poor (the custom ser/deser is also missing from the
userguide). I am wondering can anyone provide any suggestions on how to
write ser/deser for java List like datatypes? Does other webservice
container like glassfish better at this regard? thanks again
frank
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