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Re: WebServices Material on Wiki
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Re: WebServices Material on Wiki

  • Subject: Re: WebServices Material on Wiki
  • From: Andrew Lindesay <email@hidden>
  • Date: Fri, 19 Jan 2007 08:33:15 +1300
Hello Francis;

I have found my original description of the issue and have transcribed that to the wiki as well. Here is the body of this text.

=====================

I am building a graph of inserted/modified/referenced EO-s in the session's default EC and then persisting the changes. In order to reference inserted objects in the EC to create relationships between in-memory EO-s, I am referring to them using their temporary EOGlobalID's. For example...

boolean addFoo(
	String wosid,
	String name,
	String code,
	EOGobalID barGlobalID)


...where 'barGID' may be a temporary GID (EOTemporaryGlobalID) or may be a key GID (EOKeyGlobalID). The temporary GID's are serialising out to the client from the WO application without any difficulty. In this case, the XML chunk in the SOAP envelope looks like this...

<barGlobalID xsi:type="ns4:EOGlobalID">
<data xsi:type="xsd:base64Binary">AAB/ AAABAAAXcQEAAAABC8pbeE6Acu4F</data>
</barGlobalID>


However when I try and use this temporary GID by sending it from the client, back into the WO application for deserialisation, I end up sending this...


<barGlobalID xsi:type="SOAP-ENC:Dictionary">
<data xsi:type="xsd:base64Binary"> AAB/ AAABAAAXcQEAAAABC8pbeE6Acu4F</data>
</barGlobalID>


[I am using Apple's WebServicesCore framework and I'm not entirely sure why it is putting whitespace into the base64 encoding, but I have done independent tests which would tend to indicate that this is deserialised correctly by the deserialiser on the WO/AXIS end.]

Passing in 'null' for this argument results in no exception, passing in a temporary GID 'dictionary structure' as shown above produced the following exception and corresponding AXIS fault as shown below...


- IllegalArgumentException:
java.lang.IllegalArgumentException
at sun.reflect.UnsafeObjectFieldAccessorImpl.set (UnsafeObjectFieldAccessorImpl.java:63)
at java.lang.reflect.Field.set(Field.java:519)
at org.apache.axis.encoding.FieldTarget.set(FieldTarget.java:91)
at org.apache.axis.encoding.DeserializerImpl.valueComplete (DeserializerImpl.java:282)
at org.apache.axis.encoding.DeserializerImpl.endElement (DeserializerImpl.java:541)
at org.apache.axis.encoding.DeserializationContextImpl.endElement (DeserializationContextImpl.java:1015)
at org.apache.axis.message.SAX2EventRecorder.replay (SAX2EventRecorder.java:204)
at org.apache.axis.message.MessageElement.publishToHandler (MessageElement.java:722)
at org.apache.axis.message.RPCElement.deserialize(RPCElement.java: 233)
at org.apache.axis.message.RPCElement.getParams(RPCElement.java:347)
at org.apache.axis.providers.java.RPCProvider.processMessage (RPCProvider.java:184)
at org.apache.axis.providers.java.JavaProvider.invoke (JavaProvider.java:333)
at org.apache.axis.strategies.InvocationStrategy.visit (InvocationStrategy.java:71)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:150)
at org.apache.axis.SimpleChain.invoke(SimpleChain.java:120)
at org.apache.axis.handlers.soap.SOAPService.invoke (SOAPService.java:481)
at org.apache.axis.server.AxisServer.invoke(AxisServer.java:323)
at com.webobjects.appserver._private.WOWebService.performActionNamed (WOWebService.java:375) 

If I send a key GID as follows...

<barGlobalID xsi:type="SOAP-ENC:Dictionary">
<primaryKeys SOAP-ENC:arrayType="xsd:anyType[1]" xsi:type="SOAP- ENC:Array">
<item_0 xsi:type="xsd:int">1</item_0>
</primaryKeys>
<entityName xsi:type="xsd:string">BarEntity</entityName>
</barGlobalID>

...then it deserialises without issue. When I try to get a WSDL from a registered web service that has EOGlobalID's as parameters, I tend to get the following exception and corresponding AXIS fault. For this reason it is not possible to find out how the EOGlobalID should be communicated.

<?xml version="1.0" encoding="UTF-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/ envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<soapenv:Body>
<soapenv:Fault>
<faultcode>soapenv:Server.userException</faultcode>
<faultstring>WSDLException: faultCode=OTHER_ERROR: Can&apos;t find prefix for &apos;http://www.apple.com/webobjects/webservices/ soap/&apos;. Namespace prefixes must be set on the Definition object using the addNamespace(...) method.: </faultstring>
<detail>
<ns1:stackTrace xmlns:ns1="http://xml.apache.org/ axis/">WSDLException: faultCode=OTHER_ERROR: Can&apos;t find prefix for &apos;http://www.apple.com/webobjects/webservices/soap/&apos;. Namespace prefixes must be set on the Definition object using the addNamespace(...) method.:
at com.ibm.wsdl.util.xml.DOMUtils.getPrefix(Unknown Source)
at com.ibm.wsdl.util.xml.DOMUtils.getQualifiedValue(Unknown Source)
at com.ibm.wsdl.util.xml.DOMUtils.printQualifiedAttribute(Unknown Source)
at com.ibm.wsdl.xml.WSDLWriterImpl.printParts(Unknown Source)
at com.ibm.wsdl.xml.WSDLWriterImpl.printMessages(Unknown Source)
at com.ibm.wsdl.xml.WSDLWriterImpl.printDefinition(Unknown Source)
at com.ibm.wsdl.xml.WSDLWriterImpl.writeWSDL(Unknown Source)
at com.ibm.wsdl.xml.WSDLWriterImpl.getDocument(Unknown Source)
at org.apache.axis.wsdl.fromJava.Emitter.emit(Emitter.java:267)
at org.apache.axis.providers.java.JavaProvider.generateWSDL (JavaProvider.java:494)
at org.apache.axis.strategies.WSDLGenStrategy.visit (WSDLGenStrategy.java:72)
at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:150)
at org.apache.axis.SimpleChain.generateWSDL(SimpleChain.java:137)
at org.apache.axis.handlers.soap.SOAPService.generateWSDL (SOAPService.java:375)
at org.apache.axis.server.AxisServer.generateWSDL(AxisServer.java: 499)
at com.webobjects.appserver._private.WOWebService.performActionNamed (WOWebService.java:352)
at com.webobjects.appserver._private.WOActionRequestHandler._handleReques t(WOActionRequestHandler.java:240)
at com.webobjects.appserver._private.WOActionRequestHandler.handleRequest (WOActionRequestHandler.java:142)
at com.webobjects.appserver._private.WOWebServiceRequestHandler.handleReq uest(WOWebServiceRequestHandler.java:95)
at com.webobjects.appserver.WOApplication.dispatchRequest (WOApplication.java:1306)
at nz.co.lindesay.common.webobjects.LEWOApplication.dispatchRequest (LEWOApplication.java:537)
at nz.co.chong.cbw.webobjects.Application.dispatchRequest (Application.java:82)
at com.webobjects.appserver._private.WOWorkerThread.runOnce (WOWorkerThread.java:173)
at com.webobjects.appserver._private.WOWorkerThread.run (WOWorkerThread.java:254)
at java.lang.Thread.run(Thread.java:552)
</ns1:stackTrace>
</detail>
</soapenv:Fault>
</soapenv:Body>
</soapenv:Envelope>

Finally, if I look at the "com.webobjects.webservices.support.xml.WOGlobalIDDeserializer" class, it has a "byte[] data" instance variable so I can assume that at least some attempt has been made to deserialise temporary GID's.

=====================

My failed attempt to serialise/deserialise temporary GID's in WebServices. This may be a good starting point for anybody else wanting to do this stuff and may also provide a good starting point for anybody wanting to write a custom serialiser/deserialiser.

Could you tell more about what did fail exactly? Because checking WOGlobalIDSerializer and WOGlobalIDDeserializer in WebObjects 5.3.2 reveals that these classes are supposed to be able to handle EOTemporaryGlobalID as well: the data should be serialized in raw bytes array. EOTemporaryGlobalID instances aren't catched by the serialization / deserialization process? An exception is thrown? 

___
Andrew Lindesay
www.lindesay.co.nz



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References: 


 >WebServices Material on Wiki (From: Andrew Lindesay <email@hidden>)


 >Re: WebServices Material on Wiki (From: Francis Labrie <email@hidden>)






    

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