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From "Kevin Williams" <kevin...@qwest.net>
Subject Re: DataObject/DataGraph Serialization & DataGraphRoot
Date Fri, 25 Aug 2006 19:30:15 GMT
It may be that your remote client has not initialized the SDO/EMF 
environment properly and I think that we need some help from the SDO 
team.  I have copied this to the dev list since not everyone has 
registered yet for the user list.

--Kevin



Luciano Resende wrote:

> Hi Scott
>
>    So, here is a quick example from our unit testings :
>
>     /**
>      * Read a specific customer
>      */
>     public void testReadSingle() throws Exception {
>
>         //Create and initialize command to read customers
>         DAS das = DAS.FACTORY.createDAS(getConnection());
>         Command readCustomers = das.createCommand("select * from 
> CUSTOMER where ID = 1");       
>
>         //Read
>         DataObject root = readCustomers.executeQuery();
>        
>         //Verify
>         assertEquals(1, root.getInt("CUSTOMER[1]/ID"));
>     }
>
> If you get a reference to root first, then try to access the customer 
> information, do you still have this problem ?
>
> Maybe something like this :
>
> DataObject root = readCust.executeQuery();
> cust = root.getDataObject("CUSTOMER")
>
> Please let me know if this helps...
>
> - Luciano
>
>
> On 8/24/06, *Scott Kurinskas* <scott.kurinskas@gemstone.com 
> <mailto:scott.kurinskas@gemstone.com>> wrote:
>
>     Hi,
>
>     Now that my DAS example is up and running, I'm trying to move my
>     example to
>     a client/server environment and integrate it with my product.  My
>     use-case
>     is very simple, a client makes a request to the server, the server
>     fetches
>     the result from the database and returns the DataObject back to
>     the client.
>     The server side code looks like the following:
>
>     das = DAS.FACTORY.createDAS(getConfig("CompanyConfig.xml"),
>     connection);
>     String sql = "Select * from customers where
>     customers.customerNumber = " +
>     key;
>     Command readCust = das.createCommand(sql);
>     DataObject cust = readCust.executeQuery();
>     return cust;
>
>     The code executes fine on the client but for some reason the
>     client is
>     throwing the exception below.  The client should be deserializing the
>     response into a DataObject, but for some reason its complaining
>     about class
>     DataGraphRoot not found.  The same code executing in a app works
>     great.
>
>     Thoughts?
>
>     Thanks again,
>     Scott
>
>     Caught unexpected Exception
>     org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Class
>     'DataGraphRoot' not found.
>     ( file:///C:/Documents%20and%20Settings/skurinsk/workspace/SDO%20
>     <file:///C:/Documents%20and%20Settings/skurinsk/workspace/SDO%20&%20Cache%20
>     <file:///C:/Documents%20and%20Settings/skurinsk/workspace/SDO%20&%20Cache%20>
>     Client/all.datagraph> &%20Cache%20Client/all.datagraph, 5, 22)
>     at
>     org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.handleErrors(XMLLoadImpl.java:80)
>     at
>     org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java :189)
>     at
>     org.apache.tuscany.sdo.util.DataGraphResourceFactoryImpl$DataGraphResourceIm
>     pl$LoadImpl.load(DataGraphResourceFactoryImpl.java:452)
>     at
>     org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java
>     :1
>     79)
>     at
>     org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1089
>     )
>     at
>     org.apache.tuscany.sdo.impl.DataGraphImpl$EDataGraphExternalizable.readExter
>     nal(DataGraphImpl.java:665)
>     at
>     java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1758)
>     at
>     java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1716)
>     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java :1304)
>     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
>     at
>     org.apache.tuscany.sdo.helper.HelperProviderImpl$ResolvableImpl.readDataObje
>     ct(HelperProviderImpl.java:205)
>     at
>     org.apache.tuscany.sdo.helper.HelperProviderImpl$ResolvableImpl.readExternal
>
>     (HelperProviderImpl.java:144)
>     at
>     commonj.sdo.impl.ExternalizableDelegator.readExternal(ExternalizableDelegato
>     r.java:80)
>     at
>     java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1758)
>     at
>     java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1716)
>     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
>     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
>     at
>     com.gemstone.gemfire.DataSerializer.readObject(DataSerializer.java:3200)
>     at
>     com.gemstone.gemfire.internal.util.BlobHelper.deserializeBlob(BlobHelper.jav
>     a:55
>
>
>
>
> -- 
> -----------------------------------------------------
> Luciano Resende
> SOA Opensource - Apache Tuscany
> ----------------------------------------------------- 




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