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From "Kevin Williams" <kevin...@qwest.net>
Subject Re: DataObject/DataGraph Serialization & DataGraphRoot
Date Fri, 25 Aug 2006 20:03:13 GMT
The RDB DAS creates the graph and corresponding Types dynamically from 
the database query results.

Frank Budinsky wrote:

>The problem seems to be that the metadata for class DataGraphRoot is not 
>registered on the client. Is that the only missing metadata? What about 
>the metadata for the rest of the model. I can't provide any more help 
>without more details about how the metadata is being defined.
>
>Frank.
>
>"Kevin Williams" <kevincbw@qwest.net> wrote on 08/25/2006 03:30:15 PM:
>
>  
>
>>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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>>
>>    
>>
>
>
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>
>
>
>  
>



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