[TUSCANY-475] Class cast exception on

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Java-M1
• Fix Version/s: Java-SDO-M2
• Component/s: Java SDO Implementation
• Environment: Windows XP
• Assignee: Unassigned
• Reporter: Simon Laws
• Created: 16/Jun/06 20:48
• Updated: 01/Mar/07 16:34
• Resolved: 22/Jun/06 17:30

Description

I'm trying to retrieve rows from a database via the relational DAS. When I run my test prgram I get

Exception in thread "main" java.lang.ClassCastException: org.eclipse.emf.ecore.util.EcoreEList$Dynamic incompatible with commonj.sdo.DataObject
at org.apache.tuscany.sdo.impl.DataObjectImpl.getDataObject(DataObjectImpl.java:322)
at org.apache.tuscany.sdo.interop.SDOInterop.testReadAndWriteRelationalDB2(SDOInterop.java)
at org.apache.tuscany.sdo.interop.SDOInterop.main(SDOInterop.java:136)

The code looks like.

CommandGroup commandGroup = CommandGroup.FACTORY.createCommandGroup(getClass().getResourceAsStream("interopconfig-db2.xml"));
Command read = commandGroup.getCommand("all type");
DataObject root = read.executeQuery();
DataObject firstRow = root.getDataObject("alltype[0]");

Now I expect to get a "firstRow" DataObject back. Indeed DataObjectImpl.getDataObject() casts the return to a DataObject

public DataObject getDataObject(String path)

{ return (DataObject)get(path); }

However the the DataObjectUtil.get() operation creates an Accessor and calls getAndRecycle

public static Object get(DataObject dataObject, String path)
{
Property property = dataObject.getType().getProperty(path);
if (property != null)

{ return dataObject.get(property); }

else

{ return Accessor.create((EObject)dataObject, path).getAndRecyle(); }

}

getAndRecycle call get which, because I have specified a 0 index, just returns the value which happens to be of type EcoreEList$Dynamic

So while I may have an error in my code somewhere or it might not be retrieving any data from the database a class cast exception inside of SDO doesn't seem like the correct way to tell me.