Bug 123035 Serialize primitive types, hashmaps and other Java classes not using Java serialization method
If you take a look at the serialized engine output, we frequently see java classes appearing. I see String class; I see PageHint class; I see Hashmap classes. All of these should be gone so that BIRT document is independent of any Java-based class serialization. DtE team will move primitive type serialization to BIRT.CORE, see 123034. Engine can use that.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/DataExtractionTask.java
{
			IBaseQueryDefinition query = (IBaseQueryDefinition)mapResultSetNameToQuery
									.get( resultSetName );
			assert query != null;
			validateSelectedColumns( query );
			
			IQueryResults queryResults = dataEngine.getQueryResults( resultSetName );
			assert queryResults.getResultIterator() != null;
			 
			currentResult = new ExtractionResults( queryResults.getResultIterator() 
					, selectedColumns, getValueExpressions( query ) );
			return currentResult;
		}
		catch ( BirtException e )
		{
			e.printStackTrace( );
		}
		return null;
	}
	
	/*
	 * data export by report item instance
	 */
	private IExtractionResults extractByInstanceId( ) throws EngineException
	{
		assert instanceId != null;
		
		assert executionContext.getDataEngine() != null;
		DataEngine dataEngine = executionContext.getDataEngine().getDataEngine();