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
throw new EngineException( "Invalid Columns" );
				}
			}
		}
		else
		{
			if ( exprs.size( ) <= 0 )
			{
				throw new EngineException( "Can't exported data in groups" );
			}
			else
			{
				selectedColumns = new String[exprs.size( )];
				Iterator iter = exprs.iterator( );
				
				for ( int i = 0; i < selectedColumns.length; i++ )
				{
					IScriptExpression expr = (IScriptExpression) iter.next( );
					selectedColumns[i] = expr.getText( );
				}
			}
		}
 	}
	private Collection getValueExpressions( IBaseQueryDefinition query )
	{
		ArrayList valueExprs = (ArrayList)mapQueryToValueExprs.get( query );
		return valueExprs;
	}
}