Bug 133780 Execution sequence of valueExpr(DataItem) and onCreate() is not correct.
In the attached design. There is a DataItem in the table footer that I used to do a sum of the "Amount" column. In the test, I write the onCreate() method as: params["amount"]=Total.sum(row["AMOUNT"]); It passes the aggregation value to a parameter. In the "valueExpr" I write as: "AMOUNT:" + params["amount"] The expression is expected to export the sum. Actual output is: AMOUNT:null Followings are the definitions from Rom Text Spec & Rom Scripting Spec, valueExpr usually should be evalated after the onCreate() method. DataItem.valueExpr: The expression is usually evaluated when the report is rendered, not in the Factory, though it may be evaluated in the Factory also. onCreate: Executed when the element is created in the Factory. Called after the item is created, but before the item is saved to the report document file.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ImageItemExecutor.java
handleValueImage( imgExpr, fmtExpr, imageContent );
				break;
			default :
				logger.log( Level.SEVERE,
						"[ImageItemExecutor] invalid image source" ); 
				context.addException( new EngineException(
						MessageConstants.INVALID_IMAGE_SOURCE_TYPE_ERROR ) );
				assert false;
		}
	}
	protected void handleURIImage( Expression uriExpr,
			IImageContent imageContent )
	{
		
		
		
		
		imageContent.setImageSource( IImageContent.IMAGE_URI );
		assert uriExpr != null;
		Object uriObj = context.evaluate( uriExpr );
		String strUri = null;
		if ( uriObj != null )
		{
			strUri = uriObj.toString( );
		}
		else if ( uriExpr.getExpression( ) != null
				&& uriExpr.getExpression( ).length( ) > 0 )
		{
			strUri = uriExpr.getExpression( ).toString( );
		}