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
imgExt = strValue.toString( );
				imgExt = FileUtil.getExtFromType( imgExt );
			}
		}
		if ( imgData != null )
		{
			imageContent.setData( imgData );
			imageContent.setExtension( imgExt );
			imageContent.setURI( null );
		}
	}
	protected void handleFileImage( Expression fileExpr,
			IImageContent imageContent )
	{
		String imageFile = "";
		Object file = context.evaluate( fileExpr );
		if ( file != null )
		{
			imageFile = file.toString( );
		}
		else if ( fileExpr.getExpression( ) != null
				&& fileExpr.getExpression( ).length( ) > 0 )
		{
			imageFile = fileExpr.getExpression( ).toString( );
		}
		handleFileImage( imageFile, imageContent );
	}
	protected void handleFileImage( String imageFile, IImageContent imageContent )
	{