How shall I go about to design report with java DAO sources

Hi,
 
I'm new to Birt and I am considering using it to generate a few reports from within my webapp. The reports will be utilizing existing data services that returns java object, list etc. how shall can I pass java objects to the report runtime and how can I access them in report. 

for instance: 
- Order Object has OrderLineItems (List)
 
How shall I go about the get order data and iterate through the OrderLineItems and populate them.

Any help would be much appreciated.
 
Many thanks

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mwilliams

There is a POJO data source available. If that doesn't work, it sounds like you'd be able to use a scripted data source to access your object (open method of scripted data set), then iterate through the list and create your result set (fetch method of data set).