BIRT supports accessing data using JavaScript code. This type of data source is called a scripted data source. Using a scripted data source, you can access objects other than the built‑in data source types.

Because the JavaScript code for accessing and managing a scripted data source can wrap Java objects, a scripted data source can access an EJB, an XML stream, a Hibernate object, or any other Java object that retrieves data. A scripted data source must return data in tabular format, so that BIRT can perform sorting, aggregation, and grouping.

As of 4.2.2, Cassandra scripted data sources can be accessed using the Hector API set.