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JasperReport: Part Group Assignment

I figured this would be something that would be well documented as the central theme for JasperReports, however I cannot find an answer for this anywhere.

What is the purpose / function / intention of a group of parts ? Is this supposed to be the central or main part of the report?

On another matter, I was pointed out that there is a 1: 1 relationship between the detail strip and the / bean provided by JRDatasource. This revelation reveals several tangential questions:

  • In Java, you can add program elements programmatically; what happens if you specify more / less detailed bands (programmatically) than there are records / beans returned by your JRDataSource?
  • What is the relationship between a group of parts and, say, a page inside an exported PDF? Does 1 strip of data transmit per page?
  • What happens if you pass data source JasperFillManagera null? Is it still possible to have detailed stripes?

I don’t like to ask several questions at the same time, but they are so similar to each other that I would rather do it all at once than clutter up SO with several almost identical questions. Thanks in advance.

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