I have been playing with Report Books all morning and getting no output, it also does not seem to touch my JRDatasource(s) so that got me asking the question.
Are Report Books available in the community edition? Great idea for running multiple reports together as one report but only if they are available.
Report Book is supported in the community version. I've tried it on the community version and was able to create it. Just as a comment, if you are directly using JasperReports library, it may be just be easier to to combine reports from the code instead of trying to use Report Book because it offers more flexibility and I can generate reports in parallel to shorten report generation time.