reporting - Whats a good API for generating reports for a java web application? -

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I have a J2EE application that contains several reports, the status is now low:

Report The values ​​of the filters are sent primarily to the DWR to apply, the data is derived from Oracle DB throwing DB processes and returns to the client.

However, some customization requirements are now painful to apply filters, columns, orders, ...), and these changes because we modify JSP, DB processes, applications themselves Required ...

Which API do you recommend for such reports?

is popular as I have heard.
If you want to take commercial route


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