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From "Andrew Hodgson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (WW-2776) Exception thrown for subreports in non-splitting bands containing collections that might need to be split.
Date Tue, 15 Sep 2009 09:17:33 GMT

    [ https://issues.apache.org/struts/browse/WW-2776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46746#action_46746
] 

Andrew Hodgson commented on WW-2776:
------------------------------------

IMHO, coupling between plugin and JasperReports is quite brittle.  dataSource plugin parameter
could / should be optional, and alternative dataSource types such as JRRewindableDatasource
could be supplied as report parameter.

See WW-3245 for an example of how this can be achieved (this example is for a Hibernate Session,
but alternative connection and data source types could be supported with a little more work).

Use of report parameters to supply connection / data source is normal practice for Jasper
users, so user base should be relatively familiar with this method of usage.

> Exception thrown for subreports in non-splitting bands containing collections that might
need to be split.
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: WW-2776
>                 URL: https://issues.apache.org/struts/browse/WW-2776
>             Project: Struts 2
>          Issue Type: Improvement
>          Components: Plugin - JasperReports
>    Affects Versions: 2.1.6
>            Reporter: Ben Morgan
>             Fix For: 2.2.x
>
>
> "net.sf.jasperreports.engine.JRException: The subreport is placed on a non-splitting
band, but it does not have a rewindable data source."
> The ValueStackDataSource implements JRDataSource, not JRRewindableDatasource, If a "non-splittable"
subreport iterates over a collection that might go over the page boundary, an exception is
thrown because it cannot rewind the collection.

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