[WW-2333] ValueStackDataSource implementation leads to class cast exceptions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: 2.0.11
• Component/s: Plugin - JasperReports
• Assignee: Unassigned
• Reporter: Thorsten Schäfer
• Created: 21/Nov/07 16:32
• Updated: 16/Jun/22 09:07
• Resolved: 16/Jun/22 09:07

Description

Assume you have a class Foo that has a Collection of Bar's. Without using Struts, the expected behavior of a report that takes Foo's as input is, that a reference $F

{bar}

returns a java.util.Collection (of Bar's). However, this will not be the case when using the ValueStackDataSource implementation; an instance of ValueStackDataSource is returned instead of a collection. If the method "getFieldValue" gets called, it checks if the field value is iteratable (which is true for collections) and then returns a new ValueStackDataSource instead of the field value itself. I assume that this behavior breaks many reports.