Jasper Reports, pass a list/array within a bean

Question

I have to generate a report, that displays info about one object ( so the input is only one bean ).

The first problem is - this bean should contain lists of sub-beans( for example, comments, with comment type and comment date ). So I can pass them to a sub-report.

The second problem is - there is an array of 4 sub-beans, that contains few fields. I can create a separate field for each sub-bean's property ( firstSubBeanName, secondSubBeanName... ) , but it's ugly :(. Ideally, there should be a way to access these beans in a such way :

$F{test}[0].name

Please help.

I don't see why this wouldn't work, provided that the field is declared with the appropriate type (i.e. com.foo.bar.SomeBean[]). Have you tried it? Do you have any error? — JB Nizet
– JB Nizet, Commented Oct 23, 2011 at 9:49
Well, I didn't know how to specify the type 'array of something', at least with generics it doesn't work. But it works well with lists, so the problem is resolved. — StKiller
– StKiller, Commented Oct 23, 2011 at 15:30

yoprogramo · Accepted Answer · 2011-10-23 09:53:56Z

2

If your list have a name (ie is a property of the object), you have just to pass as Data Source Expression for the subreport this property

$F{subBeansList}

The subreport should be ready to receive such kind of data. If you are using struts, it is possible you should use this class:

org.apache.struts2.views.jasperreports.ValueStackDataSource

as intermediary on your list field to be passed to the subreport.

The second question, the easy way is to use a list, so you can use this expression:

$F{test}.thelist.get(0)

answered Oct 23, 2011 at 9:53

yoprogramo

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