_THIS reference not working

[ilkkayli]

I'm moving from iReport to Jaspersoft Studio. In iReport I was using my own java objects by _THIS reference like this:

<field name="_THIS" class="my.custom.java.object"/>

When I try to compile my report in JasperSoft Studio, I get error like this:

java.lang.RuntimeException: java.lang.NoClassDefFoundError: Unable to load class my.custom.java.object due to missing dependency net/sf/jasperreports/engine/data/JRBeanCollectionDataSource

Can someone help me? It works if I define all fields from my.custom.java.object one by one, but in some cases it would be very handy to use the object via _THIS reference.