I was able to find a workaround for my problem. The solution is in two parts:
1) This blog entry from Bruce Phillips who gives a walkthrough on
solving exactly this problem:
http://www.brucephillips.name/blog/index.cfm/2008/7/12/Using-The-JasperReports-Struts2-Plugin-A-Main-Report-And-A-Subreport
That it works in JSP is meaningless--the two mechanisms are nothing
alike. The error message describes exactly what the problem is; you're
passing a list, not something that JR can use.
Tragically, I don't actually remember what I did to fix this, although
I thought I had changed the plugin to han
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