Using Subreports with JasperReports/JasperAssistant

Create Report
Add subreport element
Right click subreport
properties
look through properties.

Put the following:
Connection Expression $P{REPORT_CONNECTION}
DataSource Expression (blank)
Expression click the + and put, in quotes, the name of the jasper file to use as the subreport
make sure the type is set to java.lang.String
Parameter Expression Map: $P{REPORT_PARAMETERS_MAP} (optional)
Using cache: false

In the outline view, click the + next to the subreport
Add parameters for each parameter to pass to the subreport. Set the key to your parameter name. Set the value to a field or parameter.


Create new Report (the sub report)
Add parameters passed in from master
Add fields
Add query



One note, I haven't yet figured out how to load the subreport in a JSP... The simplest way is to dump it in the web apps classpath, such as WEB-INF/classes. Report back later on this...