FYI, problem #1 was that the parameters have to be "isForPrompting="false"".
But after that, it was still failing, and this time without any errors but
neither with a PDF. Added some breakpoints, and I found out that it was failing
when filling up the report (which have multiple sub-reports) but no exception
was raised. So I did the same calls but in a non-Callable context, and I got
the following error:
java.lang.ClassNotFoundException:
org.codehaus.groovy.control.CompilationFailedException
So the problem is that 3 sub-reports had Groovy as the language for expressions
instead of Java. Changed that, and now it works. I just have to find why I
don't get the exceptions when in a background task context.
PS: to enable lo4j for JasperReports:
log4j.logger.net.sf.jasperreports=DEBUG
> Hi,
>
> I have to run some Jasper Reports where the data will come out by a SQL query
> embedded in the report instead of a JRDatasource. The report I'm working
> works fine in iReport (well, except the fact that iReport is one of the worst
> app I ever used) and that report have parameters to change the SQL query. I
> was under the impression that when you build the parameters map, you can just
> include the parameter from the report into the map, like this:
>
> HashMap<String, Object> params = new HashMap<String, Object>();
> ...
> params.put("studentID", "102449");
> params.put("showAssessmentHistory", false);
> ...
> JRReportTask reportTask = new JRReportTask(location.id(), fs,
> report.__globalID(), params);
>
> But where "studentID" and "showAssessmentHistory" are parameters inside the
> report. But when I execute the report, I get a blank page, even if I do have
> data for that studentID (using the same values in iReport results with data).
> Is this the correct way to supply report parameters to the engine?
>
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