Question

java使用Ireport问题！我不要使用F参数，报表界面里也只有P参数，可总是一直报错！求高手啊，分好说！

一开始这样（传新空数组或者NULL都报这错）：JRBeanCollectionDataSource jrds = new JRBeanCollectionDataSource(new ArrayList());
JasperPrint jasperPrint =
JasperFillManager.fillReport(
jasperReport,
parameters,
jrds);
JasperPrintManager.printReport(jasperPrint, false);
报错如下：net.sf.jasperreports.engine.JRException: Invalid page index range : 0 - -1 of 0
at net.sf.jasperreports.engine.print.JRPrinterAWT.printPages(JRPrinterAWT.java:127)
at net.sf.jasperreports.engine.print.JRPrinterAWT.printPages(JRPrinterAWT.java:88)
at net.sf.jasperreports.engine.JasperPrintManager.printPages(JasperPrintManager.java:374)
at net.sf.jasperreports.engine.JasperPrintManager.printReport(JasperPrintManager.java:265)
然后查了下API发现可以不传JRBeanCollectionDataSource 如下直接：
JasperPrint jasperPrint =
JasperFillManager.fillReport(
jasperReport,
parameters);
JasperPrintManager.printReport(jasperPrint, false);可还是报一样的错，这可如何是好愁死了！附上报表截图，全设置的String类型！

Answer 1

没用过Ireport

猜测一下。
会不会是
${P}${.....}
这样的写法。
仅供参考