Hi Teodor,
JFreeChart is used for the chart generation if that is what you mean. I
have not written any custom JRRenderable, and I thought it should be
fairly straightforward. Here is a little snippet from my prototype
report servlet, also showing how the map content was printed:
----------snip
JasperCompileManager.compileReportToFile(jrxmlFile, jasperFile);
JasperPrint jasperPrint = JasperFillManager.fillReport(
jasperFile, new HashMap(), dbConnection);
JRExporter exporter = new JRHtmlExporter();
StringBuffer htmlBuffer = new StringBuffer();
Map imagesMap = new HashMap();
request.getSession().setAttribute("IMAGES_MAP", imagesMap);
exporter.setParameter(
JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
exporter.setParameter(
JRExporterParameter.JASPER_PRINT, jasperPrint);
exporter.setParameter(
JRExporterParameter.OUTPUT_STRING_BUFFER,htmlBuffer);
exporter.setParameter(
JRHtmlExporterParameter.IMAGES_URI,
"/imageservlet?image=");
exporter.exportReport();
for(Object key : imagesMap.keySet())
System.out.println(
"map entry: key="+key+", value="+imagesMap.get(key));
----------snip
I'm running it on Tomcat5.5/JDK1.5.0_06/WinXP, if that could provide any
further answers. The jrxml file was generated with iReport. What makes
it really strange is, as I said, storing the chart image on disk is no
problem.
Regards,
Kjetil
> -----Original Message-----
> From: Teodor Danciu [mailto:[EMAIL PROTECTED]
> Sent: 12. januar 2006 19:50
> To: Kjetil Hoem
> Cc: jasperreports-questions@lists.sourceforge.net
> Subject: Re: [jasperreports-questions] Empty image map value
>
>
> Hi,
>
> Are you using our chart component or is something custom-made?
> I'm interested in the JRRenderable implementation behind the scenes.
>
> Thanks,
> Teodor
>
>
> Kjetil Hoem wrote:
>
> >Hi all,
> >
> >I have a problem that I have been unable to find any information on
> >either in the manual, faqs, forums and this list's archives:
> >
> >The image map (JRHtmlExporterParameter.IMAGE_MAP) populated by the
html
> >exporter contains null for what was supposed to be my chart image. A
> >printout of all the items contained in this map looks like this:
> >
> >map entry: key=px, [EMAIL PROTECTED]
> >map entry: key=img_0_0_1, value=null
> >
> >As you can see, the "px" entry contains an object, and I can confirm
> >that it is the correct image data object, which works fine. The
> >"img_0_0_1" entry, on the other hand, contains nothing even though
the
> >KEY obviously is present. When I tell the exporter to store the
images
> >on disk, everything seems to be fine, and the chart is plotted
> >wonderfully correct.
> >
> >But I don't want to store the images on disk. Does anyone have any
idea
> >what may cause this strange behavior?
> >
> >Regards,
> >Kjetil Hoem
> >
> >
> >
> >
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