Charts not working/HTML Jasper report from Servlet

[nasimjo]

Im using Jasper reports rendered as html throughout a servlet.

I have all my reports working except for those that do include charts, where the charts image do not appear in the result of hitting the servlet.

 

that is, despite the fact that the imageServlet URL is set properly in the web.xml. and noting that no other image rendering problems were reported

[teodord]

Hi,

 

Maybe the other images that seem to work are lazy loaded (isLazy="true") and in fact the image servlet is not mapped correctly or it does not work for some reason.

 

I hope this helps.

Teodor

[nasimjo]

well, i know that the image Servlet is working by the fact that i use

Code:

htmlExporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, new Boolean(true)); 

 

and when i change the imageServlet's mapping or name that page become full of "not rundered image" icons replacing the layout images.

 

So this is where i got sure the imageServlet IS WORKING!

[teodord]

Hi,

 

Most of the times, the reason for not seeing elements in HTML is that they overlap with some other elements. Note that the HTML exporter is a grid exporter and these do not support overlapping elements.

 

Please see this:

http://jasperforge.org/sf/wiki/do/viewPage/projects.jasperreports/wiki/FAQ9

 

I hope this helps.

Teodor

[nasimjo]

I actually know that .... i tried it with a bare naked report with only the chart in it ... and still facing the problem.

 

just for instance, and it case it might help. hitting the imageServlet with the URI referenced by the image (which is in my case: http://localhost:8084/JasperTest/image?image=img_0_0_41)

results in this :

 

Code:

javax.servlet.ServletException: No JasperPrint documents found on the HTTP session.
	net.sf.jasperreports.j2ee.servlets.ImageServlet.service(ImageServlet.java:98)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)

[nasimjo]

finally, a colleague suggested a line of code he remembered he used once upon a time ... and it worked :)

 

here it goes for those who might face the case

 

Code:

request.getSession().setAttribute(
                    ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint);

[crystalzting]

hi, i have the same problem that the chart cannot show in html file...

even though i did what you said, there still the problem. anymore tips??

thx. :huh:

[jfkang]

I am meeting this proplem too:

when I use the following link

 

http://localhost:9080/RdzxJbpm/servlet/image?image=img_0_1_0

 

Exception shows the following:

javax.servlet.ServletException: No JasperPrint documents found on the HTTP session.

net.sf.jasperreports.j2ee.servlets.ImageServlet.service(ImageServlet.java:97)

javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

 

 

but if I use http://localhost:9080/RdzxJbpm/servlet/image?image=px

It's no problem

 

can anybody give more message, thx

Post edited by: jfkang, at: 2008/04/08 17:36

[malani_manish]

I am also facing the same issue.

I have also tried quering servlet from url for 'px' and 'img_0_0_9' and face the same result as jfkang is getting.

can anybody help me to produe chart image in html export.

I have ensured that no overlapping, and image uri parameter is set very well, servlet working absolutely fine for blank images.

please help.

[ajithn]

Hi all,

I'm also got this issue. Charts works fine for the PDF reports. but HTML report does not display that chart.

any hints ??

Thanks

[teodord]

Hi,

 

It is almost impossible to tell what is wrong in your case withouth actually sitting at your desk.

So I suggest you investigate the situation yourself, trying to understand why the /demo/samples/webapp sample shipped with the JR project distribution package works.

 

I hope this helps.
Teodor

 

[rbabutin]

Thank you nasimjo!! That was exactly the missing piece in the puzzle for me trying to display the chart. Works great :)

[ajithn]

Hi All ,

plz follow the  steps given below  to view charts @ Html reports

1. set the image servlet @ your web.xml file

 <servlet>
            <servlet-name>ImageServlet</servlet-name>
            <url-pattern>/servlets/image</url-pattern>
            <servlet-class>net.sf.jasperreports.j2ee.servlets.ImageServlet</servlet-class>
</servlet>

 

2. set the follwing parameters @ your report generation servlet

jrHtmlExporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "../servlets/image?image=");

request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE

, jasperPrint);

 

Thanks

ajithn

 

 

Post Edited by ajithn at 06/14/2010 08:55

[mici387]

Gracias :D  ajithn funcion perfecto :P