I was creating a HTML Jasper Report. It was working fine, but I saw many failed images. When I see the source, I found many image tags like the following.
<img alt="" src="nullpx" style="width: 20px; height: 24px;"/>
When I googled, I found an image property need to be set to give the proper image name.
JRExporter exporter = new JRHtmlExporter();
I need to search whether we can avoid it. anyway this is a temporary solution. I created a servlet to create transparent empty GIF and called it over here.