It is the name, org/devlib/schmidt/imageinfo/ImageInfo, that
is causing the exception, not just ImageInfo. You should use the
dot notation, thus
<cfobject action="CREATE" type="JAVA"
class="org.devlib.schmidt.imageinfo.ImageInfo" name="imgObj">
<cfset imgObj = imgObj.init()>
or
<cfset imgObj = createobject("java",
"org.devlib.schmidt.imageinfo.ImageInfo").init()>