On 05.10.2016 16:16, Boyle, James A wrote:
Hello,
I have a web application compiled under Java 1.8 running in a
Tomcat 8 container on a Linux web server. The client side devices are Windows 7
desktops with USB attached printers. The basic operation is a query to a SQL
Server database for the relevant address and then to print the information on
an attached printer (Zebra ZM400 or ZP505). The first time through the print
control on the screen activates pretty quickly, but successive retrievals
introduce a 10-15 second delay before the label can be printed. The application
is deployed as a WAR file and the print applet is signed with SHA-2. The
prevailing theory is that the applet is being downloaded for each label being
printed and that this is introducing the performance delay we are seeing. Is
there a way to properly cache the applet, so that it does not need to be
downloaded to the client workstation each time? Any insight would be greatly
appreciated. Thanks.
Hi.
From your description, this does not look at all like a Tomcat problem, or even really a
webserver problem.
It looks more like an issue on the client side.
If the client is indeed downloading the same applet over and over, that can only be
because it is issuing HTTP retrieval requests to the server over and over.
Why it would do that, is more a question of the content of the initial page, and how the
browser reacts to it.
You should probably install (or use) some browser plugin, which lets you trace the
conversation between browser and server. Maybe that would give you a better hint about why
this is happening.
Most recent browsers have such a debugging tool already built-in.
If not, then it depends a bit on the browser. For IE for example, you could have a look at
"Fiddler2".
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