This solution will not work, probably it was Mansour's unintentional
typo. I think he meant to say:
<applet code="MyClass.class" archive="MyArchive.jar?=<?php print
date('U') ?>" width=xx height=xx>
This might work, haven't tried it myself, but I do know that does when
it comes to caching of images.
Anyway, I recognise the problem of the OP when I was still using classic
ASP or PHP (a long time ago ;-) ), but since this is a Java/JSP related
issue, the above solution may not make any sense to the people reading
this newsgroup.
The recommended way of including embedded objects, like JAR's or Flash
movies, has always been a pain because of the way different browsers
interpret these things (EMBED or OBJECT... etc..).
The JSP specification has a nice way of including JAR's (<jsp:plugin...
/>), which tries to determine how the requesting browser likes to
include an embedded object. However, you're not allowed to use variables
to specify the name of the JAR with this built-in function.
Nowadays, it even becomes harder because of the patent-violation that
Microsoft has with EOLAS, regarding the way-of-loading-plug-ins in
Internet Explorer. It requires a visitor to click on an embedded object
to active it before use.
Microsoft's preferred solution is to load the embedded object through
scripting, which indeed solves the problems of loading embedded object
in Internet Explorer
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/overview/activating_activex.asp.
(Please note, that I do not endorse Microsoft in ANY way, the policy of
my company is that we make sure that our applications work and look the
same in IE (Windows), Firefox (Multi-platform), and Konqueror (Linux) at
least).
This still doesn't solve the solve the problem of the OP, but there are
ways to do this...
My solution back in the days of using Classic ASP or PHP was to generate
a JAR with the name it intended to have (i.e.
'C:\internet\www.mydomain.com\securedapplet.jar') in a directory which
wasn't accessible by the web browser. When the page that was responsible
for delivering the JAR to the browser was requested, that page would
create a unique random name for that JAR for that request, and copy the
original file to a directory accessible by the webserver (i.e.
'C:\internet\www.mydomain.com\www\applets\mysecuredapplet1234567.jar'
and serve that file, for each request. Of course, before each request,
it would *try* to delete every other file in that directory before the
copy. This worked, because if an existing
'C:\internet\www.mydomain.com\www\applets\uniquename'.jar that existed,
but was in use by another request by a random user could not be deleted,
so it was skipped but deleted the next time a request was made.
This also meant, that I didn't have to ask my clients to clear their
plug-in cache or browser-cache every time I made an update to the JAR.
Now, how do we create a solution for the problem of renaming the JAR
during the copy while still using it in the standard JSP solution?
I have a few solutions to this, though I'd rather see that the JSP
specification would allow for having variable EL expressions for the JAR
and other's in the <jsp:plugin... /> tag.
My solutions are something for tomorrow, or the day after, since it's my
birthday today and though I have two days off, I've been slightly
celebrating. These few glasses of wine make me become unstable.
I hope I didn't make it too confusing... the proposed solutions
shouldn't be too hard. Let me now if anyone's interested and I'll reply
to this list soon.
Kind regards,
Stephan van Loendersloot.
I am new to JSP but this issue has nothing to do with tomcat as I have
gone through this with apache. The browser keeps a version of the
applet. I think you have to clear the java cache to fix this. However
a work around, was to put the date and time after the javaclass. for
example: <applet code="MyClass.class" archive="myJar.jar?v=theDate">
I am not sure how to automate this in JSP, but that's what I did in
PHP, and it works great.
<applet code="MyClass.class" archive="MyClass.class?v=<?php print
date('U') ?>" width=xx height=xx>
This will force the browser to obtain the latest version of the code
every time. Maybe you can find out how to do the same in JSP.
I hope this helps.
Jose Roberto Torres wrote:
Good day every one.
I am using the following:
*Linux Suse 10.1.
*Tomcat 5.0.28
*JDK 1.5
*MySql database
I am having problems making tomcat show the correct version of my
application. I am working with an applet that uses servlets to
connect to a MySql database. From the beginning I had no problems
with it, but two days ago the tomcat started to display an older
version of the applet.
I am calling the applet like this "192.168.1.80/prime/servlets" to
test it and now is showing the correct applet only in the application
server, if i try to access the applet from another computer in the
LAN it shows a muuuuchh older version of the applet,
I have tried erasing my web browser cache, clearing the java
classloader cache (Thank you Antonio Petrelli) and i have erased all
the .class files and re-builded them to see if something changed.
I don´t know if Tomcat makes a copy of this files or if there is a
way to refresh the applets tomcat shows.
If there is anything else I am missing to make my problem clearer
please let me know.
Jose Roberto Torres Sanchez
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