IE and Java Classes

[Kent Feiler]

Can anyone tell me how IE processes Java Objects? Does it use a JVM
that's embedded in the browser or one that's on the user's system?
The reason I'm asking is that I have an applet that plays sounds. I
use an Applet tag for Netscape/Mozilla and an Object tag for IE. It
works fine on my system for all three browsers, it works fine for
anyone anywhere using Netscape/Mozilla, but doesn't work at all for
many people using IE, even the same version of IE that I have.

What's going on? It seems that my system is different than other
people accessing the pages, but I don't know how. The only difference
I can think of is that I've installed the Java SDK and they haven't.
Here's the URL for the page involving the sounds:

Zoo.KentFeiler.com

Any help would be greatly appreciated.

Regards,


Regards,


Kent Feiler
(e-mail address removed)
www.KentFeiler.com

 

[Tor Iver Wilhelmsen]

Can anyone tell me how IE processes Java Objects? Does it use a JVM
that's embedded in the browser or one that's on the user's system?

for applet elements, unless you let Sun's JRE "take over" (which it
quietly does on newer installs) it uses the VM in msjava.dll.

The reason I'm asking is that I have an applet that plays sounds. I
use an Applet tag for Netscape/Mozilla and an Object tag for IE. It
works fine on my system for all three browsers, it works fine for
anyone anywhere using Netscape/Mozilla, but doesn't work at all for
many people using IE, even the same version of IE that I have.

But when you use OBJECT you're probably using the plugin instead, and
unless they have installed the JDK or JRE they will not have that.

Try using APPLET for everybody.

 

[Kent Feiler]

for applet elements, unless you let Sun's JRE "take over" (which it
quietly does on newer installs) it uses the VM in msjava.dll.


But when you use OBJECT you're probably using the plugin instead, and
unless they have installed the JDK or JRE they will not have that.

Try using APPLET for everybody.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Thanks for your help.

APPLET doesn't work on IE. The situation seems to be that
APPLET/EMBED works for Netscape/Mozilla/Firebird, but OBJECT doesn't
work, and APPLET/EMBED don't work for IE but OBJECT does. So...I've
been using a Javascript sniffer and writing an APPLET for
Netscape/Mozilla and an OBJECT for IE. Life is sweet! ; >)

I'm sure, based on the endless time required to load the APPLET, that
Netscape/Mozilla use the plugin. I'm also sure that based on the
instantaneous load time for IE, that it doesn't use it. Likely it uses
MSJAVA.DLL, but is that a standard part of IE (or windows), or is it
conditional on the browser version version or the setup parameters?
Also, is that dll written only by IE or is it overwritten when you
install Mozilla or Netscape?

But this does seem like the answer.


Regards,



Regards,


Kent Feiler
(e-mail address removed)
www.KentFeiler.com

 

[Tim Tyler]

: Perhaps this has something to do with how it's invoked. Here's the
: APPLET:

: <applet name="playit" code="PlaySound.class" width="1" height="1">
: </applet>

: It's "played" by a Javascript routine that passes it a sound file,
: i.e:

: function sounds ()
: {
: document.playit.playnow('../bin/fox.wav');
: }

: This works fine for Netscape/Mozilla, but IE gives me, "Object doesn't
: support this Property or Method."

Could be.

Also, if you're trying to play it using an Java 1.1 JVM, be aware that
that only supports the ".au" file format - and only certain subsets of
that.

 

[Jon A. Cruz]

Also, if you're trying to play it using an Java 1.1 JVM, be aware that
that only supports the ".au" file format - and only certain subsets of
that.

Actually, it only supports a single format:


8 bit, u-law, 8000 Hz, one-channel, Sun ".au" files

Note that sample-rate. Might not be the "8KHz" that some expect. (Some
used 8012 for 8KHz)


http://ptolemy.eecs.berkeley.edu/java/audio/

 

[Jon A. Cruz]

otherwise ie might not be able to load the classes, and may
report that it cant find the classes. And remember that
ie does not read Jar archives, only class files and Cab
archives.

Actually, Microsoft added Jar support way back while they were still
plaing nice with Sun.

For example, if you read Microsoft knowledge base article # 168941, it
states that

The Microsoft VM supports uncompressed and compressed JAR levels 0 and 1, but not signed JAR.




It was a standard piece of ie for some years, but is no more.

Actually, it was a standard piece of the OS. Any MS product could update
that piece and all MS apps using it would get the new one. So the
version of the MS VM being used was independent of the version of MSIE
being used.

 

[Kent Feiler]

On 26 Jul 2003 02:31:08 -0700, (e-mail address removed) (me) wrote:

Try using APPLET for everybody.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Actually <APPLET> works fine for both ie and mozilla. If your
friends only have microsofts builtin JVM and you are using
suns "javac" to compiler your applet, then you must force
the compiler to produce old java 1.1 compatible class
files, like so:

javac -target 1.1 ... blah blah

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
That did have an effect. The APPLET still doesn't work on IE, but
there's a different and more puzzling error message:

Error: com.ms.SecurityExceptionEX(PlaySound.playnow)
cannot access file /c:/kf/webpage/bin/elephant.au

There's no obvious reason why it wouldn't be able to access the file.
The same HTML file plays on Netscape/Mozilla, and the security is
exactly the same for the HTML file, the AU file, and all the Java
files.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Regards,


Regards,


Kent Feiler
(e-mail address removed)
www.KentFeiler.com

 

[Kent Feiler]

Actually, it was a standard piece of the OS. Any MS product could update
that piece and all MS apps using it would get the new one. So the
version of the MS VM being used was independent of the version of MSIE
being used.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I take it that Netscape/Mozilla would NOT update MSJAVA.DLL. How
about the latest Windows Media Player? Could it be that having people
download the latest WMP might fix the problem even though it wasn't
being used to play the sounds? I'm getting to hate computers...or
maybe it's just Microsoft that I hate.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Regards,


Regards,


Kent Feiler
(e-mail address removed)
www.KentFeiler.com

 

[Tim Tyler]

: On 26 Jul 2003 02:31:08 -0700, (e-mail address removed) (me) wrote:

:>javac -target 1.1 ... blah blah
: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
: That did have an effect. The APPLET still doesn't work on IE, but
: there's a different and more puzzling error message:

: Error: com.ms.SecurityExceptionEX(PlaySound.playnow)
: cannot access file /c:/kf/webpage/bin/elephant.au

: There's no obvious reason why it wouldn't be able to access the file.

How about the fact that is a local file with an absolute path?

: The same HTML file plays on Netscape/Mozilla, and the security is
: exactly the same for the HTML file, the AU file, and all the Java
: files.

I wouldn't bet on the security being the same - given the problem you are
seeing.