jPost Applet does not work with Sun JVM

[Diana]

Hello,

I've got what I believe is a unique problem. I have a jsp based
application which shuttles data back and forth between the server and
client using a jPost applet (http://java.sun.com/openstudio/jpost/).
Basically, javascript functions send Strings, ints and booleans to the
applet which then passes them to the server. This allows state to be
maintained on the server without constantly flashing the page.

Here's the issue: my company was using IE 6 with the Microsoft JVM.
This worked like a charm. However, we're switching to the latest Sun
JVM and suddenly I've got corrupted data and major performance issues.
It appears to me that there are threading issues here, as the data
from multiple responses seems to get mixed together.

I've attempted to resolve this by synchronizing all methods in my
applet and the code that it calls on the server, but this did nothing.
If I try to hack in synchronization to the javascript it degrades
performance to the point that the browser won't even run it.

I'm at a bit of a loss, if anyone can help I'd be so thankful!

 

[Roedy Green]

I've attempted to resolve this by synchronizing all methods in my
applet and the code that it calls on the server, but this did nothing.
If I try to hack in synchronization to the javascript it degrades
performance to the point that the browser won't even run it.

You have two separate streams. You really should be talking on two
separate sockets. Perhaps this has something to do with keep open
being made a default.

 

[Diana]

Hark! I have found the answer. There is a bug in all Sun JVMs from
versions 1.3.1.04 on which causes the applet methods to run
asynchronously when called from Javascript. This problem is documented
on Sun's website at:

http://developer.java.sun.com/developer/bugParade/bugs/4838960.html

I simply replaced version 1.4.2 with 1.3.1, and my code works
perfectly again.

Thanks!

Diana