Why using big JARs when single components could be distributed

We are facing a problem with our Java application distribution, since the software house sends us large JARs (around 10Mb) which must be deploy to our branches at around 64Kbauds, taking at least an hour for each one. When we look at the changes, only a few 100Kb where changed (only 10 or 20 Java routines) from one version to the other of the applications.
Is there any way to avoid this Java JARs and send and deploy only the changes. I know that certain distribution products let you take notice of this differences and package only the delta, but I don't have the knowledge to make our software provider to make him change their mind on the issue. Does anybody know the answer?
Thanks in advance.

BEA uses a trick which appears to work for packaging updated class files. If the classes signature (methods, parameters etc) are the same, you can take the new class files which have changed and package them in a new jar file. Then place the new jar on the classpath when starting the application, but make sure it appears before the original applications jar.
For example say I have app.jar, and normally start it with
java - classpath ./app.jar my.MainClass.
If I update the myClass.class file, I would package the class in a jar called new.jar and start the app with
java -classpath ./new.jar:./app.jar my.MainClass.
When Javas classloader searches for a class to load, if there are two, it always takes the first one it finds.

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