Silent upgrade

I'm developing a java application that is supposed to run on some workstations. This application  has a Derby database. Also I have a web server too. The application is supposed to communicate with the web server.
This application will run in customers' environment so I was looking for a solution to implement the silent upgrade for this application. Because the customer's staff are not familiar with IT and we don't have enough resource to do it ourselves.
What I thought is this:
1. The application call the web server periodicly for updates.
2.If an upgrade was available:
      2-1:the application gets the upgrade sql and run it on it's own database.
      2-2. the application gets new jar files/class files from web server and reload the classes dynamicly.
I prefer not to use any third party framework for reloading jar files or classes and use just pure java internal APIs.
If anybody has a experience in this issue, I really appreciate his/her help.
amirmbAsked:
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amirmbConnect With a Mentor Author Commented:
I decided to develop a parent service just for upgrade reasons. this parent service(program) will be installed in client machine but jt would just install updates.
This parent will start the main application. and then whenever there is a new update, the main application will get it(the jar and sql files) and then exit. the parent service will install the updates and start the child service(main application) again.
I don't have a jar file reloading or class loading problems in this solution because the main application would be restarted after update every time (with new jars).
I'm pretty sure that it will work quite well.
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CEHJConnect With a Mentor Commented:
You should probably use Java Web Start. In theory, updates to the app will be transparent to the user
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objectsCommented:
> updates to the app will be transparent to the user

jws does not support that
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HegemonConnect With a Mentor Commented:
If you use jws, it will upgrade the application itself, then it will need to check whether a database upgrade is required by contacting the server.
If you don't then p 2-2 is about the same + additional burden of implementing it + reloading the classes.

I'd opt for jws to update the application itself, with the database upgrade logic (2-1) programmed in the application.
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objectsConnect With a Mentor Commented:
be aware jws has issues with versioning, and it doesn't handle class reloading
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amirmbAuthor Commented:
Thanks for your comments.
 But you know, my application must run silent and as a service in the client machine. So there isn't any browser and any end user. So I can't use JWS.
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amirmbAuthor Commented:
The solution I provided for the problem is simple and practical.
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