Create a executable patch for upgrading my application

[Hosein masbough]

I want to create a executable jar patch for my desktop application and give it to my clients for updating the previous version of application.

I do not want the existing application on client systems is removed manualy and then installed the new version.

The new version has the following changes:

1- Some tables of database has changed.(new columns, new tables)
2- Some new libraries were added to Classpath of the application.
3- Some new classes were added.

How can i make an executable jar file for upgrading my application to new version?

Thanks.

[Jeanne Boyarsky]

What kind of database are you using? The answer to this will determine whether it is feasible to do this upgrade in Java.

Also, how did you install the application on their machine in the first place? Were you able to do that in Java?

[Hosein masbough]

Excuse me for delay in responsing.
My database is Postgresql.
I installed the project with setup file and copied the jar files to their places in installing operation.