Product/Package vendor/version specification query

Greetings,
I am new to using Java for serious apps and need to know how I put information such as vendor, version, build, author and suchlike into a package or class so that it can be read and used to identify the component at runtime.
I've seen something about the Packge holding this info but only in that it is put into the .jar which is not what I actually want.
I need the information written into the .java source file which will be automatically adjusted by the version control system, and I want to be able to identify uniquely each package.
I tried to find the right 'magic' words to search to no avail so I would be very grateful if this could be cleared up.
Many thanks in advance.

Firstly, many thanks for your responses.
The manifest from what I have determined stores for that .jar but it is not clear what happens if you have more than one package. Also this means that the information is seperate from the .java source files since if I understand correctly the manifest is not actually a .java file and is just an info file given to the tool when the .jar is built.
On the getResource idea - hmmm not sure how that will help another application or O/S pick up and interrogate a file held in a folder.
When setting a version/vendor etc info in VB/VC++ this info which can be set programmatically, can be recalled by getting the properties of the .exe file. Thus it is also possible for another program to get the information without creating a live instance of the program in order to interrogate it.
I have seen that the Package class refers to members such as:
getImplementationTitle()
getImplementationVendor()
and such like.
This appears to be what I need apart from there are no setters mention nor is there an example of how one programmatically sets such information. I am not even sure how to 'use' the Package class
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Package.html
Thanks for whatever clarification/assistance you can give in advance.

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