How to structure my package hierarchy?

As an inexperienced Java programmer, I am having a hard time understanding how to structure packages hierarchically.
Let's say that I am developing a client/server AddressBook application. So automatically, the following package hierarchy comes to my mind:
(company/org name is ACME for example)
com.acme.addressbook
com.acme.addressbook.protocol
The above two packages form the reusable core of the AddressBook system and include classes such as AddressBook, AddressBookEntry, etc. and related helper classes. Additionally, the protocol sub-package contains classes that pertain to the C/S network protocol. And both of these two packages are packaged up in a jar: AcmeAddressbook.jar
com.acme.addressbook.client
The above is the package for the Client application: AcmeAddressBookClient.jar
com.acme.addressbook.server
The above is the package for the Server application: AcmeAddressBookServer.jar
My questions are: does such a package structure and hierarchy make sense? Or are there any glaring mistakes that I have made?
Is it acceptable to keep the client and server applications into their own separate packages?
Also, is there any recommended limit for nested packages i.e. how deep should packages be nested within the top-level AddressBook package?
I am struggling to understand good package design and package structuring conventions.
Thanks any for any info, critique, advice, etc.

Lets the two client and server packages are respectively :
com.acme.addressbook.client
com.acme.addressbook.server
Yes, such a package structure and hierarchy make sense!
If you are having common utility classes and many library jars inside the package addressbook.library, you can just refer in client as well as in the server package.
If you are going to create separate project for client and for server, you want to maintain multiple copies, which further results in the problems due to redundant code. ie., whenever you changed any library files, you want to update in both places.
You can create two jars as you mentioned as,
AcmeAddressBookClient.jar
AcmeAddressBookServer.jar
Before building jars you just want to set the executable Main class appropriate for Client and Server before making the client and server jars respectively.
There is no limit for the nested package, if you need to group meaningfully, you can make as many nested package as you want!
For your reference :
http://articles.techrepublic.com.com/5100-22-1046677.html

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