How to Build Better Application Libaray

When we build library that will be used by many other projects(either internally or externally), we should think about how client will use it, build sample application, talk with client team: what they want us to improve, make the library easier for client team to use.

Examples
Build Common Authentication Library
For example, if we are building a common authentication library, we should package all configuration file(or Java Configuration classes), properties files in the library, also allow the client to overwrite the existing properties files.

The sensitive information(such as db password, aws key etc - at least for production) should be encrypted, and only the manager or operation team should know the encryption key.
Check How to Encrypt Properties in Spring Apllication

It should provide readme file about how to import it(when import it, whether need exclude some dependencies etc), what kind of properties client can overwrite etc.

The client only need import it, change some properties if needed, the application should just work.

Evolve the Library
The library should evolve, it may be developed with old versions such as Spring 3, Jersey 1, codehause Jackson, but over time, it should evolve to newer version Spring 4, Jersey 2, fasterxml Jackson. 

It may build different branch: old branch with old libraries, new branch with new libraries, client can choose when to upgrade to newer version.
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