After suffer xml or properties configuration for long time, I'm looking for 
a new configuration solution for Clojure or Java. I hope below features, 
priority from high to low:

1. readable format and easy to write. XML is the opposite example, which is 
not easy to edit and not readable. I like Json or YAML, especially JSON. 
2. support difference environments. The difficult things I have are 
distributes difference package for difference environments (dev, gamma or 
online). My practice are write difference set of configuration files for 
each environment, for example we have database-dev.properties and 
database-online.properties for respectively dev and online environment, 
then pass a argument to startup script to control which file to load. it's 
just work, but the problem are there are only small part of config is 
difference between and dev and online, but I have to rewrite and maintain 
all config in two files.
3. easy to organize if there are a lot of configuration files. It's very 
common that there are many configurations distributes in difference files. 
Sometimes one file's configuration need override another. we need a 
solution to management them.
4. we can very easy override configuration by CLI argument or system 
environment variable. Sometimes we have to temporarily change configuration 
for debug or troubleshooting purpose. I hope we can easy to override 
configuration not change the configuration files.

For the #1, the HOCON ( https://github.com/typesafehub/config ) is the best 
config syntax what I have ever seen. But I didn't find out a solution which 
can satisfy rest of other features. Do you have any suggestions? thanks

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