What is the best way to manage configuration data

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Using commons-configuration you have a unified API for accessing the properties, no matter how they are represented – .properties, xml, JNDI, etc. For example:

config.properties:

jdbcHost=192.168.12.35
jdbcUsername=dbuser
jdbcPassword=pass

config.xml:

<config>
   <jdbcHost>192.168.12.35</jdbcHost>
   <jdbcUsername>dbuser</jdbcUsername>
   <jdbcPassword>pass</jdbcPassword>
</config>

in both cases they will be accessible with something like:

String host = config.getString("jdbcHost");

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