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Both environment variables and system properties provide user-defined mappings between keys and their corresponding values and can be used to communicate those values from the environment to a process. According to the Java API \[[API 2006|AA. Bibliography#APIReferences#API 06]\] {{java.lang.System}} class documentation:

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_The Java Tutorial_ \[[Campione 1996|AA. Bibliography#CampioneReferences#Campione 96]\] states:

To maximize portability, never refer to an environment variable when the same value is available in a system property. For example, if the operating system provides a user name, it will always be available in the system property user.name.

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[[API 2006

AA. Bibliography#API References#API 06]]

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[[Campione 1996

AA. Bibliography#Campione References#Campione 96]]

 

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