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The default values of system properties are set by the JVM upon startup and can be considered trusted. However, they may be overridden by properties from untrusted sources, such as a configuration file. Properties from untrusted sources must be sanitized and validated before use.
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_The Java Tutorial_ \[[Campione 1996|AA. Bibliography#Campione 96]\] 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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