-The buildpack default configuration can be overridden with an environment variable matching the configuration file you wish to override minus the `.yml` extension and with a prefix of `JBP_CONFIG`. It is not possible to add new configuration properties and properties with `nil` or empty values will be ignored by the buildpack (in this case you will have to extend the buildpack, see below). The value of the variable should be valid inline yaml, referred to as "flow style" in the yaml spec ([Wikipedia][] has a good description of this yaml syntax). For example, to change the default version of Java to 7 and adjust the memory heuristics apply this environment variable to the application.
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