First, create another namespace to set the parameter in:
(ns duracell.strap)
(defn jetty-init [] (.put (System/getProperties) "org.eclipse.jetty.servlet.Default.useFileMappedBuffer" "false") )
Then add :init to serve in build.boot:
(serve :port 8000 :init 'duracell.strap/jetty-init)
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