Also I think this line doesn't actually do anything:  (Class/forName 
"foo.bar")

It will effectively just ask the classloader to load the class.  You 
removed more than the eval in your referenced code, you removed the code 
that did anything.   That code needs to be there.  It's eval'd because it's 
not guaranteed to be compilable for projects without commons-logging in 
their classpath.

(defn cl-factory
  "Returns a Commons Logging-based implementation of the
LoggerFactory
protocol, or
  nil if not available."
  []
  (try
    (Class/forName "foo.bar")
    ; eval removed
    (catch Exception e nil)))



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