I think you're confusing compile-time with run-time. A try-catch
wouldn't affect the compiler. Perhaps you actually have
commons-logging in your classpath? It's pulled in by many libraries.
Or you forgot to remove the quote in addition to removing the eval in
your testing.
Here's the code that fails to compile. All I did was remove eval and
the quote around the 'do'.
(ns testclj.core)
(defn cl-factory
"Returns a Commons Logging-based implementation of the LoggerFactory
protocol, or
nil if not available."
[]
(try
(Class/forName "org.apache.commons.logging.Log")
(do
(extend org.apache.commons.logging.Log
Logger
{:enabled?
(fn [logger# level#]
(condp = level#
:trace (.isTraceEnabled logger#)
:debug (.isDebugEnabled logger#)
:info (.isInfoEnabled logger#)
:warn (.isWarnEnabled logger#)
:error (.isErrorEnabled logger#)
:fatal (.isFatalEnabled logger#)
(throw (IllegalArgumentException. (str level#)))))
:write!
(fn [logger# level# e# msg#]
(if e#
(condp = level#
:trace (.trace logger# msg# e#)
:debug (.debug logger# msg# e#)
:info (.info logger# msg# e#)
:warn (.warn logger# msg# e#)
:error (.error logger# msg# e#)
:fatal (.fatal logger# msg# e#)
(throw (IllegalArgumentException. (str level#))))
(condp = level#
:trace (.trace logger# msg#)
:debug (.debug logger# msg#)
:info (.info logger# msg#)
:warn (.warn logger# msg#)
:error (.error logger# msg#)
:fatal (.fatal logger# msg#)
(throw (IllegalArgumentException. (str
level#))))))})
(reify LoggerFactory
(name [_#]
"org.apache.commons.logging")
(get-logger [_# logger-ns#]
(org.apache.commons.logging.LogFactory/getLog (str logger-
ns#)))))
(catch Exception e nil)))
On Tue, Nov 22, 2011 at 1:34 PM, vitalyper <vitaly...@yahoo.com> wrote:
> Gary,
>
> You are probably removing try/catch as well. ClassNonFoundException is
> expected and silenced with catch.
>
> (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)))
>
> On Nov 18, 5:16 pm, Gary Trakhman <gary.trakh...@gmail.com> wrote:
>> I get this when i try it in a blank project, removing the eval and the
>> quote:
>>
>> Unknown location:
>> error: java.lang.ClassNotFoundException: org.apache.commons.logging.Log
>>
>> core.clj:16:8:
>> error: java.lang.ClassNotFoundException: org.apache.commons.logging.Log
>> (core.clj:16)
>>
>> Compilation failed.
>
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