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Editorial Team
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Asked: 2026-05-14T15:26:29+00:00

Using clojure, I’ve been able to successfully setup log4j very simply by using this

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Using clojure, I’ve been able to successfully setup log4j very simply by using this log4j.properties file, and including log4j in my classpath.

# BEGIN log4j.properties

log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender
log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout
log4j.appender.STDOUT.layout.ConversionPattern=%d{MMdd HHmmss SSS} %5p %c [%t] %m\n

log4j.rootLogger=DEBUG, STDOUT

Then after :use’ing clojure.contrib.logging, I’m able to print a statement with the desired formatting as expected like so:

(info "About to print this")
(debug "This is debug-level")

My question is how to achieve a consistent formatting for logging statements made from loggers configured in other libraries. I thought I could find existing loggers using org.apache.log4j.LogManager.getCurrentLoggers() and change the PatternLayouts there, but I’m not able to iterate over that enumeration in clojure, as I get the following error:

Dont know how to create ISeq from: java.util.Vector$1

I assume this is possible somehow, and probably very simply. How?

Thanks much.

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1 Answer

  1. Editorial Team

    Use enumeration-seq instead of seq:

    (enumeration-seq (org.apache.log4j.LogManager/getCurrentLoggers))

    For the curious, org.apache.log4j.LogManager.getCurrentLoggers() returns a java.util.Enumeration; seq doesn’t know how to operate on that, but enumeration-seq does.

    A simpler case not involving logging:

    (seq (.elements (java.util.Vector. [1 2 3]))
; => throws an exception

(enumeration-seq (.elements (java.util.Vector. [1 2 3])))
; => returns (1 2 3)
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