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From Adrian Mocanu <amoc...@verticalscope.com>
Subject slf4j and log4j loop
Date Fri, 14 Mar 2014 20:04:30 GMT
Hi
Have you encountered a slf4j and log4j loop when using Spark? I pull a few packages via sbt.
Spark package uses slf4j-log4j12.jar and another package uses use log4j-over-slf4j.jar which
creates the circular loop between the 2 loggers and thus the exception below. Do you know
of a fix for this?


SLF4J: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting
StackOverflowError.
SLF4J: See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
An exception or error caused a run to abort.
java.lang.ExceptionInInitializerError
                at org.apache.log4j.Logger.getLogger(Logger.java:40)
                at org.apache.spark.util.AkkaUtils$.createActorSystem(AkkaUtils.scala:58)
                at org.apache.spark.SparkEnv$.create(SparkEnv.scala:126)
                at org.apache.spark.SparkContext.<init>(SparkContext.scala:139)
                at org.apache.spark.streaming.StreamingContext$.createNewSparkContext(StreamingContext.scala:500)
                at org.apache.spark.streaming.StreamingContext.<init>(StreamingContext.scala:76)
                ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...
Caused by: java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar
on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop
for more details.
                at org.apache.log4j.Log4jLoggerFactory.<clinit>(Log4jLoggerFactory.java:51)
                ... 54 more


Thanks
-Adrian


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