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.
Exception in thread "main" java.lang.ExceptionInInitializerError
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at 
org.slf4j.impl.Log4jLoggerFactory.<clinit>(Log4jLoggerFactory.java:48)
    at org.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:72)
    at 
org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:45)
    at 
org.apache.spark.internal.Logging$class.initializeLogging(Logging.scala:111)
    at 
org.apache.spark.internal.Logging$class.initializeLogIfNecessary(Logging.scala:102)
    at 
org.apache.spark.SparkContext.initializeLogIfNecessary(SparkContext.scala:73)
    at org.apache.spark.internal.Logging$class.log(Logging.scala:46)
    at org.apache.spark.SparkContext.log(SparkContext.scala:73)
    at org.apache.spark.internal.Logging$class.logInfo(Logging.scala:54)
    at org.apache.spark.SparkContext.logInfo(SparkContext.scala:73)
    at org.apache.spark.SparkContext.<init>(SparkContext.scala:184)
    at 
org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:58)
    at testerconn.ection.App.main(App.java:28)
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)
    ... 15 more

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