I have not used this example you mention, however I have experienced a similar exception before.
It would seem that you have an incompatibility with the binding you are using and SLF4J. You will need to download a newer version from the SLF4J website and have it available as a resource for your job. Each of the bindings are available in a JAR format, and serve to abstract you from the complexities of the underlying log implementation. -Tyson On Apr 18, 2012 12:22 AM, "Devadas Mallya" <mallya.deva...@gmail.com> wrote: > Hi, > I am trying to run the RecommenderJob Map/Reduce class. > > However I get an error saying SLF4J is incompatible with this binding. > > The command I am using is: > > bin/hadoop jar mahout-core-0.7-SNAPSHOT-job > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob > -Dmapred.input.dir=/user/input/ratingsLess.txt > -Dmapred.output.dir=/user/input/output --usersFile input/users.txt > --numRecommendations 5 -s SIMILARITY_TANIMOTOCOEFFICIENT > > The error is: > > SLF4J: slf4j-api 1.6.x (or later) is incompatible with this binding. > SLF4J: Your binding is version 1.5.5 or earlier. > SLF4J: Upgrade your binding to version 1.6.x. or 2.0.x > Exception in thread "main" java.lang.NoSuchMethodError: > > org.slf4j.impl.StaticLoggerBinder.getSingleton()Lorg/slf4j/impl/StaticLoggerBinder; > at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121) > at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111) > at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:268) > at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:241) > at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:254) > at org.apache.mahout.common.AbstractJob.<clinit>(AbstractJob.java:88) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:247) > at org.apache.hadoop.util.RunJar.main(RunJar.java:149) > > > Please let me know what I'm missing. > > Thanks. > > Dev. >
