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File entry in Scala / akka: ClassNotFoundException: akka.event.slf4j.Slf4jLoggingFilter

I searched quite a lot, but did not find a working solution. Can someone please help me?

akka { event-handlers = ["akka.event.slf4j.Slf4jEventHandler"] loggers = ["akka.event.slf4j.Slf4jLogger"] loglevel = "DEBUG" logging-filter = "akka.event.slf4j.Slf4jLoggingFilter" stdout-loglevel = "WARNING" actor { debug { receive = on lifecycle = off } } }

and I added the following to build.sbt in the hope that one of them solves the problem:

 libraryDependencies ++= Seq ( "com.typesafe.akka" %% "akka-actor" % "2.4.1", // akka actors "ch.qos.logback" % "logback-classic" % "1.1.3", //logback, in order to log to file "com.typesafe.scala-logging" % "scala-logging-slf4j_2.11" % "2.1.2", "com.typesafe.akka" % "akka-slf4j_2.11" % "2.4.1", // needed for logback to work // and my other dependencies )

and I tried with various sentences that I found for logback.xml , the last of which:

 <configuration> <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>logs/filename.log</file> <encoder> <pattern>%date %level %msg%n</pattern> </encoder> <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"> <maxIndex>10</maxIndex> <FileNamePattern>logs/filename.log.%i.gz</FileNamePattern> </rollingPolicy> <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"> <maxFileSize>20MB</maxFileSize> </triggeringPolicy> </appender> <root level="info"> <appender-ref ref="FILE" /> </root> </configuration>

EDIT: My full dependencies are as follows (ps: I currently have both lift and salat for de / serialization, but that's a different story):

 libraryDependencies ++= Seq ( "org.scala-lang" % "scalap" % scalaVersion.value, "com.typesafe.akka" %% "akka-actor" % "2.4.1", "ch.qos.logback" % "logback-classic" % "1.1.3", "com.typesafe.scala-logging" % "scala-logging-slf4j_2.11" % "2.1.2", "com.typesafe.akka" %% "akka-slf4j" % "2.4.1", "com.github.sstone" %% "amqp-client" % "1.5", "net.liftweb" %% "lift-json" % "2.6.2", "net.liftweb" %% "lift-json-ext" % "2.6.2", "org.scalatest" %% "scalatest" % "2.2.4" % "test", "com.novus" %% "salat" % "1.9.9" )
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3 answers

So you use "com.novus" %% "salat" % "1.9.9" , which depends on salat-util % 1.9.9 , which depends on org.slf4j % slf4j-api % 1.7.2 . Akka "com.typesafe.akka" %% "akka-slf4j" % "2.4.1" depends on 1.7.12. Make sure you need the whole salat package. You could probably find a way to use only part of it, or set up logging differently, or wait for updates from Salat developers.

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The best way to solve these problems is to always see the dependency tree and find out what happens there (very important is maven or sbt )

See how many slf4j dependencies you have. (I see conflicting dependencies slf4j-api:1.6.0 , slf4j-api:1.7.2 , slf4j-api:1.7.12 )

 sbt dependencyTree [info] +-com.novus:salat_2.11:1.9.9 [S] [info] | +-com.novus:salat-core_2.11:1.9.9 [S] [info] | | +-com.novus:salat-util_2.11:1.9.9 [S] [info] | | | +-org.scala-lang:scalap:2.11.5 [info] | | | | +-org.scala-lang:scala-compiler:2.11.5 [S] [info] | | | | +-org.scala-lang.modules:scala-parser-combinators_2.11:1.0.1 (evicted by: 1.0.3) [info] | | | | +-org.scala-lang.modules:scala-parser-combinators_2.11:1.0.3 [S] [info] | | | | +-org.scala-lang.modules:scala-xml_2.11:1.0.1 (evicted by: 1.0.3) [info] | | | | +-org.scala-lang.modules:scala-xml_2.11:1.0.3 [S] [info] | | | | +-org.scala-lang:scala-reflect:2.11.5 [S] [info] | | | | [info] | | | +-org.slf4j:slf4j-api:1.6.0 (evicted by: 1.7.12) [info] | | | +-org.slf4j:slf4j-api:1.7.12 [info] | | | +-org.slf4j:slf4j-api:1.7.2 (evicted by: 1.7.12) [info] +-ch.qos.logback:logback-classic:1.1.3 [info] | +-ch.qos.logback:logback-core:1.1.3 [info] | +-org.slf4j:slf4j-api:1.7.12 [info] | +-org.slf4j:slf4j-api:1.7.7 (evicted by: 1.7.12) [info] | | +-org.mongodb:casbah-core_2.11:2.7.1 [S] [info] | | +-com.github.nscala-time:nscala-time_2.11:1.0.0 [S] [info] | | | +-joda-time:joda-time:2.3 [info] | | | +-org.joda:joda-convert:1.2 [info] | | | [info] | | +-org.mongodb:casbah-commons_2.11:2.7.1 [S] [info] | | | +-com.github.nscala-time:nscala-time_2.11:1.0.0 [S] [info] | | | | +-joda-time:joda-time:2.3 [info] | | | | +-org.joda:joda-convert:1.2 [info] | | | | [info] | | | +-org.mongodb:mongo-java-driver:2.12.1 [info] | | | +-org.slf4j:slf4j-api:1.6.0 (evicted by: 1.7.12) [info] | | | +-org.slf4j:slf4j-api:1.7.12 [info] | | | [info] | | +-org.mongodb:casbah-query_2.11:2.7.1 [S] [info] | | | +-com.github.nscala-time:nscala-time_2.11:1.0.0 [S] [info] | | | | +-joda-time:joda-time:2.3 [info] | | | | +-org.joda:joda-convert:1.2 [info] | | | | [info] | | | +-org.mongodb:casbah-commons_2.11:2.7.1 [S] [info] | | | | +-com.github.nscala-time:nscala-time_2.11:1.0.0 [S] [info] | | | | | +-joda-time:joda-time:2.3 [info] | | | | | +-org.joda:joda-convert:1.2 [info] | | | | | [info] | | | | +-org.mongodb:mongo-java-driver:2.12.1 [info] | | | | +-org.slf4j:slf4j-api:1.6.0 (evicted by: 1.7.12) [info] | | | | +-org.slf4j:slf4j-api:1.7.12 [info] | | | | [info] | | | +-org.slf4j:slf4j-api:1.6.0 (evicted by: 1.7.12) [info] | | | +-org.slf4j:slf4j-api:1.7.12 [info] | | | [info] | | +-org.slf4j:slf4j-api:1.6.0 (evicted by: 1.7.12) [info] | | +-org.slf4j:slf4j-api:1.7.12 [info] | +-com.novus:salat-util_2.11:1.9.9 [S] [info] | +-org.scala-lang:scalap:2.11.5 [info] | | +-org.scala-lang:scala-compiler:2.11.5 [S] [info] | | +-org.scala-lang.modules:scala-parser-combinators_2.11:1.0.1 (evicted by: 1.0.3) [info] | | +-org.scala-lang.modules:scala-parser-combinators_2.11:1.0.3 [S] [info] | | +-org.scala-lang.modules:scala-xml_2.11:1.0.1 (evicted by: 1.0.3) [info] | | +-org.scala-lang.modules:scala-xml_2.11:1.0.3 [S] [info] | | +-org.scala-lang:scala-reflect:2.11.5 [S] [info] | | [info] | +-org.slf4j:slf4j-api:1.6.0 (evicted by: 1.7.12) [info] | +-org.slf4j:slf4j-api:1.7.12 [info] | +-org.slf4j:slf4j-api:1.7.2 (evicted by: 1.7.12) [info] +-com.typesafe.scala-logging:scala-logging-slf4j_2.11:2.1.2 [S] [info] | +-com.typesafe.scala-logging:scala-logging-api_2.11:2.1.2 [S] [info] | +-org.scala-lang:scala-reflect:2.11.5 [S] [info] | +-org.slf4j:slf4j-api:1.7.12 [info] | +-org.slf4j:slf4j-api:1.7.7 (evicted by: 1.7.12) [info] +-net.liftweb:lift-json-ext_2.11:2.6.2 [S] [info] | +-commons-codec:commons-codec:1.6 [info] | +-joda-time:joda-time:2.1 (evicted by: 2.3) [info] | +-joda-time:joda-time:2.3 [info] | +-net.liftweb:lift-common_2.11:2.6.2 [S] [info] | | +-org.scala-lang.modules:scala-parser-combinators_2.11:1.0.1 (evicted by: 1.0.3) [info] | | +-org.scala-lang.modules:scala-parser-combinators_2.11:1.0.3 [S] [info] | | +-org.scala-lang.modules:scala-xml_2.11:1.0.1 (evicted by: 1.0.3) [info] | | +-org.scala-lang.modules:scala-xml_2.11:1.0.3 [S] [info] | | +-org.slf4j:slf4j-api:1.6.0 (evicted by: 1.7.12) [info] | | +-org.slf4j:slf4j-api:1.7.12 [info] | | +-org.slf4j:slf4j-api:1.7.2 (evicted by: 1.7.12)

And to find out which version is used,

 $ sbt dependencyList [info] org.slf4j:slf4j-api:1.7.12

This way you can control which version you want and which you want to exclude,

eg. to exclude the version of slf4j-api that salat uses

 "com.novus" %% "salat" % "1.9.9" exclude("org.slf4j","slf4j-api")

Note

add addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.8.2") to project/plugins.sbt to use sbt dependencyTree .

https://github.com/jrudolph/sbt-dependency-graph#usage-instructions

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@Mahdi: Not sure if you could solve your problem, but I ran into the same problem and realized that the correct version of "com.typesafe.akka" %% "akka-slf4j" % "2.4.0", not included to my build.sbt file.

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Source: https://habr.com/ru/post/1237573/

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