记录到 Scala/akka 中的文件：ClassNotFoundException：akka.event.slf4j.Slf4jLoggingFilter

Question

我搜索了很多，但找不到可行的解决方案。有人可以帮我吗？

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
       }
     }
}

我已将以下内容添加到 build.sbt，希望其中之一能解决问题：

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
)

我已经尝试了为 logback.xml 找到的不同建议，最后一个是：

<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>

编辑：我的完整依赖项如下（ps：对于 de/serialization，我目前同时拥有 lift 和 salat，但这是另一回事）：

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"
)

Answer 1

因此您使用 "com.novus" %% "salat" % "1.9.9" 取决于 salat-util % 1.9.9，而 depends on org.slf4j % slf4j-api % 1.7.2. Akka "com.typesafe.akka" %% "akka-slf4j" % "2.4.1" depends 取决于 1.7.12。确保您需要整个 salat 包。也许你可以找到一种只使用其中一部分的方法，或者以不同的方式配置日志记录，或者等待 Salat 开发人员的更新。

Answer 2

@Mahdi：不确定你是否能够解决你的问题，但我遇到了同样的问题并且发现正确的版本 "com.typesafe.akka" %% "akka-slf4j" % "2.4.0", 未包含在我的 build.sbt 中。

Answer 3

解决此类问题的最佳方法始终是查看依赖关系树并弄清楚那里发生了什么，（这非常重要，无论是maven还是sbt)

查看您有多少 slf4j 依赖项。（我可以看到相互冲突的依赖项 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)

要知道使用的是什么版本，

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

这样你就可以控制你想要的版本和你想要排除的版本，

例如。排除 salat 使用

的 slf4j-api 版本

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

备注

将 addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.8.2") 添加到 project/plugins.sbt 以使用 sbt dependencyTree。

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

记录到 Scala/akka 中的文件：ClassNotFoundException：akka.event.slf4j.Slf4jLoggingFilter

Logging to file in Scala/akka: ClassNotFoundException: akka.event.slf4j.Slf4jLoggingFilter

logging

scala

logback

akka

备注