如何修复Play 2.3. x启动时“SLF4J：类路径包含多个SLF4J绑定”？

Question

我升级了Play和其他库的版本，现在看到了这个：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/paul/.ivy2/cache/org.slf4j/slf4j-nop/jars/slf4j-nop-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/paul/.ivy2/cache/org.slf4j/slf4j-jdk14/jars/slf4j-jdk14-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/paul/.ivy2/cache/org.slf4j/slf4j-simple/jars/slf4j-simple-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.helpers.NOPLoggerFactory]

我试图追踪这些文件的来源，但当我运行＜code＞show managed classpath

/home/paul/.ivy2/cache/org.slf4j/slf4j-api/jars/slf4j-api-1.7.6.jar
/home/paul/.ivy2/cache/org.slf4j/jul-to-slf4j/jars/jul-to-slf4j-1.7.6.ja
/home/paul/.ivy2/cache/org.slf4j/jcl-over-slf4j/jars/jcl-over-slf4j-1.7.6.jar

我从未见过slf4j-nop-1.7.7.jar或slf4j-jdk14-1.1.7.jar或slf4j-simple-1.6.7.jar。

这些在类路径上怎么样？

Answer 1

根据这些评论和可能的解决方案，我可以建议将我的解决方案包含在< code>build.sbt中，供未修复版本的用户使用，例如Play 2.3.2:

libraryDependencies ++= Seq(
  "org.slf4j" % "slf4j-api"       % "1.7.7",
  "org.slf4j" % "jcl-over-slf4j"  % "1.7.7"
).map(_.force())

libraryDependencies ~= { _.map(_.exclude("org.slf4j", "slf4j-jdk14")) }

之前:

--- (Running the application from SBT, auto-reloading is enabled) ---

[info] play - Listening for HTTP on /0:0:0:0:0:0:0:0:9000

(Server started, use Ctrl+D to stop and go back to the console...)

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/jacek/.ivy2/cache/org.slf4j/slf4j-nop/jars/slf4j-nop-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/jacek/.ivy2/cache/org.slf4j/slf4j-jdk14/jars/slf4j-jdk14-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/jacek/.ivy2/cache/org.slf4j/slf4j-simple/jars/slf4j-simple-1.7.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.helpers.NOPLoggerFactory]
[info] play - Application started (Dev)

之后(变更后):

--- (Running the application from SBT, auto-reloading is enabled) ---

[info] play - Listening for HTTP on /0:0:0:0:0:0:0:0:9000

(Server started, use Ctrl+D to stop and go back to the console...)

[info] play - Application started (Dev)

这些是项目的依赖项：

$show libraryDependencies[info]列表（org.scala.lang:scala库：2.11.2，com.typesafe.play:twirl api:1.0.2，com.typesafe.play：play:2.3.2，com.typesafe.play:play test:2.2.2:test，com.typesafe.play:play docs:2.1.2:docs，com.2，com.typesafe.play:过滤器和助手：2.3.2，org.webjars:webjars play:2.3.0，org.webjars:requirejs:2.1.14-1，org.webjars:UndermarkeJS:1.6.0-3，org.webjars:jquery:2.2.1，org.webjars:bootstrap:3.2.0，org。17，org.postgresql:postgresq:9.3-1102-jdbc41，org.slf4j:slf4japi:1.7.7，org.slf4j:jcl-over-slf4j:1.6.7）