Failed to load class "org.slf4j.impl.StaticLoggerBinder"

[Eirik Sletteberg]

"... defaulting to no-operation (NOP) logger implementation."

I'm getting this problem, and can't log any output from my app! (I'm not sure whether that error is the reason, or not)

How to reproduce: Follow this guide: http://www.scalatra.org/getting-started/first-project.html

- g8 scalatra/scalatra-sbt

-  all options default (com.example etc)

- cd my-scalatra-web-app

- sbt

- container:start

(The error appers in the sbt output)

I'm running Windows 7 64 bit. Java version 1.7.0_01-b08.

Anybody else who gets this output?

[Ivan Porto Carrero]

I think you need to add logback-classic to your build.sbt 

---
Met vriendelijke groeten - Best regards - Salutations
Ivan Porto Carrero - Mob: +1 (415) 323-8084
Web: http://flanders.co.nz
Twitter: http://twitter.com/casualjim

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[Eirik Sletteberg]

logback-classic is in there already, by default... (from the g8 generator)

[Ivan Porto Carrero]

Could you gist the entire output of sbt?

[Eirik Sletteberg]

It gets weirder... I believe it might have something to do with sbt.

When I run:

sbt container:start > sbtlog.txt

I get a file (sbtlog.txt) with this content:

[info] Loading global plugins from C:\Users\Eirik\.sbt\0.13\plugins

[info] Loading project definition from D:\workspace\blatest\my-scalatra-web-app\project

[info] Set current project to My Scalatra Web App (in build file:/D:/workspace/blatest/my-scalatra-web-app/)

[info] Generating D:\workspace\blatest\my-scalatra-web-app\target\scala-2.10\resource_managed\main\rebel.xml.

[info] Compiling Templates in Template Directory: D:\workspace\blatest\my-scalatra-web-app\src\main\webapp\WEB-INF\templates

[info] jetty-8.1.8.v20121106

[info] NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet

[info] started o.e.j.w.WebAppContext{/,[file:/D:/workspace/blatest/my-scalatra-web-app/src/main/webapp/]}

[info] started o.e.j.w.WebAppContext{/,[file:/D:/workspace/blatest/my-scalatra-web-app/src/main/webapp/]}

22:46:31.663 [pool-7-thread-1] INFO  o.scalatra.servlet.ScalatraListener - Initializing life cycle class: ScalatraBootstrap

[info] started o.e.j.w.WebAppContext{/,[file:/D:/workspace/blatest/my-scalatra-web-app/src/main/webapp/]}

22:46:31.949 [pool-7-thread-1] INFO  o.f.s.servlet.ServletTemplateEngine - Scalate template engine using working directory: C:\Users\Eirik\AppData\Local\Temp\scalate-6594350449708575862-workdir

[info] Started SelectChann...@0.0.0.0:8080

[success] Total time: 1 s, completed 26.okt.2013 22:46:31

(everything seems fine.)

When I run

sbt container:start

I get this console output:

D:\workspace\blatest\my-scalatra-web-app>sbt container:start

[info] Loading global plugins from C:\Users\Eirik\.sbt\0.13\plugins

[info] Loading project definition from D:\workspace\blatest\my-scalatra-web-app\project

[info] Set current project to My Scalatra Web App (in build file:/D:/workspace/blatest/my-scalatra-web-app/)

[info] Generating D:\workspace\blatest\my-scalatra-web-app\target\scala-2.10\resource_managed\main\rebel.xml.

[info] Compiling Templates in Template Directory: D:\workspace\blatest\my-scalatra-web-app\src\main\webapp\WEB-INF\templates

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

[info] jetty-8.1.8.v20121106

[info] NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet

Null identity service, trying login service: null

Finding identity service: null

[info] started o.e.j.w.WebAppContext{/,[file:/D:/workspace/blatest/my-scalatra-web-app/src/main/webapp/]}

[info] started o.e.j.w.WebAppContext{/,[file:/D:/workspace/blatest/my-scalatra-web-app/src/main/webapp/]}

22:44:55.169 [pool-7-thread-4] INFO  o.scalatra.servlet.ScalatraListener - Initializing life cycle class: ScalatraBootstrap

[info] started o.e.j.w.WebAppContext{/,[file:/D:/workspace/blatest/my-scalatra-web-app/src/main/webapp/]}

22:44:55.449 [pool-7-thread-4] INFO  o.f.s.servlet.ServletTemplateEngine - Scalate template engine using working directory: C:\Users\Eirik\AppData\Local\Temp\scalate-7432287242830895053-workdir

[info] Started SelectChann...@0.0.0.0:8080

[success] Total time: 1 s, completed 26.okt.2013 22:44:55

So the error is not there when I pipe the output to a file.

[Ivan Porto Carrero]

I think you first need to start sbt.  And then in the sbt console do container:start

[Eirik Sletteberg]

I tried it. Gives me the exact same result.

[Matt]

I also get this problem, though my logging works fine afterwards. I noticed that the warn message only appears when I enable pre-compilation of templates. So it seems that whatever is compiling the templates in the template directory is not able to discover the logback library. Any ideas?

[Ivan Porto Carrero]

it's the scalate compiler that looks for a logging library.  IIRC if you want the error to go away depend on a slf4j logger in plugins.sbt  so that one is available on the classpath for sbt stuff. 

---
Met vriendelijke groeten - Best regards - Salutations
Ivan Porto Carrero - Mob: +1 (415) 323-8084
Web: http://flanders.co.nz
Twitter: http://twitter.com/casualjim

For more options, visit https://groups.google.com/d/optout.

[Matt]

Thank you for your help. Unfortunately, I couldn't figure out how to depend on a regular artifact in plugins.sbt

Anyway, since it's only a nuisance but not a deal-breaker, I decided to just ignore it.

[Leif Warner]

You should be able to add a line to your plugins.sbt:

libraryDependencies += "org.slf4j" % "slf4j-nop" % "1.7.10"

[Matt]

Thanks, it seems to work!