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No Log4J output in sbt when using scalatest

I use Log4J to log in to SBT. In the configuration file, I defined the level TRACEfor the root node. When I run the project ( sbt run), all debug output is displayed correctly. But when I run the tests ( sbt test), no output is generated at all. I need to insert a class into the configuration in order to see the result.

The test is written in the style of JUnit. Running tests with Eclipse shows all Log4J output. So this is a problem with SBT or scalatest.

Log4J Configuration:

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration debug="false" xmlns:log4j="http://jakarta.apache.org/log4j/">

  <appender name="stdout" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.EnhancedPatternLayout">
      <param name="ConversionPattern" value="%-5r [%-5p] %c: %M - %m%n"/>
    </layout>
  </appender>

  <appender name="asyncApp" class="org.apache.log4j.AsyncAppender">
    <appender-ref ref="fileApp"/>
  </appender>

  <appender name="fileApp" class="org.apache.log4j.FileAppender">
    <param name="File" value="testlog_Compiler"/>
    <param name="Append" value="true" />
    <param name="Threshold" value="ALL"/>
    <layout class="org.apache.log4j.EnhancedPatternLayout">
      <param name="ConversionPattern" value="%d [%-5p] %c: %M - %m%n"/>
    </layout>
  </appender>

  <appender name="fileAppTest" class="org.apache.log4j.FileAppender">
    <param name="File" value="testlog_Tests"/>
    <param name="Append" value="true" />
    <param name="Threshold" value="ALL"/>
    <layout class="org.apache.log4j.EnhancedPatternLayout">
      <param name="ConversionPattern" value="%d [%-5p] %c: %M - %m%n"/>
    </layout>
  </appender>

  <logger name="main.Main$" additivity="true">
    <level value="INFO" /> 
  </logger>
<!--
  <logger name="compile.Compiler" additivity="true">
    <level value="DEBUG" />
  </logger>
-->
  <logger name="test" additivity="false">
    <level value="TRACE" />
    <appender-ref ref="stdout"/>
    <appender-ref ref="fileAppTest"/>
  </logger>

  <root>
    <priority value="TRACE"/>
    <appender-ref ref="asyncApp"/>
    <appender-ref ref="stdout"/>
  </root>

</log4j:configuration>

, compile.Compiler , node Log4J. SBT compile.Compiler: ( .)

class Comp2011ParentProject(info: ProjectInfo) extends DefaultProject(info) {
    val compiler = project("compile", "compile", new Compile(_))
    class compiler(info: ProjectInfo) extends DefaultProject(info) with Eclipsify {
        val scalatest = "org.scalatest" % "scalatest_2.9.0" % "1.6.1"
        val junitInterface = "com.novocode" % "junit-interface" % "0.6" % "test->default"
        val log4j = "log4j" % "log4j" % "1.2.16"
        val log4jExtras = "log4j" % "apache-log4j-extras" % "1.1"
    }
}

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