How does the condition functionality work in Logback?

logback janino
theomega picture theomega · Jun 13, 2012 · Viewed 16.7k times · Source

I use this logback configuration file:

<configuration>
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} [%-10.-10thread] %-5level %-30logger{1} - %msg%n</pattern>
    </encoder>
  </appender>

<if condition='isDefined("fileout-dir")'><then>
  <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">
     <discriminator  class="edu.kit.sdq.storagebenchmarkharness.logging.SBHThreadDiscriminator"/>
    <sift>
      <appender name="FILE-${thread}" class="ch.qos.logback.core.FileAppender">
        <file>${fileout-dir:-}${thread}.log</file>
        <append>true</append>
        <layout class="ch.qos.logback.classic.PatternLayout">
          <pattern>%d{HH:mm:ss.SSS} %-5level %-30logger{1} - %msg%n</pattern>
        </layout>
      </appender>
    </sift>
  </appender>
  <root>
    <appender-ref>SIFT</appender-ref>
  </root>
 </then> </if>

  <root level="debug">
    <appender-ref ref="STDOUT" />
  </root>
</configuration>

When running my application, I get the following error:

org.codehaus.commons.compiler.CompileException: Line 1, Column 45: A method named "isDefined" is not declared in any enclosing class nor any supertype, nor through a static import
    at org.codehaus.commons.compiler.CompileException: Line 1, Column 45: A method named "isDefined" is not declared in any enclosing class nor any supertype, nor through a static import
    at  at org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:9014)
    at  at org.codehaus.janino.UnitCompiler.findIMethod(UnitCompiler.java:6549)
    at  at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:3429)
    at  at org.codehaus.janino.UnitCompiler.access$6300(UnitCompiler.java:104)
    at  at org.codehaus.janino.UnitCompiler$11.visitMethodInvocation(UnitCompiler.java:2869)
    at  at org.codehaus.janino.Java$MethodInvocation.accept(Java.java:2831)
    at  at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:2890)
    at  at org.codehaus.janino.UnitCompiler.compileGetValue(UnitCompiler.java:3897)
    at  at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:1637)
    at  at org.codehaus.janino.UnitCompiler.access$1700(UnitCompiler.java:104)
    at  at org.codehaus.janino.UnitCompiler$5.visitReturnStatement(UnitCompiler.java:877)
    at  at org.codehaus.janino.Java$ReturnStatement.accept(Java.java:1803)
    at  at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:888)
    at  at org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:914)
    at  at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:1999)
    at  at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:789)
    at  at org.codehaus.janino.UnitCompiler.compileDeclaredMethods(UnitCompiler.java:770)
    at  at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:464)
    at  at org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:357)
    at  at org.codehaus.janino.UnitCompiler$3.visitPackageMemberClassDeclaration(UnitCompiler.java:312)
    at  at org.codehaus.janino.Java$PackageMemberClassDeclaration.accept(Java.java:770)
    at  at org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:319)
    at  at org.codehaus.janino.UnitCompiler.compileUnit(UnitCompiler.java:288)
    at  at org.codehaus.janino.SimpleCompiler.compileToClassLoader(SimpleCompiler.java:393)
    at  at org.codehaus.janino.ClassBodyEvaluator.compileToClass(ClassBodyEvaluator.java:311)
    at  at org.codehaus.janino.ClassBodyEvaluator.cook(ClassBodyEvaluator.java:224)
    at  at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:194)
    at  at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:80)
    at  at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:72)
    at  at ch.qos.logback.core.joran.conditional.PropertyEvalScriptBuilder.build(PropertyEvalScriptBuilder.java:34)
    at  at ch.qos.logback.core.joran.conditional.IfAction.begin(IfAction.java:43)
    at  at ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:273)
    at  at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:145)
    at  at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:127)
    at  at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:40)
    at  at ch.qos.logback.core.joran.spi.Interpreter.play(Interpreter.java:332)
    at  at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:126)
    at  at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:93)
    at  at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:52)
    at  at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:60)
    at  at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:121)
    at  at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85)
    at  at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
    at  at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121)
    at  at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:111)
    at  at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:268)
    at  at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:241)
    at  at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:254)
    at  at edu.kit.sdq.storagebenchmarkharness.Logger.getLogger(Logger.java:44)
    at  at edu.kit.sdq.storagebenchmarkharness.BenchmarkController.<clinit>(BenchmarkController.java:66)

Why is the method isDefined unkown? The logback docs state that it should exists, and at least one stack overflow thread seems to use it.

I included the most recent version of janino in my classpath because it is needed for the evalution of the expressions. The janino compiler gets loaded as you can see in the error message.

Answer

JBCP picture JBCP · Apr 9, 2013

Make sure you are using the latest version of logback. In addition, using conditionals in logback requires the Janino library.

Add this to your pom.xml file to get the dependency:

    <!-- The org.codehaus.janino:commons-compiler:2.6.1 dependency -->
    <!-- will be automatically pulled in by Maven's transitivity rules -->
    <dependency>
        <groupId>org.codehaus.janino</groupId>
        <artifactId>janino</artifactId>
        <version>2.6.1</version>
    </dependency>

Related questions

Logback: "Could not find Janino library on the class path"

I'm getting error message Could not find Janino library on the class path. Skipping conditional processing. What should I incude in classpath to fix this (lib and version)?

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

Regarding Eclipse IDE (Indigo, Juno and Kepler (32 and 64 bit versions)) Platforms: Windows, Ubuntu, Mac m2e version: 1.1.0.20120530-0009, 1.2.0.20120903-1050, 1.3.0.20130129-0926, 1.4.0.20130601-0317 General info The above error came after updating the m2e to version 1.1. By removing m2e 1.1 and rolling …

Read More
How can I configure Logback to log different levels for a logger to different destinations?

How can I configure Logback to log different levels for a logger to different destinations? For example, given the following Logback configuration, will Logback record INFO messages to STDOUT and ERROR messages to STDERR? (Note that this example is a …

Read More