本文介绍了条件功能在Logback中是如何工作的？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用此登录配置文件：
<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>
运行我的应用程序时，我收到以下错误：
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)
为什么方法isDefined未知？logback docs声明它应该存在，并且至少one stack overflow线程似乎在使用它。
我在类路径中包含了最新版本的janino，因为它是计算表达式所必需的。加载janino编译器，如您在错误消息中所见。
推荐答案
确保您使用的是最新版本的LogBack。此外，在Logbackrequires the Janino library中使用条件句。
将此代码添加到pom.xml文件以获得依赖项：
<!-- 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>
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