To get rid of below message, what should I do? What I have tried is that 1.6, 1.8, 1.11 version of JAnsi have been load to class path. But, same messages is shown Environment: Windows 7, Eclipse My configuration file: <?xml version="1.0" encoding="UTF-8"?> <configuration> <appender name ="Console" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <charset> UTF-8 </charset> <pattern>%-5level [%thread] %class{0}.%method at line %line -- %message%n%ex</pattern> </encoder> </appender> <root level="DEBUG"> <appender-ref ref="Console" /> </root> </configuration> UGLY collection of things, each time gives those things 15:47:49,379 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy] 15:47:49,379 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback-test.xml] at [file:/C:/Users/dell/Documents/GitHub/CorrelationAnalysis/DataScienceApprenticeship/execBin/logback-test.xml] 15:47:49,463 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set 15:47:49,473 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 15:47:49,483 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [ConsoleAppender] 15:47:49,508 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 15:47:49,557 |-INFO in ch.qos.logback.core.ConsoleAppender[ConsoleAppender] - Enabling JANSI WindowsAnsiOutputStream for the console. 15:47:49,558 |-WARN in ch.qos.logback.core.ConsoleAppender[ConsoleAppender] - Failed to create WindowsAnsiOutputStream. Falling back on the default stream. ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type org.fusesource.jansi.WindowsAnsiOutputStream at ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type org.fusesource.jansi.WindowsAnsiOutputStream at at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:73) at at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:42) at at ch.qos.logback.core.ConsoleAppender.getTargetStreamForWindows(ConsoleAppender.java:94) at at ch.qos.logback.core.ConsoleAppender.start(ConsoleAppender.java:85) at at ch.qos.logback.core.joran.action.AppenderAction.end(AppenderAction.java:96) at at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:317) at at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:196) at at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:182) at at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:62) at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:149) at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:135) at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:99) at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:49) at at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75) at at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150) 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:129) at at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:108) at at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:302) at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:276) at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:288) at at dot.dataCom<clinit>(dataCom.java:49) at at dot.dataCom(dataComTest.java:30) at at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at at java.lang.reflect.Method.invoke(Unknown Source) at at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at at org.junit.runners.Suite.runChild(Suite.java:128) at at org.junit.runners.Suite.runChild(Suite.java:24) at at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.ClassNotFoundException: org.fusesource.jansi.WindowsAnsiOutputStream at at java.net.URLClassLoader$1.run(Unknown Source) at at java.net.URLClassLoader$1.run(Unknown Source) at at java.security.AccessController.doPrivileged(Native Method) at at java.net.URLClassLoader.findClass(Unknown Source) at at java.lang.ClassLoader.loadClass(Unknown Source) at at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at at java.lang.ClassLoader.loadClass(Unknown Source) at at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:60) at ... 46 common frames omitted