出现以下错误，是因为项目缺少依赖：
at org.springframework.boot.logging.logback.LogbackLoggingSystem.reportConfigurationErrorsIfNecessary(LogbackLoggingSystem.java:189)
at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:170)
at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithConventions(AbstractLoggingSystem.java:80)
at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:60)
at org.springframework.boot.logging.logback.LogbackLoggingSystem.initialize(LogbackLoggingSystem.java:132)
at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:329)
... 26 common frames omitted
Suppressed: ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type net.logstash.logback.appender.LogstashTcpSocketAppender
at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:68)
at ch.qos.logback.core.util.OptionHelper.instantiateByClassName(OptionHelper.java:44)
at ch.qos.logback.core.util.OptionHelper.instantiateByClassName(OptionHelper.java:33)
at ch.qos.logback.core.joran.action.AppenderAction.begin(AppenderAction.java:52)
at ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:269)
at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:145)
at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:128)
at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:50)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:165)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:152)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:110)
at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:53)
at org.springframework.boot.logging.logback.LogbackLoggingSystem.configureByResourceUrl(LogbackLoggingSystem.java:199)
at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:165)
... 30 common frames omitted
Caused by: java.lang.ClassNotFoundException: net.logstash.logback.appender.LogstashTcpSocketAppender
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:55)
... 43 common frames omitted
pom.xml中添加以下依赖，解决问题：
<dependency>
<groupId>net.logstash.logback</groupId>
<artifactId>logstash-logback-encoder</artifactId>
<version>6.3</version>
</dependency>
标签：lang,core,ClassNotFoundException,ch,java,qos,logback,LogbackLoggingSystem From： https://www.cnblogs.com/commissar-Xia/p/18398841