The Problem:

When I started my Java project, it threw an error:

Failed to instantiate [ch.qos.logback.classic.LoggerContext]
Reported exception:
java.lang.AbstractMethodError: ch.qos.logback.classic.pattern.EnsureExceptionHandling.process(Lch/qos/logback/core/Context;Lch/qos/logback/core/pattern/Converter;)V
at ch.qos.logback.core.pattern.PatternLayoutBase.start(PatternLayoutBase.java:86)
at ch.qos.logback.classic.encoder.PatternLayoutEncoder.start(PatternLayoutEncoder.java:28)
at ch.qos.logback.classic.BasicConfigurator.configure(BasicConfigurator.java:50)
at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150)
at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85)
at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:55)
at org.slf4j.LoggerFactory.bind(LoggerFactory.java:142)
at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:121)
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:332)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:284)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:305)
at org.tianlangstudio.data.hamal.common.Logging.$init$(Logging.scala:10)
at org.tianlangstudio.data.hamal.server.http.HttpServerApp$.(HttpServerApp.scala:12)
at org.tianlangstudio.data.hamal.server.http.HttpServerApp.main(HttpServerApp.scala)

Solution:

To fix this, I updated the logback version to 1.2.3 in pom.xml, ensuring campatibility with slf4j1.17.26

<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.7.26</version>
		</dependency>
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.2.3</version>
		</dependency>
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
			<version>1.2.3</version>
		</dependency>

Cause Root:

The error happens because the slf4j and logback verisons in the project aren't compatible.