LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback

今天在启动之前的Spring Boot项目的时候出现了这样的异常：

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/H:/maven/repository/org/slf4j/slf4j-log4j12/1.7.25/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/H:/maven/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
Disconnected from the target VM, address: '127.0.0.1:6264', transport: 'socket'
Exception in thread "main" java.lang.IllegalArgumentException: LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback or the competing implementation (class org.slf4j.impl.Log4jLoggerFactory loaded from file:/H:/maven/repository/org/slf4j/slf4j-log4j12/1.7.25/slf4j-log4j12-1.7.25.jar). If you are using WebLogic you will need to add 'org.slf4j' to prefer-application-packages in WEB-INF/weblogic.xml: org.slf4j.impl.Log4jLoggerFactory
  at org.springframework.util.Assert.instanceCheckFailed(Assert.java:637)
  at org.springframework.util.Assert.isInstanceOf(Assert.java:537)
  at org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:274)
  at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:99)
  at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:191)
  at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:170)
  at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
  at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
  at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
  at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127)
  at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:68)
  at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:313)

显然是jar包冲突了，联想到前几天添加了ZooKeeper的相关依赖，将相关依赖排除即可。

解决方式一：

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
                <exclusion>
                    <groupId>ch.qos.logback</groupId>
                   <artifactId>logback-classic</artifactId>
                </exclusion>
           </exclusions>
</dependency>

或者

如果你项目的日志是基于Spring Boot的日志来的，建议不要使用这个方法。

解决方式二：

排除ZooKeeper中的依赖：

解决方式三：

依赖上移，我的ZooKeeper依赖是在service模块中，将其移至父工程中即可。