SLF4JLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext

錯誤提示：

java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'logJdbcAppender': Invocation of init method failed; nested exception is java.lang.ClassCastException: org.apache.logging.slf4j.SLF4JLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext
Caused by: java.lang.ClassCastException: org.apache.logging.slf4j.SLF4JLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext

解決方法：

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
  <exclusions>
     <exclusion>
          <groupId>org.apache.logging.log4j</groupId>
          <artifactId>log4j-to-slf4j</artifactId>
      </exclusion>
      <exclusion>
          <groupId>org.slf4j</groupId>
          <artifactId>jul-to-slf4j</artifactId>
      </exclusion>
      <exclusion>
          <groupId>ch.qos.logback</groupId>
          <artifactId>logback-classic</artifactId>
      </exclusion>
  </exclusions>
</dependency>

說明：在有沖突的包里增加排除

  <exclusions>
     <exclusion>
          <groupId>org.apache.logging.log4j</groupId>
          <artifactId>log4j-to-slf4j</artifactId>
      </exclusion>
      <exclusion>
          <groupId>org.slf4j</groupId>
          <artifactId>jul-to-slf4j</artifactId>
      </exclusion>
      <exclusion>
          <groupId>ch.qos.logback</groupId>
          <artifactId>logback-classic</artifactId>
      </exclusion>
  </exclusions>

注意：在我的項目中，沖突的包，在 spring-boot-starter-web 中，但是你的可能不一定在這個里