springboot项目启动时报错：Exception in thread “main“ java.lang.NoClassDefFoundError: org/slf4j/Logger......

一、错误信息如下：

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/Logger
    at org.apache.logging.slf4j.SLF4JLoggerContext.getLogger(SLF4JLoggerContext.java:39)
    at org.apache.commons.logging.LogAdapter$Log4jLog.<init>(LogAdapter.java:165)
    at org.apache.commons.logging.LogAdapter$Log4jAdapter.createLog(LogAdapter.java:122)
    at org.apache.commons.logging.LogAdapter.createLog(LogAdapter.java:89)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:67)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:59)
    at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:196)
    at com.zone.gateway.SigmaGatewayApplication.main(SigmaGatewayApplication.java:17)
Caused by: java.lang.ClassNotFoundException: org.slf4j.Logger
    at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    ... 8 more

 二、解决方法：

修改pom.xml中slf4j依赖配置：

原来：

<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <scope>provided</scope>
</dependency>

 改为下面配置：

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.25</version>
    </dependency>
    <!-- This is used for slf4j binding with log4j -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
      <scope>test</scope>
    </dependency>

参考资料：

https://www.5axxw.com/questions/content/ve908qhttps://www.5axxw.com/questions/content/ve908qidea环境配置如下： 

采用jdk11，启动正常。