springboot 整合druid出现 java.lang.N

maven导入log4j的jar包就解决了

<dependency>
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>
       <version>1.2.17</version>
   </dependency>

如果还是没有解决的话 改成导入log4j-over-slf4j这个就解决了

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>log4j-over-slf4j</artifactId>
    <version>1.7.26</version>
</dependency>