SpringBoot使用log4j2启动java.lang.StackOverflowError的原因

jar包冲突了，具体冲突是log4j-slf4j-impl-2.10.0.jar和log4j-to-slf4j-2.10.0.jar，把log4j-slf4j-impl-2.10.0.jar在pom文件里排除引用即可，使用exclusions，解决方法如下：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>