spring-boot-starter-log4j2和spring-boot-starter-logging同时存在会产生冲突_spring-boot-starter-logging 和 log4j2

错误日志：

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory]
Exception in thread "main" java.lang.StackOverflowError
	at org.apache.logging.log4j.util.StackLocator.getCallerClass(StackLocator.java:112)
	at org.apache.logging.log4j.util.StackLocator.getCallerClass(StackLocator.java:125)
	at org.apache.logging.log4j.util.StackLocatorUtil.getCallerClass(StackLocatorUtil.java:55)
	at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:42)
	at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
	at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)

产生此错误的原因：logback-classic包和slf4j包冲突。 

解决方法：

找到哪个依赖引入了logback-classic,然后用依赖排除标签排除掉。

找到了，然后：

<!--springboot-websocket服务-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
    <!--排除-->
    <exclusions>
        <exclusion>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
        </exclusion>
    </exclusions>
</dependency>