Caused by: java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j_java hotspot(tm) 64-bit server vm warning: options-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_41575575/article/details/86631220

本文解析了在项目中遇到的log4j与slf4j框架冲突问题，详细阐述了错误信息中关于SLF4J绑定和log4j-over-slf4j与slf4j-log4j12共存导致的问题，并提供了正确的依赖引入方案。

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Caused by: java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.

今天在发布项目的时候，突然发现一个问题，贴出来跟大家分享一下，在今后的发布上线的时候注意一下！

报错如下：

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/phbj/programs/phservice/authenticateapi/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/phbj/programs/phservice/authenticateapi/lib/logback-classic-1.1.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. 
SLF4J: See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
Exception in thread "main" java.lang.ExceptionInInitializerError
	at org.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:72)
	at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:45)
	at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
	at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
	at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)
	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
	at org.apache.log4j.Category.<init>(Category.java:57)
	at org.apache.log4j.Logger.<init>(Logger.java:37)
	at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:43)
	at org.apache.log4j.Logger.getLogger(Logger.java:41)
	at org.apache.log4j.Logger.getLogger(Logger.java:49)
Caused by: java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
	at org.slf4j.impl.Log4jLoggerFactory.<clinit>(Log4jLoggerFactory.java:54)
	... 12 more

这个问题我们需要关注的是以下两部分

SLF4J: Found binding in [jar:file:/phbj/programs/phservice/authenticateapi/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/phbj/programs/phservice/authenticateapi/lib/logback-classic-1.1.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]

java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.

由这两部分我们可以看出问题是因为两个log4j 包冲突
log4j-over-slf4j-1.7.7.jar

slf4j-log4j12-1.7.7.jar

但是如果在中两个包当中但只引用slf4j-log4j12-1.7.7.jar会提示org.apache.log4j.Level这个class找不到
所以要使用log4j记录日志，其实只用引用log4j-over-slf4j-1.7.7.jar就可以了