log4j-over-slf4j.jar AND slf4j-log4j12.jar 依赖冲突解决方案

使用maven构建项目时,如果项目中有log4j的依赖,在运行程序时可能会出现在同一个类中log4j-over-slf4j.jar和 slf4j-log4j12.jar冲突的问题:


项目报错内容为:

Exception in thread "main" java.lang.ExceptionInInitializerError
    at org.apache.log4j.LogManager.getLogger(LogManager.java:44)
    at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:66)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:270)
    at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)
    at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:657)
    at org.apache.hadoop.conf.Configuration.(Configuration.java:173)

Caused by: java.lang.IllegalStateException: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting StackOverflowError. See also http://www.slf4j.org/codes.html#log4jDelegationLoop for more details.
    at org.apache.log4j.Log4jLoggerFactory.(Log4jLoggerFactory.java:49)
    ... 8 more


原因是:log4j-over-slf4j和slf4j-log4j12是跟Java日志系统相关的两个jar包,当它们同时出现在classpath下时,就可能会引起堆栈溢出异常。


解决办法:pom.xml文件中,在使用到的依赖包中添加标签将slf4j-log4j12.jar排除即可:


例如:红色字体是排除的内容

      
            org.apache.hadoop
            hadoop-client
            2.6.0
                
                
                    org.slf4j
                    slf4j-log4j12
                

            

        


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