SLF4J: Detected both log4j-over-slf4j.jar AND 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.apache.log4j.LogManager.getLogger(LogManager.java:44)
 at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:66)
 at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:277)
 at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:288)
....
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.<clinit>(Log4jLoggerFactory.java:51)
 ... 11 more

原因是引用了两个关于log4j的jar,造成死循环

log4j-over-slf4j-1.7.7.jar

slf4j-log4j12-1.7.7.jar

但只引用slf4j-log4j12-1.7.7.jar会提示org.apache.log4j.Level这个class找不到

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

http://www.360doc.com/content/10/0908/15/1542811_52121394.shtml

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