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Log4JLogger cannot be found

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java.lang.ExceptionInInitializerError
Caused by: org.apache.commons.logging.LogConfigurationException: User-specified log class 'org.apache.commons.logging.impl.Log4JLogger' cannot be found or is not useable.
at org.apache.commons.logging.impl.LogFactoryImpl.discoverLogImplementation(LogFactoryImpl.java:798)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:601)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:333)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:307)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:645)
at com.coderdream.log4jDao.HelloDao.<clinit>(HelloDao.java:10)
Exception in thread "main"


原来log4j版本过低 1.1.x,确确实实无法在org.apache.commons.logging.impl找到Log4JLogger,其他的xxxLogger倒是有几个 .....
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