我在类路径中有commons-logging.jar(v1.0.4)和log4j-1.2.8.jar并出现以下运行时错误:Causedby:org.apache.commons.logging.LogConfigurationException:User-specifiedlogclass'org.apache.commons.logging.impl.Log4JLogger'cannotbefoundorisnotuseable.atorg.apache.commons.logging.impl.LogFactoryImpl.discoverLogImplementation(Log