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现象： java.lang.NoClassDefFoundError: org/apache/log4j/Level at org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:230) at org.slf4j.LoggerFactory.bind(LoggerFactory.java:121) at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:112) at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:275) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:248) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:261) at HttpUtils2.<clinit>(HttpUtils2.java:66)
原因其实是缺少log4j相关的jar，在classpath中加入log4j-1.2.14.jar即可解决问题。
解决java.lang.NoClassDefFoundError: org/apache/log4j/Level
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原文地址：http://www.cnblogs.com/sprinng/p/5787288.html
