问题一：  Tomcat无法启动,报错java.lang.NoClassDefFoundError: org/apache/juli/logging/LogFactory

          问题二：【Error】JavaWeb: 严重: Failed to initialize end point associated with ProtocolHandler ["http-bio-8080"]

          问题三：The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path

       这个问题困扰我不是因为它难解决， 而是因为总是找不到适合的dll，下载了很多次以后我才到与我的tomcat匹配且为64位的dll，下面看下我遇到的问题：

          启动tomcat的时候发现日志里有这么个奇怪的东西:信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre1.6.0_05\bin;D:\java\apache-tomcat-7.0.6.0\bin

     这个问题实际上是tomcat建议使用apache的apr,解决办法：是把tcnative-1.dll文件放至 Tomcat 7.0.6.0\bin 目录下

     我已将这个dll上传，欢迎大家下载使用：tcnative-1.dll