在用maven搭建工程的时候，工程老是出以下两个错误： Cannot change version of project facet Dynamic Web Module to 2.3. One or more constraints have not been satisfied. 在网上查找了很多方法，最后确认了，jdk设置都正确，但还是报这两个错误，后来检查web.xm

六月 05, 2017 3:34:34 下午 org.apache.catalina.core.AprLifecycleListener init 信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on t