解决方法：
MyEclipse->Window->Preferences->MyEclipse->Servers->Tomcat->Tomcat 6.x->Laucch->Create Launch Configuration->Classpath->Bootstrap Entities->Add External JARs->选择并填加tomcat的安装路径，比如：D:\Java\tomcat\bin\tomcat-juli.jar
【原】MyEclipse8.5集成Tomcat7时启动错误：Exception in thread “main” java.lang.NoClassDefFoundError
原文：http://www.cnblogs.com/temptation/p/4003665.html