Q: When deploy SuperMap iServer 8C War package in Tomcat6, an exception occurred while browsing the service: java.lang.NoClassDefFoundError:javax/servlet/AsyncListener、java.lang.ClassNotFoundException:javax.servlet.AsyncListener

A: iServer uses the asynchronous request function of Servlet 3.0. But in Tomcat6, it uses the Servlet 2.0, and does not contain this function. The solution is to upgrade the Servlet API 2.0 in Tomcat to 3.0.