VAADIN应用在Tomcat下部署下的出现ClassNotFoundException问题

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问题描述

在Tomcat 8下，部署VAADIN 7.3的应用，参考VAADIN的指导进行部署：

This Vaadin zip contains all the jars of the Vaadin Framework. Additionally all dependencies are provided in the lib folder.To use in a web project:1. Copy all vaadin-* files except vaadin-client and vaadin-client-compiler to WEB-INF/lib in your project2. Copy lib/*.jar to WEB-INF/lib in your project3. Copy vaadin-client and vaadin-client-compiler to a lib folder which is on your classpath but will not be deployed. These files are only needed when compiling a module (widget set) to Javascript.If you are using Eclipse and a standard WTP (Dynamic Web Project or Vaadin Project), step 3 can be:Create a /lib folder, copy the files there and right click the lib folder and select "Build Path" -> "Add to Build Path".Once this is done, the "Compile widgetset" button provided by the Vaadin Plug-in for Eclipse will work correctly.

发现在加载VAADIN生成web页面时，出现了ClassNotFoundException异常：

[Servlet execution threw an exception] with root causejava.lang.ClassNotFoundException: org.eclipse.jetty.websocket.WebSocketFactory$Acceptor    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1711)    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)    at org.atmosphere.container.JettyServlet30AsyncSupportWithWebSocket.service(Servlet30AsyncSupportWithWebSocket.java:59)    at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:1124)    at org.atmosphere.cpr.AtmosphereServlet.doPost(AtmosphereServlet.java:293)    at org.atmosphere.cpr.AtmosphereServlet.doGet(AtmosphereServlet.java:279)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)......

解决方案

经过查找资料和多方验证，最终发现Atmosphere框架发现其运行在错误的服务器上，这个问题的发生通常是由于你的应用配置了错误的依赖文件。在Tomcat的配置环境下，应用部署目录WEB-IF/lib下包含jetty-server.jar，就会抛出上述异常。解决方法就是删除该目录下Jetty相关的jar文件。

此问题困扰了2天，最终google查询到参考资料的web资料，最终得以解决。读者可以参考此资料以了解详细信息。

参考资料

1. ClassNotFoundException at startup

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