警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:webProject'

步骤：关闭Tomcat，将项目删除，然后clean.彻底删除后，双击控制台的Tomcat v7.0 at localhost。在弹出的页面中选中Publish module contexts to separate XML files选项。保存退出。重新加载项目运行，搞定。