jaxws，WebService，布署到独立Tomcat7，无法启动

Question

工具：MyEclipse2014 for spring
问题：
使用jaxws开发的WebService服务端，布署到独立的Tomcat7.0.54时，无法启动。
日志
严重: Error configuring application listener of class com.sun.xml.ws.transport.http.servlet.WSServletContextListener
java.lang.ClassNotFoundException: com.sun.xml.ws.transport.http.servlet.WSServletContextListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:529)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:511)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:139)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4888)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1247)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1898)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
后来搜索了一下，说是jdk不带jaxws的包，下载了jaxws-ri-2.2.10.zip把lib的jar放到项目lib下成功启动。
但是在用MyEclipse开发时运行就没有问题，用的是MyEclipse自己带的Tomcat
**我的问题是：为什么在Myeclipse自带的Tomcat中它就能启动，我搜索了整个Myeclipse文件夹，也没找到WSServletContextListener这个类，为什么它就能加载这个类，MyEclipse的Tomcat从哪里加载这个类？**

Answer 1

你不止用tomcat是自带的，，jdk也是myeclipse自带的