异常信息如下：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/ws/commons/schema/utils/NamespacePrefixList
at org.apache.cxf.jaxws.JaxWsClientFactoryBean.<init>(JaxWsClientFactoryBean.java:38)
at org.apache.cxf.jaxws.JaxWsProxyFactoryBean.<init>(JaxWsProxyFactoryBean.java:64)
at cn.navidog.common.webwervice.client.RankClient.<clinit>(RankClient.java:21)
at cn.navidog.front.users.testwebservice.main(testwebservice.java:10)
Caused by: java.lang.ClassNotFoundException: org.apache.ws.commons.schema.utils.NamespacePrefixList
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 4 more
原因是因为缺少XmlSchema.jar这个包，只要将这个jar导入，问题就解决了。