CXF 动态调用webservice的错误

        String url = "http://localhost:8080/TestSpring/services/HelloWorld?wsdl";
        JaxWsDynamicClientFactory factory = JaxWsDynamicClientFactory
                .newInstance();
        Client client = factory.createClient(url);
        Object[] res = client.invoke("sayHi", "李晓辉");
        System.out.println(res[0]);
调用的代码就这么简单，但是却始终爆出如下额错误信息：
java.lang.NullPointerException
        at org.apache.cxf.common.util.Compiler.useJava6Compiler(Compiler.java:189)
        at org.apache.cxf.common.util.Compiler.compileFiles(Compiler.java:143)
        at org.apache.cxf.common.util.Compiler.compileFiles(Compiler.java:138)
        at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.compileJavaSrc(DynamicClientFactory.java:598)
        at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.createClient(DynamicClientFactory.java:367)
        at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.createClient(DynamicClientFactory.java:270)
        at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.createClient(DynamicClientFactory.java:263)
        at org.apache.cxf.endpoint.dynamic.DynamicClientFactory.createClient(DynamicClientFactory.java:198)
        at main.java.demo.hw.client.Client.main(Client.java:43)
经过查看Compiler的代码，发现useJava6Compiler方法里面有这么一句“JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();”空指针的异常就是来自这里。产生的原因是没有获得编译环境，也就是JRE设置的问题，需要在eclipse里面把jre设置为jdk下的jre

参考：http://blog.sina.com.cn/s/blog_55fc875c01016x90.html

在CXF动态创建客户端时，如下：

JaxWsDynamicClientFactory factory = JaxWsDynamicClientFactory.newInstance();
Client client = null;
// 创建客户端连接
client = factory.createClient("http://localhost:9090/cxf/saveLove?wsdl");

经测试，在createClient操作中，会生产webservice下所有方法类、参数类、返回值类等等文件，耗时相当惊人，超级慢，后来想要需要优化创建初始化步骤；

后来从博友http://ruijf.iteye.com/blog/1186961上看到创建的client是线性安全，正好是自己所想要的效果；

参考：http://pangsir.iteye.com/blog/1492515

public class HttpClientUtil {

	private static Map<String,Client> clientMap = new HashMap<String,Client>(); 

		/**
		 * 调用wms系统的方法
		 * @param serviceURL
		 * @param wareHouseCode
		 * @param reqXmlBody
		 * @return
		 * @throws Exception
		 */
		public static String invokeWebService(String serviceURL,String wareHouseCode,String reqXmlBody) throws Exception{
			Client client = (Client) clientMap.get(serviceURL);
			if(client==null){
				JaxWsDynamicClientFactory dcf = JaxWsDynamicClientFactory.newInstance();
				client = dcf.createClient(serviceURL);
				clientMap.put(serviceURL, client);
			}
			
			Object[] result = client.invoke("receiveReOrder", wareHouseCode , reqXmlBody);
			
			if(result!=null){
				return result[0].toString();
			}
			return null;
		}
}