axis报错 java.lang.NoClassDefFoundError: javax.mail.inter

执行OrderService service = new OrderServiceLocator();的时候报如下错误：
Caused by: java.lang.NoClassDefFoundError: javax.mail.internet.MimeMultipart
at org.apache.axis.encoding.DefaultTypeMappingImpl.class$(DefaultTypeMappingImpl.java:120)
at org.apache.axis.encoding.DefaultTypeMappingImpl.initMappings(DefaultTypeMappingImpl.java:308)
at org.apache.axis.encoding.DefaultTypeMappingImpl.<init>(DefaultTypeMappingImpl.java:91)
at org.apache.axis.encoding.DefaultTypeMappingImpl.getSingletonDelegate(DefaultTypeMappingImpl.java:85)
at org.apache.axis.encoding.TypeMappingRegistryImpl.<init>(TypeMappingRegistryImpl.java:155)
at org.apache.axis.encoding.TypeMappingRegistryImpl.<init>(TypeMappingRegistryImpl.java:149)
at org.apache.axis.deployment.wsdd.WSDDDeployment.<init>(WSDDDeployment.java:449)
at org.apache.axis.deployment.wsdd.WSDDDocument.setDocument(WSDDDocument.java:139)
at org.apache.axis.deployment.wsdd.WSDDDocument.<init>(WSDDDocument.java:65)
at org.apache.axis.configuration.FileProvider.configureEngine(FileProvider.java:179)
at org.apache.axis.AxisEngine.init(AxisEngine.java:172)
at org.apache.axis.AxisEngine.<init>(AxisEngine.java:156)
at org.apache.axis.client.AxisClient.<init>(AxisClient.java:52)
at org.apache.axis.client.Service.getAxisClient(Service.java:104)
at org.apache.axis.client.Service.<init>(Service.java:113)
at com.zving.shop.webservice.order.OrderServiceLocator.<init>(OrderServiceLocator.java:14)
本人反编译了一下代码，是在DefaultTypeMappingImpl类中的这个地方报的错：
myRegister(Constants.MIME_MULTIPART, MimeMultipart.class, new JAFDataHandlerSerializerFactory(MimeMultipart.class, Constants.MIME_MULTIPART), new JAFDataHandlerDeserializerFactory(MimeMultipart.class, Constants.MIME_MULTIPART));
本人已经有了mail.jar和activation.jar而且在 new OrderServiceLocator();假如调用System.out.println(MimeMultipart.class)是可以正常输出的，求高手解答，急。
环境：eclipse  jdk1.5