Java 无法使用ksoap从android使用jboss公开的Web服务

我是android和ws的新手。我有一个jboss服务器，在其中我使用注释公开了一些web服务。我正在使用ksoap2库使用该web服务，但它抛出RunTimeException:无法序列化错误

WSDL:

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="AccountOperationService" targetNamespace="http://provider.account.com/Version1" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://provider.account.com/Version1" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 <types>
  <xs:schema targetNamespace="http://provider.account.com/Version1" version="1.0" xmlns:tns="http://provider.account.com/Version1" xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:element name="CreateException" type="tns:CreateException"/>
   <xs:element name="getAccountDetail" type="tns:getAccountDetail"/>
   <xs:complexType name="init">
    <xs:sequence/>
   </xs:complexType>
   <xs:complexType name="initResponse">
    <xs:sequence/>
   </xs:complexType>
   <xs:complexType name="CreateException">
    <xs:sequence>
     <xs:element minOccurs="0" name="message" type="xs:string"/>
    </xs:sequence>
   </xs:complexType>
   <xs:complexType name="getAccountDetail">
    <xs:sequence>
     <xs:element minOccurs="0" name="arguments" type="tns:getAccountDetailRequestVO"/>
    </xs:sequence>
   </xs:complexType>
   <xs:complexType name="getAccountDetailRequestVO">
    <xs:sequence>
     <xs:element name="accountNumber" type="xs:string"/>
     <xs:element name="balanceInfoRequired" nillable="true" type="xs:boolean"/>
    </xs:sequence>
   </xs:complexType>
   <xs:complexType name="getAccountDetailResponse">
    <xs:sequence>
     <xs:element minOccurs="0" name="return" type="tns:accountDetailResponseVO"/>
    </xs:sequence>
   </xs:complexType>
   <xs:complexType name="accountDetailResponseVO">
    <xs:complexContent>
     <xs:extension base="tns:integrationBaseResponse">
      <xs:sequence>
       <xs:element minOccurs="0" name="accountVOs" nillable="true" type="tns:accountResponseVO"/>
      </xs:sequence>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="accountResponseVO">
    <xs:complexContent>
     <xs:extension base="tns:integrationBaseResponse">
      <xs:sequence>
       <xs:element name="accountNumber" type="xs:string"/>
       <xs:element minOccurs="0" name="firstName" nillable="true" type="xs:string"/>
       <xs:element minOccurs="0" name="lastName" nillable="true" type="xs:string"/>
       <xs:element minOccurs="0" name="password" nillable="true" type="xs:string"/>
       <xs:element minOccurs="0" name="userName" nillable="true" type="xs:string"/>
      </xs:sequence>
     </xs:extension>
    </xs:complexContent>
   </xs:complexType>
  </xs:schema>
 </types>
 <message name="AccountOperation_getAccountDetail">
  <part element="tns:getAccountDetail" name="getAccountDetail"/>
 </message>

  <operation name="getAccountDetail" parameterOrder="getAccountDetail">
   <input message="tns:AccountOperation_getAccountDetail"/>
   <output message="tns:AccountOperation_getAccountDetailResponse"/>
  </operation>

 </portType>
 <binding name="AccountOperation" type="tns:AccountOperation">
  <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>

  <operation name="getAccountDetail">
   <soap:operation soapAction=""/>
   <input>
    <soap:body use="literal"/>
   </input>
   <output>
    <soap:body use="literal"/>
   </output>
  </operation>

 </binding>
 <service name="AccountOperationService">
  <port binding="tns:AccountOperationBinding" name="AccountOperationPort">
   <soap:address location="http://10.110.1.98:8080/account/AccountOperationsWebService/AccountOperationService/AccountOperation"/>
  </port>
 </service>
</definitions>

例外情况：

java.lang.RuntimeException: Cannot serialize: accountNumber : ACCM561680
java.lang.RuntimeException: Cannot serialize: accountNumber : ACCM561680
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeElement(SoapSerializationEnvelope.java:664)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeProperty(SoapSerializationEnvelope.java:649)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeObjectBody(SoapSerializationEnvelope.java:604)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeObjectBody(SoapSerializationEnvelope.java:582)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeElement(SoapSerializationEnvelope.java:658)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeBody(SoapSerializationEnvelope.java:564)
    at org.ksoap2.SoapEnvelope.write(SoapEnvelope.java:205)
    at org.ksoap2.transport.Transport.createRequestData(Transport.java:111)
    at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:121)
    at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:96)
    at MyBackgroundTask_Billing2.doInBackground(MyBackgroundTask_Billing2.java:33)
    at MyBackgroundTask_Billing2.main(MyBackgroundTask_Billing2.java:55)

提前谢谢

java.lang.RuntimeException: Cannot serialize: accountNumber : ACCM561680
java.lang.RuntimeException: Cannot serialize: accountNumber : ACCM561680
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeElement(SoapSerializationEnvelope.java:664)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeProperty(SoapSerializationEnvelope.java:649)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeObjectBody(SoapSerializationEnvelope.java:604)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeObjectBody(SoapSerializationEnvelope.java:582)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeElement(SoapSerializationEnvelope.java:658)
    at org.ksoap2.serialization.SoapSerializationEnvelope.writeBody(SoapSerializationEnvelope.java:564)
    at org.ksoap2.SoapEnvelope.write(SoapEnvelope.java:205)
    at org.ksoap2.transport.Transport.createRequestData(Transport.java:111)
    at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:121)
    at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:96)
    at MyBackgroundTask_Billing2.doInBackground(MyBackgroundTask_Billing2.java:33)
    at MyBackgroundTask_Billing2.main(MyBackgroundTask_Billing2.java:55)