java - 空目标节点中结果的 XPath 评估

Question

我的 wsdl 规范包含导入的 XSD 架构。

wsdl 文件如下所示

<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" ....>
<wsdl:types>
<xsd:schema targetNamespace="http://tempuri.org/Imports">
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd2" namespace="http://tempuri.org/"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svcc?xsd=xsd4" namespace="http://schemas.datacontract.org/2004/07/System.Web.Services.Protocols"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd0" namespace="http://schemas.microsoft.com/2003/10/Serialization/"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd1" namespace="http://schemas.datacontract.org/2004/07/ABCUser.Web.Services"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd3" namespace="http://schemas.datacontract.org/2004/07/ABCUser.Web.ServiceModels"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd5" namespace="http://schemas.datacontract.org/2004/07/System"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd6" namespace="http://schemas.microsoft.com/2003/10/Serialization/Arrays"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd7" namespace="http://schemas.datacontract.org/2004/07/System.Collections.Generic"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd8" namespace="http://schemas.datacontract.org/2004/07/ABC.Fs.UIEntities"/>
<xsd:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd9"/>
</xsd:schema>
</wsdl:types>
 .......
 </wsdl:definitions>

我的 jaxb 绑定(bind)文件如下所示:

<jaxws:bindings xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
    xmlns:jaxws="http://java.sun.com/xml/ns/jaxws"
    xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" jaxb:version="2.1"
    wsdlLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?wsdl">
    <enableWrapperStyle>true</enableWrapperStyle>
    <enableAsyncMapping>false</enableAsyncMapping>
    <jaxws:bindings node="wsdl:definitions/wsdl:types/xs:schema/xs:complexType[@name='Node']/xs:sequence/xs:element[@name='Type']">
    <jaxb:class name="NodeTypeString"/>
    </jaxws:bindings>    
</jaxws:bindings>

如果我不使用 bindings.xml，我会在通过 wsimport 生成 java 类时遇到以下错误

[ERROR] Two declarations cause a collision in the ObjectFactory class.
  line 1 of https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd3

[ERROR] (Related to above error) This is the other declaration.
  line 1 of https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd3

它提示的架构如下所示

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://schemas.datacontract.org/2004/07/ABCUser.Web.ServiceModels" elementFormDefault="qualified" targetNamespace="http://schemas.datacontract.org/2004/07/ABCUser.Web.ServiceModels">
<xs:import schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd6" namespace="http://schemas.microsoft.com/2003/10/Serialization/Arrays"/>
.......
<xs:complexType name="Node">
<xs:sequence>
<xs:element minOccurs="0" name="Description" nillable="true" type="xs:string"/>
<xs:element minOccurs="0" name="Name" nillable="true" type="xs:string"/>
<xs:element minOccurs="0" name="Type" nillable="true" type="xs:string"/>
<xs:element minOccurs="0" name="Users" nillable="true" type="tns:ArrayOfUser"/>
</xs:sequence>
</xs:complexType>
<xs:element name="Node" nillable="true" type="tns:Node"/>
......

但是现在当我使用 bindings.xml 时，出现以下错误

[ERROR] XPath evaluation of "wsdl:definitions/wsdl:types/xs:schema/xs:complexType[@name='Node']/xs:sequence/xs:element[@name='Type']" results in an empty target node
  line 8 of file:/E:/projects/codegeneration/bindings.xml

我错过了什么？我正在使用 wsimport 生成类。

Answer 1

<xsd:import>实际上并没有改变 WSDL 文件的 XML 文档树。您有匹配 wsdl:definitions/wsdl:types/xs:schema/xs:import 的元素, 不是 wsdl:definitions/wsdl:types/xs:schema/xs:complexType/xs:sequence/xs:element .

JAX-WS 规范的“定制”一章说:

Additionally, jaxb:bindings MAY appear inside a JAX-WS external binding file as a child of a jaxws:bindings element whose node attribute points to a xs:schema element inside a WSDL document. When the schema is processed, the outcome MUST be as if the jaxb:bindings element was inlined inside the schema document as an annotation on the schema component.

While processing a JAXB binding declaration (i.e. a jaxb:bindings element) for a schema document embedded inside a WSDL document, all XPath expressions that appear inside it MUST be interpreted as if the containing xs:schema element was the root of a standalone schema document.

所以，你的内心jaxws:bindings元素必须包含 xs:schema 的 XPath元素，而不是它的任何后代:

<jaxws:bindings node="wsdl:definitions/wsdl:types/xs:schema">
    <jaxb:bindings node="xs:complexType[@name='Node']/xs:sequence/xs:element[@name='Type']">
        <jaxb:class name="NodeTypeString"/>
    </jaxb:bindings>
</jaxws:bindings>    

我不确定以上是否真的适用于使用 <xsd:import> 的模式.您可能必须明确引用导入的架构:

<jaxws:bindings node="wsdl:definitions/wsdl:types/xs:schema">
    <jaxb:bindings schemaLocation="https://abcserver.com/v2/two-way-ssl/MyService.svc?xsd=xsd2">
        <jaxb:bindings node="xs:complexType[@name='Node']/xs:sequence/xs:element[@name='Type']">
            <jaxb:class name="NodeTypeString"/>
        </jaxb:bindings>
    </jaxb:bindings>
</jaxws:bindings>