xjc：无法支持类自定义

Question

我正在尝试从 DTD 生成的单个约 7,000 行 cXML 架构文件中生成代码。我已经能够解决一些与 xjc 自定义的冲突，但最后一个让我难住了。

我尝试过类和工厂方法自定义，但没有成功。

当我尝试应用工厂方法自定义时，我最终收到以下消息：

  [xjc] [ERROR] compiler was unable to honor this class customization. It is attached to a wrong place, or its inconsistent with other bindings.

其他人也遇到过这个问题并且能够解决它。（这个链接很有帮助。）

我想知道我的问题是否与元素的抽象性质有关。

这次绕道令人沮丧，非常感谢任何帮助。

这是架构中的片段：

  <xs:element name="cxml.payment" abstract="true">
    <xs:complexType> <!-- Line 2477 -->
      <xs:sequence>
        <xs:element minOccurs="0" ref="PostalAddress"/>
      </xs:sequence>
      <xs:attributeGroup ref="PCard.attlist"/>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="cxml.payment">
    <xs:sequence>
      <xs:element ref="cxml.payment"/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="Payment" type="cxml.payment" />

 <xs:element name="PCard" substitutionGroup="cxml.payment"/>

  <xs:attributeGroup name="PCard.attlist">
    <xs:attribute name="number" use="required" type="number"/>
    <xs:attribute name="expiration" use="required" type="date"/>
    <xs:attribute name="name" type="string"/>
  </xs:attributeGroup>

以下是原始错误：

> compile:
>      [echo] Compiling the schema...
>       [xjc] Compiling file:/..cXML.xsd
>       [xjc] [ERROR] A class/interface with the same name "cXML.CxmlPayment" is already in use. Use a class customization to
> resolve this conflict.
>       [xjc]   line 2477 of file:..cXML.xsd
>       [xjc]
>       [xjc] [ERROR] (Relevant to above error) another "CxmlPayment" is generated from here.
>       [xjc]   line 2477 of file:..cXML.xsd
>       [xjc]
>       [xjc] [ERROR] (Relevant to above error) This confusing error happened most likely because the schema uses a technique called
> "chameleon schema", which causes a single definition to be loaded
> multiple times into different namespaces. See
> http://forums.java.net/jive/thread.jspa?threadID=18631 for more about
> this.
>       [xjc]   line 2477 of file:..cXML.xsd
>       [xjc]
>       [xjc] [ERROR] Two declarations cause a collision in the ObjectFactory class.
>       [xjc]   line 2477 of file:..cXML.xsd
>       [xjc]
>       [xjc] [ERROR] (Related to above error) This is the other declaration.
>       [xjc]   line 2477 of file:..cXML.xsd
>       [xjc]
>       [xjc] failure in the XJC task. Use the Ant -verbose switch for more details

Answer 1

嗯，当然，我应该想到的。我一发布问题，解决方案就出现了。

根据 JAXB “默认绑定规则”，绑定编译器尝试为每个 Element 和每个命名的 ComplexType 创建一个 Java 类。造成冲突的原因是两个名称都使用了 cxml. payment。

在本例中，只需要这个简单的类自定义即可：

 <jxb:bindings node="//xs:element[@name='cxml.payment']/xs:complexType">
     <jxb:class name="CxmlInnerPaymentType" />
 </jxb:bindings>

我们的教训是密切关注 xjc 错误消息中的行号。在这种情况下，他们一直将我指向第 2477 行。