JAXB xjc：解决从 AUTOSAR XSD 生成类时的非法类继承循环

Question

我正在使用 JAXB 的 xjc 工具从 AUTOSAR XSD 文件生成 Java 类，并遇到了 IllegalArgumentException，指示非法的类继承循环。这是我收到的错误消息：

Exception in thread "main" java.lang.IllegalArgumentException: Illegal class inheritance loop.  Outer class TargetIPduRefElement may not subclass from inner class: TargetIPduRefElement
        at [email protected]/com.sun.codemodel.JDefinedClass._extends(JDefinedClass.java:247)
        at [email protected]/com.sun.tools.xjc.generator.bean.ImplStructureStrategy$1._extends(ImplStructureStrategy.java:96)
        at [email protected]/com.sun.tools.xjc.generator.bean.BeanGenerator.<init>(BeanGenerator.java:187)
        at [email protected]/com.sun.tools.xjc.generator.bean.BeanGenerator.generate(BeanGenerator.java:141)
        at [email protected]/com.sun.tools.xjc.model.Model.generateCode(Model.java:259)
        at [email protected]/com.sun.tools.xjc.Driver.run(Driver.java:365)
        at [email protected]/com.sun.tools.xjc.Driver.run(Driver.java:198)
        at [email protected]/com.sun.tools.xjc.Driver._main(Driver.java:117)
        at [email protected]/com.sun.tools.xjc.Driver$1.run(Driver.java:76)

有人遇到过类似的问题并找到解决方法吗？对于如何调试此问题的任何见解或建议，我将不胜感激。

Answer 1

为了使 xjc 编译您的 XSD（来自您的链接），我必须添加以下绑定文件

<jaxb:bindings version="3.0"
               xmlns:jaxb="https://jakarta.ee/xml/ns/jaxb"
               xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <jaxb:bindings schemaLocation="AUTOSAR_00046.xsd" node="/xs:schema">
    <!--
      Fixes :
      Simple type "{0}" was not mapped to Enum due to EnumMemberSizeCap limit. Facets count: {1}, current limit: {2}. You can use customization attribute "typesafeEnumMaxMembers" to extend the limit.
    -->
    <jaxb:globalBindings typesafeEnumMaxMembers="1024" />

    <!--
      Fixes Property "{0}" is already defined. Use &lt;jaxb:property> to resolve this conflict.
    -->
    <jaxb:bindings node="//xs:attributeGroup[@name='ENTRY']//xs:attribute[@name='BGCOLOR']">
      <jaxb:property name="BGCOLORAttr"></jaxb:property>
    </jaxb:bindings>

    <!--
      Fixes Complex type and its child element share the same name "{0}". Use a class customization to resolve this conflict.
    -->
    <jaxb:bindings node="//xs:group[@name='COMPU-SCALES']/xs:sequence/xs:element[@name='COMPU-SCALES']/xs:complexType">
      <jaxb:class name="CompuScalesElement"/>
    </jaxb:bindings>
    <jaxb:bindings node="//xs:group[@name='TARGET-I-PDU-REF']/xs:sequence/xs:element[@name='TARGET-I-PDU-REF']/xs:complexType">
      <jaxb:class name="TargetIPduRefElement"/>
    </jaxb:bindings>
  </jaxb:bindings>
</jaxb:bindings>

这将解决在没有任何绑定文件的情况下遇到的问题：

• typesafeEnumMaxMembers="1024"

  将解决枚举未生成的问题（根据最大成员数调整）
• “属性 XXX 已定义。使用 解决此冲突。”对于

  BGCOLOR

  属性
• “复杂类型及其子元素共享相同的名称 XXX”对于

  TARGETIPDUREF

  和

  COMPUSCALES

如果不使用 jaxb3/4（基于 jakarta），您可以使用以下内容更改文件头以使其与 jaxb2 兼容

<jaxb:bindings version="2.1"
               xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
               xmlns:xs="http://www.w3.org/2001/XMLSchema">