Question

我有一个具有抽象类型的XML模式，如下所示：

<xs:complexType name="AbstractFinancialAnalysis" abstract="true">
  <xs:sequence>
    <xs:element name="comment" type="xs:string" minOccurs="0"/>
  </xs:sequence>
  <xs:attribute name="currency" type="enums:Currency" use="optional"/>
  <xs:attribute name="statement_date" type="xs:date" use="required"/>
</xs:complexType>

<xs:complexType name="FinancialAnalysisUG">
  <xs:complexContent>
    <xs:extension base="AbstractFinancialAnalysis">
      <xs:sequence>
        <!-- some elements -->
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>

<xs:complexType name="FinancialAnalysisKP">
  <xs:complexContent>
    <xs:extension base="AbstractFinancialAnalysis">
      <xs:sequence>
        <!-- some elements -->
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>

<xs:complexType name="FinancialAnalysisIB">
  <xs:complexContent>
    <xs:extension base="AbstractFinancialAnalysis">
      <xs:sequence>
        <!-- some elements -->
      </xs:sequence>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>

<xs:complexType name="FinancialAnalysisWrapper">
  <xs:sequence>
    <xs:element name="xml_data" type="fadata:AbstractFinancialAnalysis" />
  </xs:sequence>
  <!-- some attributes -->
</xs:complexType>

<xs:element name="financial_analysis_response">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="financial_analysis" type="FinancialAnalysisWrapper" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

创建的Java类如下：

// -----  ObjectFactory.java ----- //
@XmlRegistry
public class ObjectFactory {

  private final static QName _FinancialAnalysisUg_QNAME = new QName("http://rsnag.ch/cm/FinancialAnalysisWrapper/Main-6", "financial_analysis_ug");
  private final static QName _FinancialAnalysisIb_QNAME = new QName("http://rsnag.ch/cm/FinancialAnalysisWrapper/Main-6", "financial_analysis_ib");
  private final static QName _FinancialAnalysisKp_QNAME = new QName("http://rsnag.ch/cm/FinancialAnalysisWrapper/Main-6", "financial_analysis_kp");

  public FinancialAnalysisResponse createFinancialAnalysisResponse() {
    return new FinancialAnalysisResponse();
  }

  public AbstractFinancialAnalysis createFinancialAnalysisIB() {
    return new FinancialAnalysisIB();
  }

  public AbstractFinancialAnalysis createFinancialAnalysisKP() {
    return new FinancialAnalysisKP();
  }

  public AbstractFinancialAnalysis createFinancialAnalysisUG() {
    return new FinancialAnalysisUG();
  }

  @XmlElementDecl(namespace = "http://rsnag.ch/cm/FinancialAnalysisWrapper/Main-6", name = "financial_analysis_ug")
  public JAXBElement<FinancialAnalysisUG> createFinancialAnalysisUg(FinancialAnalysisUG value) {
    return new JAXBElement<>(_FinancialAnalysisUg_QNAME, FinancialAnalysisUG.class, null, value);
  }

  @XmlElementDecl(namespace = "http://rsnag.ch/cm/FinancialAnalysisWrapper/Main-6", name = "financial_analysis_ib")
  public JAXBElement<FinancialAnalysisIB> createFinancialAnalysisIb(FinancialAnalysisIB value) {
    return new JAXBElement<>(_FinancialAnalysisIb_QNAME, FinancialAnalysisIB.class, null, value);
  }

  @XmlElementDecl(namespace = "http://rsnag.ch/cm/FinancialAnalysisWrapper/Main-6", name = "financial_analysis_kp")
  public JAXBElement<FinancialAnalysisKP> createFinancialAnalysisKp(FinancialAnalysisKP value) {
    return new JAXBElement<>(_FinancialAnalysisKp_QNAME, FinancialAnalysisKP.class, null, value);
  }

}

// ----- FinancialAnalysisResponse.java ----- //
@XmlRootElement(name = "financial_analysis_response", namespace = "http://rsnag.ch/cm/ExportFinancialAnalysis/Response-8")
@XmlAccessorType(XmlAccessType.FIELD)
public class FinancialAnalysisResponse {

  @XmlElement(name = "financial_analysis")
  private List<FinancialAnalysisWrapper> financialAnalyses;

  // attributes

  // getters and setters

}

// ----- FinancialAnalysisWrapper.java ----- //
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class FinancialAnalysisWrapper {

  @XmlElement(name = "xml_data", required = true)
  private AbstractFinancialAnalysis financialAnalysisData;

  // attributes

  // getters and setters

}

// ----- AbstractFinancialAnalysis.java ----- //
@XmlAccessorType(XmlAccessType.FIELD)
@XmlSeeAlso({
    FinancialAnalysisKP.class,
    FinancialAnalysisIB.class,
    FinancialAnalysisUG.class
})
public abstract class AbstractFinancialAnalysis {

  // elements and attributes

  // getters and setters

}

// ----- FinancialAnalysisIB.java ----- //
@XmlRootElement
@XmlType(name = "FinancialAnalysisIB")
@XmlAccessorType(XmlAccessType.FIELD)
public class FinancialAnalysisIB extends AbstractFinancialAnalysis {

  // elements

  // getters and setters

}

// ----- FinancialAnalysisKP.java ----- //
@XmlRootElement
@XmlType(name = "FinancialAnalysisKP")
@XmlAccessorType(XmlAccessType.FIELD)
public class FinancialAnalysisKP extends AbstractFinancialAnalysis {

  // elements

  // getters and setters

}

// ----- FinancialAnalysisUG.java ----- //
@XmlRootElement
@XmlType(name = "FinancialAnalysisUG")
@XmlAccessorType(XmlAccessType.FIELD)
public class FinancialAnalysisUG extends AbstractFinancialAnalysis {

  // elements

  // getters and setters

}

据我所知和互联网研究（source），JAXB应该有可能基于属性xsi:type（存在）来决定使用哪种抽象类型的实现。

但是在解组期间出现错误：

[com.sun.istack.SAXParseException2; lineNumber: 1; columnNumber: 608; Unable to create an instance of com.example.application.entity.jaxb.AbstractFinancialAnalysis

我也尝试过类似的事情：

@XmlElements({...})在xml_data元素上，例如this。它几乎可行，但从未选择正确的抽象类实现。
@XmlTransient在抽象类上，例如this。我意识到这是为了其他。

有人可以解释我在做什么错吗？谢谢

编辑

我发现this open issue on github可能遇到了同样的问题。

JAXB无法创建抽象XML类型的实例

编辑

0 个答案: