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jaxbcontext 生成不完整的模式？

发布于 2024-12-26 04:13:00 字数 6226 浏览 4 评论 0原文

我在使用 JAXB 时遇到了一个奇怪的问题。我已经使用 xjc 从 XSD 生成 java 类，一切看起来都不错。如果我使用 schemagen，它会生成与我的原始 xsd 匹配的正确架构。但是，如果我使用 JAXBContext.generateSchema()，则生成的模式不完整。

我使用 Oracle Java 1.6.0_29 和 jaxb-2.2.4-1.jar 作为实现。我附上了 java 代码（生成架构）、下面的 xsd 以及 jaxb 调用的输出。

CalculateBorrowingDataResponse.xsd：

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema 
    version="1.1"
    attributeFormDefault="unqualified" 
    elementFormDefault="qualified"
    targetNamespace="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:lssSt="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse"
    xmlns:cbdRes="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">


    <!-- CalculateBorrowingData -->
    <xsd:complexType name="CalculateBorrowingDataResponseType">
        <xsd:sequence>
            <xsd:element name="loanAgmt" type="cbdRes:LoanAgreementType" minOccurs="1" maxOccurs="1" />
        </xsd:sequence>
    </xsd:complexType>


    <xsd:complexType name="LoanAgreementType">
        <xsd:sequence>
            <xsd:element name="borrowingBasedPmtAmt" type="lssSt:borrowingBasedPmtAmt" minOccurs="0" maxOccurs="1" />
            <xsd:element name="maxPmtAmt" type="lssSt:maxPmtAmt" minOccurs="0" maxOccurs="1" />
            <xsd:element name="borrowingCapacityMin" type="lssSt:borrowingCapacityMin" minOccurs="0" maxOccurs="1" />
            <xsd:element name="borrowingCapacityMax" type="lssSt:borrowingCapacityMax" minOccurs="0" maxOccurs="1" />
            <xsd:element name="propertyValueMinAmt" type="lssSt:propertyValueMinAmt" minOccurs="0" maxOccurs="1" />
            <xsd:element name="propertyValueMaxAmt" type="lssSt:propertyValueMaxAmt" minOccurs="0" maxOccurs="1" />
        </xsd:sequence>
    </xsd:complexType>

    <xsd:element name="calculateBorrowingDataResponse" type="cbdRes:CalculateBorrowingDataResponseType"/>


    <xsd:simpleType name="borrowingBasedPmtAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="maxPmtAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="borrowingCapacityMin">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="borrowingCapacityMax">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="propertyValueMinAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="propertyValueMaxAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>

</xsd:schema>

Java 代码：

    // Creating the XML tree
    JAXBContext jc = JAXBContext.newInstance( CalculateBorrowingDataResponseType.class );
    Unmarshaller u = jc.createUnmarshaller();

    // generate the schemas
    final List<ByteArrayOutputStream> schemaStreams = new ArrayList<ByteArrayOutputStream>();
    jc.generateSchema(new SchemaOutputResolver(){
        @Override
        public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            schemaStreams.add(out);
            StreamResult streamResult = new StreamResult(out);
            streamResult.setSystemId("");
            return streamResult;
        }});

    // convert to a list of string
    List<String> schemas = new ArrayList<String>();
    for( ByteArrayOutputStream os : schemaStreams )
    {
        schemas.add(os.toString());
        System.out.println( os.toString());
    }

jaxbContext.generateSchema() 的输出：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema elementFormDefault="qualified" version="1.0" targetNamespace="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" xmlns:tns="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:complexType name="CalculateBorrowingDataResponseType">
    <xs:sequence>
      <xs:element name="loanAgmt" type="tns:LoanAgreementType"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="LoanAgreementType">
    <xs:sequence>
      <xs:element name="borrowingBasedPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="maxPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMin" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMax" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMinAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMaxAmt" type="xs:decimal" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

如您所见，输出架构非常匹配，保存并保存，只是它缺少calculateBorrowingDataResponse 的元素定义！但是，如果我使用 schemagen， 生成calculateBorrowingDataResponse 元素。

我的 SchemaOutputResolver 设置中是否缺少某些内容或执行了不正确/不完整的操作？或者这是 Jaxb RI 中的一个错误？

原文

I've run into a strange problem with JAXB. I've used xjc to generate my java classes from my XSD and all looks good. If I use schemagen, it produces a proper schema that matches my original xsd. However, if I use JAXBContext.generateSchema(), then the generated schema is incomplete.

I'm using Oracle Java 1.6.0_29 and jaxb-2.2.4-1.jar as the implementation. I'm enclosing the java code (which generates the schema), and the xsd below as well as the output of the jaxb call.

CalculateBorrowingDataResponse.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema 
    version="1.1"
    attributeFormDefault="unqualified" 
    elementFormDefault="qualified"
    targetNamespace="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:lssSt="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse"
    xmlns:cbdRes="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">


    <!-- CalculateBorrowingData -->
    <xsd:complexType name="CalculateBorrowingDataResponseType">
        <xsd:sequence>
            <xsd:element name="loanAgmt" type="cbdRes:LoanAgreementType" minOccurs="1" maxOccurs="1" />
        </xsd:sequence>
    </xsd:complexType>


    <xsd:complexType name="LoanAgreementType">
        <xsd:sequence>
            <xsd:element name="borrowingBasedPmtAmt" type="lssSt:borrowingBasedPmtAmt" minOccurs="0" maxOccurs="1" />
            <xsd:element name="maxPmtAmt" type="lssSt:maxPmtAmt" minOccurs="0" maxOccurs="1" />
            <xsd:element name="borrowingCapacityMin" type="lssSt:borrowingCapacityMin" minOccurs="0" maxOccurs="1" />
            <xsd:element name="borrowingCapacityMax" type="lssSt:borrowingCapacityMax" minOccurs="0" maxOccurs="1" />
            <xsd:element name="propertyValueMinAmt" type="lssSt:propertyValueMinAmt" minOccurs="0" maxOccurs="1" />
            <xsd:element name="propertyValueMaxAmt" type="lssSt:propertyValueMaxAmt" minOccurs="0" maxOccurs="1" />
        </xsd:sequence>
    </xsd:complexType>

    <xsd:element name="calculateBorrowingDataResponse" type="cbdRes:CalculateBorrowingDataResponseType"/>


    <xsd:simpleType name="borrowingBasedPmtAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="maxPmtAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="borrowingCapacityMin">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="borrowingCapacityMax">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="propertyValueMinAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>
    <xsd:simpleType name="propertyValueMaxAmt">
        <xsd:restriction base="xsd:decimal" >
        <xsd:totalDigits value="19" />
        <xsd:fractionDigits value="4" />
        </xsd:restriction>
    </xsd:simpleType>

</xsd:schema>

Java code:

    // Creating the XML tree
    JAXBContext jc = JAXBContext.newInstance( CalculateBorrowingDataResponseType.class );
    Unmarshaller u = jc.createUnmarshaller();

    // generate the schemas
    final List<ByteArrayOutputStream> schemaStreams = new ArrayList<ByteArrayOutputStream>();
    jc.generateSchema(new SchemaOutputResolver(){
        @Override
        public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            schemaStreams.add(out);
            StreamResult streamResult = new StreamResult(out);
            streamResult.setSystemId("");
            return streamResult;
        }});

    // convert to a list of string
    List<String> schemas = new ArrayList<String>();
    for( ByteArrayOutputStream os : schemaStreams )
    {
        schemas.add(os.toString());
        System.out.println( os.toString());
    }

Output of jaxbContext.generateSchema():

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema elementFormDefault="qualified" version="1.0" targetNamespace="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" xmlns:tns="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:complexType name="CalculateBorrowingDataResponseType">
    <xs:sequence>
      <xs:element name="loanAgmt" type="tns:LoanAgreementType"/>
    </xs:sequence>
  </xs:complexType>

  <xs:complexType name="LoanAgreementType">
    <xs:sequence>
      <xs:element name="borrowingBasedPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="maxPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMin" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMax" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMinAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMaxAmt" type="xs:decimal" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

As you can see, the output schema matches very closely, save and except that it is missing the element definition of calculateBorrowingDataResponse! If I use schemagen, however, the
calculateBorrowingDataResponse element is generated.

Am I missing something in my SchemaOutputResolver setup or doing something incorrect/incomplete? Or is this a bug in the Jaxb RI?

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评论（3）

美羊羊 2025-01-02 04:13:00

JAXB 的更改

JAXBContext.newInstance(CalculateBorrowingDataResponseType.class);

对

JAXBContext.newInstance(CalculateBorrowingDataResponseType.class.getPackage().getName());

需要上述类包内的 package-info.java 文件（由 xjc 从 XSD 生成）中定义的信息。

它不会创建相关的 XSD 元素，因为 CalculateBorrowingDataResponseType 没有 @XmlRootElement 注释。

为什么xjc不从一开始就创建一个？请参阅互联网上最权威的解释 关于此事。

如果您向 JAXBContext.newInstance(...) 提供包名称，为什么您的代码会生成上述元素，即使 CalculateBorrowingDataResponseType 仍然缺少 @XmlRootAnnotation< /代码>? 我还没有任何想法！ 现在我有了！

Change

JAXBContext.newInstance(CalculateBorrowingDataResponseType.class);

to

JAXBContext.newInstance(CalculateBorrowingDataResponseType.class.getPackage().getName());

JAXB needs the information defined in the package-info.java file (generated by xjc from your XSD) inside the above class' package.

It doesn't creates the XSD element in question, because CalculateBorrowingDataResponseType doesn't have an @XmlRootElement annotation.

Why didn't xjc create one from the beginning? See the most authoritative explanation on the Internets regarding this matter.

And why does your code generates the aforementioned element if you supply a package name to JAXBContext.newInstance(...) even though CalculateBorrowingDataResponseType still missing the @XmlRootAnnotation? I haven't got the faintest idea! Now I have!

回复 原文
埖埖迣鎅 2025-01-02 04:13:00

生成的 ObjectFactory 类中的以下内容是导致生成该元素的原因：

@XmlElementDecl(namespace = "http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse", name = "calculateBorrowingDataResponse")
public JAXBElement<CalculateBorrowingDataResponseType> createCalculateBorrowingDataResponse(CalculateBorrowingDataResponseType value) {
    return new JAXBElement<CalculateBorrowingDataResponseType>(_CalculateBorrowingDataResponse_QNAME, CalculateBorrowingDataResponseType.class, null, value);
}

为了让 JAXBContext 处理 ObjectFactory 类，您需要将其包含在类数组中传递以创建 JAXBContext：

JAXBContext jc = JAXBContext.newInstance(CalculateBorrowingDataResponseType.class, ObjectFactory.class);

或者在生成的类的包名称上创建 JAXBContext：

String contextPath = CalculateBorrowingDataResponseType.class.getPackage().getName();
JAXBContext jc = JAXBContext.newInstance(contextPath);

完整示例

package forum8809406;

import java.io.IOException;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.SchemaOutputResolver;
import javax.xml.transform.Result;
import javax.xml.transform.stream.StreamResult;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance("forum8809406");
        jc.generateSchema(new SOR());
    }

    private static class SOR extends SchemaOutputResolver {

        @Override
        public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
            StreamResult result = new StreamResult(System.out);
            result.setSystemId(suggestedFileName);
            return result;
        }

    }

}

我得到以下生成的 XML 模式，其中包含 calculateBorrowingDataResponse 元素：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema 
    version="1.0" 
    elementFormDefault="qualified" 
    targetNamespace="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:tns="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:complexType name="CalculateBorrowingDataResponseType">
    <xs:sequence>
      <xs:element name="loanAgmt" type="tns:LoanAgreementType"/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="LoanAgreementType">
    <xs:sequence>
      <xs:element name="borrowingBasedPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="maxPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMin" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMax" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMinAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMaxAmt" type="xs:decimal" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="calculateBorrowingDataResponse" type="tns:CalculateBorrowingDataResponseType"/>
</xs:schema>

The following from the generated ObjectFactory class is what causes that element to be generated:

@XmlElementDecl(namespace = "http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse", name = "calculateBorrowingDataResponse")
public JAXBElement<CalculateBorrowingDataResponseType> createCalculateBorrowingDataResponse(CalculateBorrowingDataResponseType value) {
    return new JAXBElement<CalculateBorrowingDataResponseType>(_CalculateBorrowingDataResponse_QNAME, CalculateBorrowingDataResponseType.class, null, value);
}

In order to have the ObjectFactory class processed by the JAXBContext you either need to included in array of classes passed to create the JAXBContext:

JAXBContext jc = JAXBContext.newInstance(CalculateBorrowingDataResponseType.class, ObjectFactory.class);

Or to create the JAXBContext on the package name of the generated classes:

String contextPath = CalculateBorrowingDataResponseType.class.getPackage().getName();
JAXBContext jc = JAXBContext.newInstance(contextPath);

Full Example

package forum8809406;

import java.io.IOException;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.SchemaOutputResolver;
import javax.xml.transform.Result;
import javax.xml.transform.stream.StreamResult;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance("forum8809406");
        jc.generateSchema(new SOR());
    }

    private static class SOR extends SchemaOutputResolver {

        @Override
        public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
            StreamResult result = new StreamResult(System.out);
            result.setSystemId(suggestedFileName);
            return result;
        }

    }

}

I get the following generated XML schema, that contains the calculateBorrowingDataResponse element:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema 
    version="1.0" 
    elementFormDefault="qualified" 
    targetNamespace="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:tns="http://www.domain.com/ClientServices/LendingSimulation/CalculateBorrowingDataResponse" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:complexType name="CalculateBorrowingDataResponseType">
    <xs:sequence>
      <xs:element name="loanAgmt" type="tns:LoanAgreementType"/>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name="LoanAgreementType">
    <xs:sequence>
      <xs:element name="borrowingBasedPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="maxPmtAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMin" type="xs:decimal" minOccurs="0"/>
      <xs:element name="borrowingCapacityMax" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMinAmt" type="xs:decimal" minOccurs="0"/>
      <xs:element name="propertyValueMaxAmt" type="xs:decimal" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="calculateBorrowingDataResponse" type="tns:CalculateBorrowingDataResponseType"/>
</xs:schema>
回复 原文
—━☆沉默づ 2025-01-02 04:13:00

为什么您认为在 roundrip 'schema1->XJC->schema2' 中 schema1 和 schema 2 应该相同？您是否有 XJC 为“calculateBorrowingDataResponse”元素生成的 Java 类？我不这么认为 - 那么你会如何期望它出现在生成的模式中？

Why do you think that in roundrip 'schema1->XJC->schema2' schema1 and schema 2 should be identical? Do you have Java class generated for 'calculateBorrowingDataResponse' element by XJC? I don't think so - how would you expect it to be in generated schema then?

回复 原文
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