jaxbcontext生成不完整的模式？ [英] jaxbcontext generating incomplete schemas?
问题描述
我遇到了JAXB的一个奇怪问题。我用xjc从我的XSD生成我的java类，看起来很好看。如果我使用schemagen，它会生成一个与原始xsd匹配的正确模式。但是，如果我使用JAXBContext.generateSchema（），则生成的模式不完整。
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.
我正在使用Oracle Java 1.6.0_29和jaxb-2.2.4-1 .jar作为实现。我正在附上java代码（生成模式），以及下面的xsd以及jaxb调用的输出。
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：
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：
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>
如您所见，输出模式非常接近，保存并且除了它缺少元素calculateBorrowingDataResponse的定义！但是，如果我使用schemagen，则会生成
calculateBorrowingDataResponse元素。
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.
我在SchemaOutputResolver设置中遗漏了什么或者做了不正确/不完整的事情？或者这是Jaxb RI中的错误？
Am I missing something in my SchemaOutputResolver setup or doing something incorrect/incomplete? Or is this a bug in the Jaxb RI?
推荐答案
更改
JAXBContext.newInstance(CalculateBorrowingDataResponseType.class);
到
JAXBContext.newInstance(CalculateBorrowingDataResponseType.class.getPackage().getName());
JAXB需要 package-info.java中定义的信息文件（由你的XSD中的 xjc 生成）在上面的类'包中。
JAXB needs the information defined in the package-info.java file (generated by xjc from your XSD) inside the above class' package.
它没有不会创建有问题的XSD元素，因为 CalculateBorrowingDataResponseType 没有 @XmlRootElement 注释。
It doesn't creates the XSD element in question, because CalculateBorrowingDataResponseType doesn't have an @XmlRootElement annotation.
为什么 xjc 从头开始创建一个？请参阅关于 Internets的最权威解释关于此事。
Why didn't xjc create one from the beginning? See the most authoritative explanation on the Internets regarding this matter.
如果您为 JAXBContext.newInstance提供包名，为什么您的代码会生成上述元素？ ...）即使 CalculateBorrowingDataResponseType 仍然缺少 @XmlRootAnnotation ？ 我没有最微弱的想法！ 现在我有了！
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!
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