JAXB Eclipse Link Moxy：ClassCastException，同时使用模式验证解组JSON

时间：2013-09-16 09:48:05

标签： eclipselink moxy

我使用eclipse链接（v2.5.1）动态JAXB将XML转换为JSON，反之亦然使用多个模式。在将JSON编组为XML时，我希望验证JSON（针对XSD），而动态Moxy无法验证生成的JSON并导致转发异常。

emp.xsd 

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:emp="Employee:2:0" targetNamespace="Employee:2:0"
    elementFormDefault="unqualified" attributeFormDefault="unqualified"
    version="2.0">

    <xsd:element name="searchManager" type="emp:SearchManager" />

    <xsd:complexType name="SearchManager">
        <xsd:sequence>
            <xsd:element name="CompanyName" type="xsd:string" />
            <xsd:element name="objects" type="emp:Employee" minOccurs="0" maxOccurs="unbounded" />
        </xsd:sequence>
    </xsd:complexType>


    <xsd:complexType name="Employee">

        <xsd:complexContent>
            <xsd:extension base="emp:Organization">
                <xsd:sequence>
                   <xsd:element name="EmpId" type="xsd:string" minOccurs="0" />
                </xsd:sequence>
            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>

    <xsd:complexType name="Projects">
        <xsd:complexContent>
            <xsd:extension base="emp:Organization"/>
        </xsd:complexContent>
    </xsd:complexType>

    <xsd:complexType name="Organization">
        <xsd:annotation>
            <xsd:documentation>Abstract base class </xsd:documentation>
        </xsd:annotation>
    </xsd:complexType>
</xsd:schema>

Manager.xsd 

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema targetNamespace="Manager:1:0" xmlns:emp="Employee:2:0"
    xmlns:manager="Manager:1:0" xmlns="http://www.w3.org/2001/XMLSchema"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema"
    elementFormDefault="unqualified" attributeFormDefault="unqualified"
    version="1.0">
    <!-- schema imports -->
    <xs:import namespace="Employee:2:0" schemaLocation="emp.xsd" />

    <xs:complexType name="Manager">
        <xs:annotation>
            <xs:documentation>
                Definition of class Employee
            </xs:documentation>
        </xs:annotation>
        <xs:complexContent>
            <xs:extension base="emp:Employee">
                <xs:sequence>
                    <xs:element name="teamSize" type="xsd:int" minOccurs="0" />
                    <xs:element name="project1" type="manager:Project1"
                        minOccurs="0" maxOccurs="unbounded" />
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>


    <xs:complexType name="Project1">
        <xs:complexContent>
            <xs:extension base="manager:Developement">
                <xs:sequence>
                    <xs:element name="type" type="xsd:int" minOccurs="0" />
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
    <xs:complexType name="Developement">
        <xs:annotation>
            <xs:documentation>
                Abstract base class for an Development
            </xs:documentation>
        </xs:annotation>
        <xs:complexContent>
            <xs:extension base="emp:Projects"/>
        </xs:complexContent>
    </xs:complexType>
</xs:schema>

sample.xml中

<emp:searchManager xmlns:emp="Employee:2:0"
    xmlns:manager="Manager:1:0">
    <CompanyName>Test</CompanyName>
    <objects xmlns:ns2="Manager:1:0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ns2:Manager">
        <EmpId>123456</EmpId>
        <teamSize>10</teamSize>
        <project1>
            <type>1</type>
        </project1>
    </objects>
</emp:searchManager>

要测试的驱动程序如下

public class XMLToJSON {

    /**
     * @param args
     */
    public static void main(String[] args) {

        FileInputStream xsdInputStream;
        try {
            xsdInputStream = new FileInputStream("Manager.xsd");
            DynamicJAXBContext jaxbContext = DynamicJAXBContextFactory.createContextFromXSD(xsdInputStream, new MyEntityResolver(), null, null);
            FileInputStream xmlInputStream = new FileInputStream("sample.xml");
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
            JAXBElement<DynamicEntity> manager = (JAXBElement) unmarshaller.unmarshal(xmlInputStream);


            Marshaller marshaller = jaxbContext.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            //input xml to print
            marshaller.marshal(manager, System.out);

            Map namespaces = new HashMap();
            namespaces.put("http://www.w3.org/2001/XMLSchema-instance", "xsi");
            namespaces.put("Employee:2:0", "ns1"); 
            namespaces.put("Manager:1:0", "ns2");

            // XML to JSON
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json");
            marshaller.setProperty(MarshallerProperties.NAMESPACE_PREFIX_MAPPER, namespaces);
            FileOutputStream jsonOutputStream = new FileOutputStream("sample.json");
            marshaller.marshal(manager, jsonOutputStream);
            marshaller.marshal(manager, System.out);

            //JSON to XML
            JAXBUnmarshaller jsonUnmarshaller = jaxbContext.createUnmarshaller();
            jsonUnmarshaller.setProperty(UnmarshallerProperties.MEDIA_TYPE, "application/json");
            jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_NAMESPACE_PREFIX_MAPPER, namespaces);
            jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_INCLUDE_ROOT, true);
            jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_ATTRIBUTE_PREFIX, "@");
            SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); 
            Schema schema = sf.newSchema(new File("Manager.xsd")); 
            jsonUnmarshaller.setSchema(schema);
            StreamSource json = new StreamSource("sample.json");
            JAXBElement<DynamicEntity> myroot = (JAXBElement) jsonUnmarshaller.unmarshal(json);
            Marshaller m = jaxbContext.createMarshaller();
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
            m.marshal(myroot, System.out);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

生成的样本JSON 

    {
   "ns1.searchManager" : {
      "CompanyName" : "Test",
      "objects" : [ {
         "xsi.type" : "ns2.Manager",
         "EmpId" : "123456",
         "teamSize" : 10,
         "project1" : [ {
            "type" : 1
         } ]
      } ]
   }
}

虽然看到了解组下面的例外

Exception in thread "main" java.lang.ClassCastException: org.eclipse.persistence.internal.oxm.record.XMLReaderAdapter$ExtendedContentHandlerAdapter cannot be cast to org.eclipse.persistence.internal.oxm.record.UnmarshalRecord
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.isTextValue(JSONReader.java:454)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:350)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:244)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:430)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:299)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:166)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:125)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:140)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:778)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:666)
    at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:593)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:287)
    at XMLToJSON.main(XMLToJSON.java:74)

编辑：更正了生成的样本json

问题

目的是检查JSON是否符合XML模式。动态JAXB在解组时是否支持JSON验证？这是动态JAXB Moxy中的错误吗？

1 个答案:

答案 0 :(得分：1)

注意：我是EclipseLink JAXB (MOXy)主管，是JAXB (JSR-222)专家组的成员。

您正在尝试在2.5.1（和2.6.0）流中修复的以下问题。

从2013年9月11日开始的每晚版本的EclipseLink 2.5.1（和2.6.0）中可以从以下链接获得该修复程序：

架构验证和JSON解组

由于我们需要处理JSON文档，因此无法保证针对XML模式验证JSON输入。以下是获得ClassCastException修正后您将获得的例外情况。

javax.xml.bind.UnmarshalException
 - with linked exception:
[Exception [EclipseLink-25004] (Eclipse Persistence Services - @VERSION@.@QUALIFIER@): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: An error occurred unmarshalling the document
Internal Exception: org.xml.sax.SAXParseException; cvc-complex-type.2.4.d: Invalid content was found starting with element 'teamSize'. No child element is expected at this point.]
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.handleXMLMarshalException(JAXBUnmarshaller.java:980)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:290)
    at forum18824990.XMLToJSON.main(XMLToJSON.java:63)
Caused by: Exception [EclipseLink-25004] (Eclipse Persistence Services - @VERSION@.@QUALIFIER@): org.eclipse.persistence.exceptions.XMLMarshalException
Exception Description: An error occurred unmarshalling the document
Internal Exception: org.xml.sax.SAXParseException; cvc-complex-type.2.4.d: Invalid content was found starting with element 'teamSize'. No child element is expected at this point.
    at org.eclipse.persistence.exceptions.XMLMarshalException.unmarshalException(XMLMarshalException.java:115)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:144)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:784)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:666)
    at org.eclipse.persistence.internal.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:566)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:287)
    ... 1 more
Caused by: org.xml.sax.SAXParseException; cvc-complex-type.2.4.d: Invalid content was found starting with element 'teamSize'. No child element is expected at this point.
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:437)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:325)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:453)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3232)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1795)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:741)
    at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.startElement(ValidatorHandlerImpl.java:565)
    at org.eclipse.persistence.internal.oxm.record.XMLReader$ValidatingContentHandler.startElement(XMLReader.java:431)
    at org.eclipse.persistence.internal.oxm.record.XMLReaderAdapter$ExtendedContentHandlerAdapter.startElement(XMLReaderAdapter.java:178)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:302)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:436)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:418)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:244)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:436)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:303)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:166)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:125)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:140)
    ... 5 more
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