com.fasterxml.jackson.databind.exc.InvalidDefinitionException：无法构造`javax.xml.bind.JAXBElement`的实例答案

【问题标题】：com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `javax.xml.bind.JAXBElement`com.fasterxml.jackson.databind.exc.InvalidDefinitionException：无法构造`javax.xml.bind.JAXBElement`的实例
【发布时间】：2020-03-08 21:36:05
【问题描述】：

我目前正在尝试将来自 JSON 请求的请求直接映射到 XML 定义。想法是我有一个使用 SOAP 服务并将它们公开为 RESTful 服务的 Spring Boot 应用程序；

下面是SOAP绑定类定义；


@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "log",
    "pass",
    "idNumber",
    "serialNumber"
})
@XmlRootElement(name = "GetDataByIdCard")
public class GetDataByIdCard {

    @XmlElementRef(name = "log", namespace = "http://tempuri.org/", type = JAXBElement.class, required = false)
    protected JAXBElement<String> log;
    @XmlElementRef(name = "pass", namespace = "http://tempuri.org/", type = JAXBElement.class, required = false)
    protected JAXBElement<String> pass;
    @XmlElementRef(name = "id_number", namespace = "http://tempuri.org/", type = JAXBElement.class, required = false)
    protected JAXBElement<String> idNumber;
    @XmlElementRef(name = "serial_number", namespace = "http://tempuri.org/", type = JAXBElement.class, required = false)
    protected JAXBElement<String> serialNumber;

    /**
     * Gets the value of the log property.
     * 
     * @return
     *     possible object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public JAXBElement<String> getLog() {
        return log;
    }

    /**
     * Sets the value of the log property.
     * 
     * @param value
     *     allowed object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public void setLog(JAXBElement<String> value) {
        this.log = value;
    }

    /**
     * Gets the value of the pass property.
     * 
     * @return
     *     possible object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public JAXBElement<String> getPass() {
        return pass;
    }

    /**
     * Sets the value of the pass property.
     * 
     * @param value
     *     allowed object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public void setPass(JAXBElement<String> value) {
        this.pass = value;
    }

    /**
     * Gets the value of the idNumber property.
     * 
     * @return
     *     possible object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public JAXBElement<String> getIdNumber() {
        return idNumber;
    }

    /**
     * Sets the value of the idNumber property.
     * 
     * @param value
     *     allowed object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public void setIdNumber(JAXBElement<String> value) {
        this.idNumber = value;
    }

    /**
     * Gets the value of the serialNumber property.
     * 
     * @return
     *     possible object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public JAXBElement<String> getSerialNumber() {
        return serialNumber;
    }

    /**
     * Sets the value of the serialNumber property.
     * 
     * @param value
     *     allowed object is
     *     {@link JAXBElement }{@code <}{@link String }{@code >}
     *     
     */
    public void setSerialNumber(JAXBElement<String> value) {
        this.serialNumber = value;
    }

}

下面是我的控制器；

@Autowired
private IPRSClient client;

@PostMapping("/getbyId")
public GetDataByIdCardResponse invokeGetbyIdCard(@RequestBody GetDataByIdCard IdCardRequest) {

    return client.getById(IdCardRequest);
}

当我执行发布请求时，我收到以下错误日志；

2019-11-13 08:51:12.829 ERROR 21148 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class javax.xml.bind.JAXBElement]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `javax.xml.bind.JAXBElement` (no Creators, like default construct, exist): no String-argument constructor/factory method to deserialize from String value ('RES')
 at [Source: (PushbackInputStream); line: 2, column: 8] (through reference chain: com.iprs.soap.api.bindingclasses.GetDataByIdCard["log"])] with root cause

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `javax.xml.bind.JAXBElement` (no Creators, like default construct, exist): no String-argument constructor/factory method to deserialize from String value ('RES')
 at [Source: (PushbackInputStream); line: 2, column: 8] (through reference chain: com.iprs.soap.api.bindingclasses.GetDataByIdCard["log"])
    at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1589) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1055) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.ValueInstantiator._createFromStringFallbacks(ValueInstantiator.java:371) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:323) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromString(BeanDeserializerBase.java:1373) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:171) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:161) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:129) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:369) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4202) ~[jackson-databind-2.10.0.jar:2.10.0]
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3258) ~[jackson-databind-2.10.0.jar:2.10.0]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:239) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:227) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:205) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:158) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:131) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.1.RELEASE.jar:5.2.1.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_221]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_221]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.27.jar:9.0.27]
    at java.lang.Thread.run(Unknown Source) [na:1.8.0_221]

我正在寻找的理想结果是对我的 RESTful 服务执行 Post 请求并将其映射到 XML 服务；当我尝试这个时，JAXBElement 被证明是一个挑战。

编辑我已经尝试使用我自己的自定义类进行映射，如下所示；


public class IdCardCredentials {

    public IdCardCredentials() {
        // TODO Auto-generated constructor stub
    }

    @JsonProperty("log")
    private String log;
    @JsonProperty("pass")
    private String pass;
    @JsonProperty("id_Number")
    private String idNumber;
    @JsonProperty("serialNumber")
    private String serialNumber;

    public String getLog() {
        return log;
    }
    public void setLog(String log) {
        this.log = log;
    }
    public String getPass() {
        return pass;
    }
    public void setPass(String pass) {
        this.pass = pass;
    }
    public String getIdNumber() {
        return idNumber;
    }
    public void setIdNumber(String idNumber) {
        this.idNumber = idNumber;
    }
    public String getSerialNumber() {
        return serialNumber;
    }
    public void setSerialNumber(String serialNumber) {
        this.serialNumber = serialNumber;
    }

}

我还将控制器更新为以下定义；


@SpringBootApplication
@RestController
public class IprsWsClientApplication {

    @Autowired
    private IPRSClient client;
    @Autowired
    private ModelMapper modelMapper;

    @Bean
    public ModelMapper modelMapper() {
        return new ModelMapper();
    }

    @PostMapping("/getbyId")
    public GetDataByIdCardResponse invokeGetbyIdCard(@RequestBody IdCardCredentials IdCardRequest) {
        ObjectMapper mapper = new ObjectMapper();

        System.out.println(IdCardRequest.getIdNumber() + "------ID NUMBER-----");

        GetDataByIdCard IdcardReq = modelMapper.map(IdCardRequest, GetDataByIdCard.class);

        System.out.println(IdcardReq.getIdNumber() + "------REAL ID NUMBER-----");

        return client.getById(IdcardReq);
    }

    public static void main(String[] args) {
        SpringApplication.run(IprsWsClientApplication.class, args);
    }

}

但是映射器没有适当地分配值；也就是说所有的值都是空的。我正在寻找一种可以将值映射到此 SOAP 类定义的方法。

【问题讨论】：

你有@XmlElementRef而不是普通的@XmlElement有什么具体原因吗？使用后者，您不必使用不必要的JAXBElement<String> 包装器，而只需使用String。问题在于JAXBElement 为您似乎不需要的 XML 类型添加了不必要的强耦合——Java String 比包装器更简单。这也是 Jackson 的问题：它不处理 JAXB/XML 特定类型，尽管它确实理解 JAXB 注释。
我使用的 API 是遗留代码；代码库不在我的控制范围内；我使用XJC 工具和jaxb2-maven-plugin 生成了Java Binding 类
你可以在这里找到答案stackoverflow.com/a/62383318/11486142

标签： java json spring-boot jaxb

【解决方案1】：

我想出了一个很长的时间来解决这个问题；我没有使用ModelMapper，而是改为ObjectFactory，如下所示；

@PostMapping("/getbyId")
public GetDataByIdCardResponse invokeGetbyIdCard(@RequestBody IdCardCredentials IdCardRequest) {

    ObjectFactory factory = new ObjectFactory();


    GetDataByIdCard IdcardReq = new GetDataByIdCard();

    JAXBElement<String> idNo = factory.createGetDataByIdCardIdNumber(IdCardRequest.getIdNumber());
    JAXBElement<String> log = factory.createGetDataByIdCardLog(IdCardRequest.getLog());
    JAXBElement<String> pass = factory.createGetDataByIdCardPass(IdCardRequest.getPass());


    IdcardReq.setLog(log);
    IdcardReq.setPass(pass);
    IdcardReq.setPass(idNo);

    return client.getById(IdcardReq);
}

即使它不是理想的，它也可以工作。

【讨论】：