Apache Camel JAXB反编组在从Camel从2.20.4升级到2.21.2或2.22.1后返回null属性

Question

在将Apache Camel从2.20.4升级到2.21.2甚至2.22.1之后，我的单元测试失败了，我不知道为什么。

我有一个接收XML响应的路由，我希望将其解封到一个数据类中。这在Apache Camel 2.21.2之后失败。

JAXB上下文知道给定包中的所有数据类，并选择正确的类。创建了正确的对象本身，但属性保持为NULL。在调试SAX解析器时，SAX解析器似乎故意忽略了标记之间的文本。

@Component
public class NewsletterRoute extends RouteBuilder {

8<-------------------------------------------------

@Override
public void configure() {
    final DataFormat marshalFormat =
        new JacksonDataFormat(HybrisRequest.class);
    final JaxbDataFormat unmarshalFormat = new JaxbDataFormat();
    unmarshalFormat.setContextPath(
       SuccessResponse.class.getPackage().getName());

    from(URI)
        .routeId("subscribeRoute")
        // Fetch the auth token to send it as 'x-csrf-token' header.
        .setHeader(Exchange.HTTP_URI,
            method(this.backendUrlProvider, "getUrl"))
        .setHeader(Exchange.HTTP_PATH,
             constant(this.subscribeUnsubscribePath))
        .setHeader(Exchange.HTTP_METHOD, HttpMethods.POST)
        .setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
        // Marshal body to JSON
        .marshal(marshalFormat)
        .to(String.format("https4:backend" +
                "?sslContextParameters=hybrisSslContextParams" +
                "&x509HostnameVerifier=hybrisHostnameVerifier" +
                // don't throw on 3XX/4XX/5XX since
                // we need the response body 
                "&throwExceptionOnFailure=false" +
                "&cookieStore=#hybrisCookieStore" +
                "&authUsername=%s" +
                "&authPassword=%s" +
                "&authenticationPreemptive=true" +
                "&httpClient.redirectsEnabled=true" +
                "&httpClient.maxRedirects=3" +
                "&httpClient.connectTimeout=%d" +
                "&httpClient.socketTimeout=%d",
            "RAW(" + username + ")",
            "RAW(" + password + ")",
            backendTimeoutMillis,
            backendTimeoutMillis))
        .convertBodyTo(String.class)
        // Store the received response as property before
        // trying to unmarshal it
        .setProperty(PROPERTY_RESPONSE_RAW, body())
        .unmarshal(unmarshalFormat);
    // @formatter:on
    }
}

@XmlRootElement(name = "entry", namespace = "http://www.w3.org/2005/Atom")
public class SuccessResponse {
    private String id;
    private String title;
    public String getId() { return id; }
    public void setId(String id) { this.id = id; }
    public String getTitle() { return title; }
    public void setTitle(String title) { this.title = title; }
    public String toString() { /*code cut out*/}
}

单元测试只是向Mockito发送一个有效的请求，Mockito返回XML。

<?xml version="1.0" encoding="utf-8"?>
<entry xml:base="https://xxx.xxx.xxx.xxx:44380/sap/opu/odata/sap/CUAN_IMPORT_SRV/"
    xmlns="http://www.w3.org/2005/Atom"
    xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"
    xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices">  
<!-- 8<---------- Code cut out here ----------------------------------- --> 
    <id>bla</id>
    <title type="text">blub</title>
</entry>

有什么想法吗？camel-jaxb中的Bug？

Answer 1

我创建了自定义dataformat，并使用更严格的封送器和unmarhaller来捕捉这种类型的错误。它可以帮助你找到真正的原因。

import org.apache.camel.converter.jaxb.JaxbDataFormat;

import javax.xml.bind.*;

public class StrictJaxbDataFormat extends JaxbDataFormat {

    @Override
    protected Unmarshaller createUnmarshaller() throws JAXBException {
        Unmarshaller unmarshaller = super.createUnmarshaller();
        unmarshaller.setEventHandler(new StrictValidationEventHandler());
        return unmarshaller;
    }

    @Override
    protected Marshaller createMarshaller() throws JAXBException {
        Marshaller marshaller = super.createMarshaller();
        marshaller.setEventHandler(new StrictValidationEventHandler());
        return marshaller;
    }

    private static class StrictValidationEventHandler implements ValidationEventHandler {
        @Override
        public boolean handleEvent(ValidationEvent event) {
            return false; // all validation events should throw exception
        }
    }
}

将JAXBDataFormat替换为StrictJAXBDataFormat

final StrictJaxbDataFormat unmarshalFormat = new StrictJaxbDataFormat();

我尝试模拟您的代码，它的行为与您所描述的完全一致(ID和title为空）。当我添加StrictJAXBDataFormat时，它会抛出javax.xml.bind.unmarshalException：意外元素（URI：“http://www.w3.org/2005/atom”,local：“id”）。预期的元素是<{}id>、<{}title>，所以这个问题可能是JAXB反编组错误：预期的元素是<{}root>，您应该将package-info.java添加到您的JAXB类包中。

@XmlSchema(namespace = "http://www.w3.org/2005/Atom", elementFormDefault = XmlNsForm.QUALIFIED)
package your.package;
import javax.xml.bind.annotation.XmlNsForm;
import javax.xml.bind.annotation.XmlSchema;