动态 JAXB/MOXy 编组抛出 MOXy BV：无法配置构面生成

Question

我正在尝试遵循documentation 并实施Dynamic JAXB/Moxy marshalling。但它没有按预期工作并引发以下错误：

[EL Warning]: moxy: 2021-05-28 10:54:09.432--MOXy BV: Facets generation could not be configured. EclipseLink's JavaModelInputImpl was not detected, instead JavaModelInput is of class: class org.eclipse.persistence.jaxb.javamodel.xjc.XJCJavaModelInputImpl
Exception in thread "main" java.lang.NullPointerException

我的XSD 位于resources 文件夹中，我正在使用documentation 中的XSD。阅读后，我试图在旅途中为它创建POJO，并使用编组方法创建 XML。以下是它的代码：

import org.eclipse.persistence.dynamic.DynamicEntity;
import org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext;
import org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContextFactory;

import jakarta.xml.bind.JAXBException;
import jakarta.xml.bind.Marshaller;

public class Demo {

    public static void main(String[] args) throws JAXBException {
        final ClassLoader classLoader = Demo.class.getClassLoader();
        final InputStream xsd = classLoader.getResourceAsStream("customer.xsd");
        //final InputStream xml = classLoader.getResourceAsStream("customer.xml");

        Map<String, Object> properties = new HashMap<String, Object>(1);
        properties.put("eclipselink.beanvalidation.facets", true);

        System.setProperty("com.sun.tools.xjc.api.impl.s2j.SchemaCompilerImpl.noCorrectnessCheck", "true");
        final DynamicJAXBContext jaxbContext = DynamicJAXBContextFactory.createContextFromXSD(xsd, null, classLoader, properties);
        DynamicEntity customer = jaxbContext.newDynamicEntity("org.JaxBDynamic.Customer");
        DynamicEntity address = jaxbContext.newDynamicEntity("org.JaxBDynamic.Address");
        customer.set("name", "Jane Doe");
        address.set("street", "1 Any Street").set("city", "Any Town");
        customer.set("address", address);
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(customer, System.out);
    }
}

我在pom.xml 中关注了dependency：

<dependency>
    <groupId>jakarta.xml.bind</groupId>
    <artifactId>jakarta.xml.bind-api</artifactId>
    <version>3.0.1</version>
</dependency>

<dependency>
    <groupId>org.eclipse.persistence</groupId>
    <artifactId>eclipselink</artifactId>
    <version>3.0.0</version>
</dependency>

<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-xjc</artifactId>
    <version>3.0.2-b01</version>
</dependency>

运行时出现以下错误：

[EL Warning]: moxy: 2021-05-28 10:54:09.432--MOXy BV: Facets generation could not be configured. EclipseLink's JavaModelInputImpl was not detected, instead JavaModelInput is of class: class org.eclipse.persistence.jaxb.javamodel.xjc.XJCJavaModelInputImpl
Exception in thread "main" java.lang.NullPointerException
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.preProcessXmlAccessorType(AnnotationsProcessor.java:1628)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.preBuildTypeInfo(AnnotationsProcessor.java:603)
    at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processClassesAndProperties(AnnotationsProcessor.java:304)
    at org.eclipse.persistence.jaxb.compiler.Generator.<init>(Generator.java:115)
    at org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext$SchemaContextInput.createContextState(DynamicJAXBContext.java:350)
    at org.eclipse.persistence.jaxb.JAXBContext.<init>(JAXBContext.java:206)
    at org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContext.<init>(DynamicJAXBContext.java:85)
    at org.eclipse.persistence.jaxb.dynamic.DynamicJAXBContextFactory.createContextFromXSD(DynamicJAXBContextFactory.java:281)
    at com.JaxBDynamic.Demo.main(Demo.java:25)

我不确定出了什么问题，因为我正在按照documentation 中提到的步骤进行操作。我找不到与此问题相关的任何内容，因此在此处发布以获得一些反馈。

Answer 1

正如您所写，您正在尝试按照文档实现 JAXB，但您链接的文档适用于 EclipseLink 2.5 版，并且您遇到了 EL v2.6 中添加的功能的问题。当前的稳定版本是 3.0.0，您正在运行，基于您的 pom.xml。

查看 EL 的更新文档。由于主页上没有您遇到问题的功能的文档链接，您可以在此处找到它： https://wiki.eclipse.org/EclipseLink/Examples/MOXy/BVinJAXB 和概念介绍here。

Answer 2

解决方案

消息

"[EL Warning]: moxy: 2022-01-06 14:59:32.0--MOXy BV: Facets generation could not be configured. EclipseLink's JavaModelInputImpl was not detected, instead..."

不对 NullPointerException 负责，因此，这不是问题。除此之外，使用 Eclipselink moxy 和 jasb-xjc 的匹配版本：

<dependency>
    <groupId>org.eclipse.persistence</groupId>
  <artifactId>org.eclipse.persistence.moxy</artifactId>
    <version>3.0.1</version>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-xjc</artifactId>
    <version>3.0.1</version>
</dependency>

如果存在，请删除文件 jaxb.properties，因为在动态 jaxb 上下文的情况下不需要它。