JAXB 对根元素感到困惑？

发布于 2024-12-21 05:56:23 字数 1199 浏览 2 评论 0原文

我正在尝试使用 Visio XML 架构封送文件，由3个模式文件组成，使用XJC生成java源时会生成三个包：

com.microsoft.schemas.visio._2003.core
com.microsoft.schemas.visio._2006.extension
com.microsoft.schemas.office.visio._2010.extension

根元素是 VisioDocument，我使用的所有类都在 <代码>2003包。

以下是我编组 XML 文件的方法：

VisioDocumentType visioDoc = new VisioDocumentType();
... manipulated here ...
JAXBContext jc = JAXBContext.newInstance("com.microsoft.schemas.visio._2003.core");
Marshaller m = jc.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
m.marshal(new JAXBElement<VisioDocumentType>(new QName("uri","local"), VisioDocumentType.class, visioDoc), bw);

执行时，我收到此错误：

javax.xml.bind.MarshalException
 - with linked exception:
[com.sun.istack.internal.SAXException2: unable to marshal type "com.microsoft.schemas.visio._2003.core.PagePropsType" as an element because it is missing an @XmlRootElement annotation]

我正在使用 PagePropsType，但它不是根元素。 JAXB 为什么这么认为？

原文

I'm trying to marshal a file using the Visio XML Schema, which consists of 3 schema files and produces three packages when java source is generated with XJC:

com.microsoft.schemas.visio._2003.core
com.microsoft.schemas.visio._2006.extension
com.microsoft.schemas.office.visio._2010.extension

The root element is VisioDocument, and all of the classes I'm using are in the 2003 package.

Here is my approach to marshalling my XML file:

VisioDocumentType visioDoc = new VisioDocumentType();
... manipulated here ...
JAXBContext jc = JAXBContext.newInstance("com.microsoft.schemas.visio._2003.core");
Marshaller m = jc.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
m.marshal(new JAXBElement<VisioDocumentType>(new QName("uri","local"), VisioDocumentType.class, visioDoc), bw);

When executed, I receive this error:

javax.xml.bind.MarshalException
 - with linked exception:
[com.sun.istack.internal.SAXException2: unable to marshal type "com.microsoft.schemas.visio._2003.core.PagePropsType" as an element because it is missing an @XmlRootElement annotation]

I am using PagePropsType, but it is not a root element. Why does JAXB think it is?

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梦言归人 2024-12-28 05:56:23

问题出在代码的 ... 这里操作 ... 部分。

基于您执行以下操作（或类似操作）的假设。

// you create a page prop
PagePropsType pageProps = ...

// then you feed it to a shape sheet
ShapeSheetType shapeSheet = ...
shapeSheet.getTextOrXFormOrLine().add(pageProps);

_{（ShapeSheetType 是 StyleSheetType 等的超类。）}

如果是这种情况，那么您的问题在于添加 pageProps< /code> 直接添加到列表。

如果您查看 getTextOrXFormOrLine() 方法的文档，它会列出列表可以保存的类型。每种类型都包装在 JAXBElement<...> 中，因此您必须在将其添加到列表之前包装 pageProps 。

你应该这样做：

ObjectFactory objectFactory = new ObjectFactory();
JAXBElement<PagePropsType> pagePropsElement = objectFactory.createShapeSheetTypePageProps(pageProps);

_{（请注意，我使用 XJC 2.2.4 来编译模式；对我来说，每个类的名称都以 Type 为后缀。也许这就是我结束的原因像您一样使用 VisioDocumentType 而不是 VisioDocument，但这应该不重要。）}

The problem resides in the ... manipulated here ... part of your code.

Based on the assumption that you do the following (or something similar).

// you create a page prop
PagePropsType pageProps = ...

// then you feed it to a shape sheet
ShapeSheetType shapeSheet = ...
shapeSheet.getTextOrXFormOrLine().add(pageProps);

_{(ShapeSheetType is a superclass for StyleSheetType, et cetera.)}

If this's the case, then your problem lies in adding the pageProps to the list directly.

If you take a look at the getTextOrXFormOrLine() method's documentation it lists what kind of types the list can hold. Every type is wrapped in a JAXBElement<...> so you have to wrap pageProps before adding it to the list.

You should do it like this:

ObjectFactory objectFactory = new ObjectFactory();
JAXBElement<PagePropsType> pagePropsElement = objectFactory.createShapeSheetTypePageProps(pageProps);

_{(Note that I've used XJC 2.2.4 to compile the schemas; for me every class' name is suffixed with Type. Maybe this is why I ended up with VisioDocumentType instead of VisioDocument like you, but it shouldn't matter.)}

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