无法让 EclipseLink MOXy 工作

Question

我是 JAXB 的新手，我想使用 EclipseLink MOXy 更改默认命名空间前缀。 我的 package-info.java 有以下代码行：

@javax.xml.bind.annotation.XmlSchema (
namespace="http://namespace.mysite.com/",
xmlns = { 
    @javax.xml.bind.annotation.XmlNs(prefix="myns", 
               namespaceURI="http://namespace.mysite.com/")
},
elementFormDefault = javax.xml.bind.annotation.XmlNsForm.UNQUALIFIED
)
package com.core.mymodel;

我的 jaxb.properties 文件具有以下行：

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

I have added eclipselink.jar to the CLASSPATH, both package-info.java and jaxb.properties files are in the same package as my model classes, however, when I run the program I get the following error message:

javax.xml.bind.JAXBException: Provider org.eclipse.persistence.jaxb.JAXBContextFactory        not found
- with linked exception:
[java.lang.ClassNotFoundException: org.eclipse.persistence.jaxb.JAXBContextFactory]
at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
at javax.xml.bind.ContextFinder.find(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)

我已经用 EclipseLink 版本 2.3.0 和 2.0.2 进行了尝试，但仍然收到相同的错误消息。 有谁碰巧知道可能是什么问题？

提前谢谢了

Answer 1

根据异常消息，您的jaxb.properties文件似乎是正确的：

javax.xml.bind.JAXBException: Provider org.eclipse.persistence.jaxb.JAXBContextFactory        not found
- with linked exception:
[java.lang.ClassNotFoundException: org.eclipse.persistence.jaxb.JAXBContextFactory]
at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
at javax.xml.bind.ContextFinder.find(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)

要确认org.eclipse.persistence.jaxb.JAXBContextFactory在您的类路径上，您可以尝试：

JAXBContext jc = JAXBContextFactory.createContext("com.core.mymodel", null);

要进行更基本的确认，您可以运行：

System.out.println(org.eclipse.persistence.Version.getVersion());

了解更多信息

• http://bdoughan.blogspot.com/2011/05/specifying-eclipselink-moxy-as-your.html

Answer 2

将其用作系统属性

System.setProperty("javax.xml.bind.JAXBContextFactory", "org.eclipse.persistence.jaxb.JAXBContextFactory");

Answer 3

只需显式指定 JAXBContext：

JAXBContext jaxbContext = org.eclipse.persistence.jaxb.JAXBContextFactory
                .createContext(new Class[] {YourClass.class}, null);