我正在努力解决这个问题，任何信息将不胜感激。我有一个项目，它已经使用 JAXB 一段时间来从 XML 架构构建 Java 模型并使用该模型。现在它已经在 Java 8 中运行了一些。
但是，我已经升级到 Open JDK 10，当我尝试将 XML 文件解组到 Java 对象中时，出现此错误...
java.lang.IllegalArgumentException: javax.xml.bind.UnmarshalException: unexpected element (uri:"http://www.minestar.cat.com/namespace/units",
local:"units"). Expected elements are <{}units>
at minestar.units.schema.parser.UnitsXmlParser.readXml(UnitsXmlParser.java:31)
at minestar.units.javagenerator.JavaGeneratorPlugin.execute(JavaGeneratorPlugin.java:41)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:290)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:194)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: javax.xml.bind.UnmarshalException: unexpected element (uri:"http://www.minestar.cat.com/namespace/units", local:"units"). Expected
elements are <{}units>
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:741)
at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:262)
at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:257)
at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:124)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1149)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:574)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:556)
at com.sun.xml.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:168)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:374)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScanner
Impl.java:613)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScan
nerImpl.java:3058)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:821)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:5
32)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:888)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:824)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:635)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:258)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:229)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:170)
at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:209)
at minestar.units.schema.parser.UnitsXmlParser.readXml(UnitsXmlParser.java:29)
... 23 more
我正在使用 maven-jaxb2-plugin 生成源，它们看起来不错。我已升级到该插件的最新版本（在撰写本文时，0.14.0）。类生成得很好，并且生成了一个 package-info.java 类并将其编译到生成的 jar 中。有问题的类在顶部看起来像这样
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
"dimensions",
"quantityTypes"
})
@XmlRootElement(name = "units")
public class Units {
@XmlElement(name = "dimension")
protected List<Dimension> dimensions;
@XmlElement(name = "quantityType")
protected List<QuantityType> quantityTypes;
package-info.java 看起来像这样
@javax.xml.bind.annotation.XmlSchema(namespace = "http://www.minestar.cat.com/namespace/units", elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package minestar.units.schema;
因为这是 Java 10，所以我已将直接依赖项添加到 javax.xml.bind:jaxb-api:2.3.0、com.sun.xml.bind:jaxb-core:2.3.0 和 com.sun.xml.bind :jaxb-impl:2.3.0。
我尝试将 JAXB 实现从 RI 更改为 Eclipse MOXy，但这没有什么区别。
作为测试，我编辑了上面生成的 Units.java 类文件，将命名空间属性添加到 @XmlRootElement 注释中...
@XmlRootElement(namespace = "http://www.minestar.cat.com/namespace/units", name = "units")
public class Units {
当这个java文件被编译并在下游使用时，XML文件就可以被解析。我没有收到 UnmarshalException。然而，这个源文件是生成的，所以我不能依赖这些更改保持不变。此外，从我从比我自己更有见识的人那里读到的所有内容来看，package-info.class 文件（位于 JAR 文件中）应该使注释中的名称空间值变得不必要。
如果有什么地方我没有正确设置，我将不胜感激您在 Java 10 中使其正常工作的任何帮助。
谢谢你的帮助，
埃德
