Question

我在Maven环境中使用xjc插件并尝试从Schema生成类我能够从命令行使用xjc执行此操作（创建类），但无法使用maven target generate-sources执行相同操作。
获得以下异常

[ERROR] null[5,30]
org.xml.sax.SAXParseException: A class/interface with the same name "<className>" is already in use. Use a class customization
to resolve this conflict.
        at com.sun.tools.xjc.util.CodeModelClassFactory.createClass(CodeModelClassFactory.java:100)
        at com.sun.tools.xjc.util.CodeModelClassFactory.createClass(CodeModelClassFactory.java:61)
        at com.sun.tools.xjc.generator.bean.ImplStructureStrategy$1.createClasses(ImplStructureStrategy.java:42)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.generateClassDef(BeanGenerator.java:371)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.getClazz(BeanGenerator.java:403)
        at com.sun.tools.xjc.generator.bean.BeanGenerator$1.onBean(BeanGenerator.java:291)
        at com.sun.tools.xjc.generator.bean.BeanGenerator$1.onBean(BeanGenerator.java:299)
        at com.sun.tools.xjc.model.CClassInfo.accept(CClassInfo.java:352)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.getContainer(BeanGenerator.java:281)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.getUsedPackages(BeanGenerator.java:337)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.<init>(BeanGenerator.java:169)
        at com.sun.tools.xjc.generator.bean.BeanGenerator.generate(BeanGenerator.java:151)
        at com.sun.tools.xjc.model.Model.generateCode(Model.java:230)
        at com.sun.tools.xjc.Driver.run(Driver.java:317)
        at org.codehaus.mojo.jaxb2.XjcMojo.execute(XjcMojo.java:301)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

任何人都可以帮我找到这里遗漏的东西。

Answer 1

如JAXB网站上所述，使用以下Maven插件：

        <plugin>
.           <groupId>org.jvnet.jaxb2.maven2</groupId>
            <artifactId>maven-jaxb2-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

http://java.net/projects/maven-jaxb2-plugin/pages/Home

http://jaxb.java.net/

看来，你正在使用一个不同的插件（org.codehaus.mojo.jaxb2.XjcMojo在你的堆栈跟踪上，谷歌引导我http://mojo.codehaus.org/jaxb2-maven-plugin/）。

Answer 2

由于它在命令行中工作但在Maven中没有，因此具有冲突的类必须出现在类路径的某个位置。发生的任何机会？

有关如何解决名称冲突的示例，请参阅：

How do I create JAXB bindings for docbook

Answer 3

可能你有两个同名的子元素，所以生成的类名是一样的吗？

如果是这种情况，您可以使用架构注释自定义生成的类名：

首先将以下命名空间添加到xsd：

<xs:schema xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" jaxb:version="2.0">

第二个添加相关元素的注释：

<xs:complexType name="ComplexType">
    <xs:annotation><xs:appinfo>
       <jaxb:class name="MyClass"> 
           <jaxb:javadoc>This is my class.</jaxb:javadoc>
       </jaxb:class>
    </xs:appinfo></xs:annotation>
</xs:complexType>

无法在Maven环境中从JAXB生成类

3 个答案: