Question

我有一个模块化项目，在每个模块中，我使用jaxb2-maven-plugin用xjc编译XSD文件。现在，假设模块按照A - > B的顺序编译。对于A一切正常（即我得到* XsdImpl.java），但对于B我得到以下内容：

[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:jaxb2-maven-plugin:1.2:xjc (model) on project B: DTD factory class org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl does not extend from DTDDVFactory. -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:jaxb2-maven-plugin:1.2:xjc (model) on project B: DTD factory class org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl does not extend from DTDDVFactory
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        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.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.apache.maven.plugin.MojoExecutionException: DTD factory class org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl does not extend from DTDDVFactory.
        at org.codehaus.mojo.jaxb2.XjcMojo.execute(XjcMojo.java:352)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
Caused by: org.apache.xerces.impl.dv.DVFactoryException: DTD factory class org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl does not extend from DTDDVFactory.
        at org.apache.xerces.impl.dv.DTDDVFactory.getInstance(Unknown Source)
        at org.apache.xerces.impl.dv.DTDDVFactory.getInstance(Unknown Source)
        at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.<init>(Unknown Source)
        at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.<init>(Unknown Source)
        at org.apache.xerces.impl.xs.traversers.XSDHandler.<init>(Unknown Source)
        at org.apache.xerces.impl.xs.traversers.XSDHandler.<init>(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.<init>(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaLoader.<init>(Unknown Source)
        at org.apache.xerces.impl.xs.XMLSchemaValidator.<init>(Unknown Source)
        at org.apache.xerces.jaxp.validation.XMLSchemaValidatorComponentManager.<init>(Unknown Source)
        at org.apache.xerces.jaxp.validation.ValidatorHandlerImpl.<init>(Unknown Source)
        at org.apache.xerces.jaxp.validation.AbstractXMLSchema.newValidatorHandler(Unknown Source)
        at com.sun.tools.xjc.SchemaCache.newValidator(SchemaCache.java:47)
        at com.sun.tools.xjc.reader.xmlschema.bindinfo.AnnotationParserFactoryImpl$1$1.startElement(AnnotationParserFactoryImpl.java:136)
        at com.sun.xml.xsom.impl.parser.state.NGCCRuntime.startElement(NGCCRuntime.java:214)
        at org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:527)
        at com.sun.tools.xjc.reader.ExtensionBindingChecker.startElement(ExtensionBindingChecker.java:271)
        at org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:527)
        at com.sun.tools.xjc.reader.xmlschema.parser.IncorrectNamespaceURIChecker.startElement(IncorrectNamespaceURIChecker.java:97)
        at org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:527)
        at com.sun.tools.xjc.reader.xmlschema.parser.CustomizationContextChecker.startElement(CustomizationContextChecker.java:172)
        at org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:527)
        at com.sun.tools.xjc.ModelLoader$SpeculationChecker.startElement(ModelLoader.java:427)
        at org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:527)
        at com.sun.tools.xjc.reader.internalizer.VersionChecker.startElement(VersionChecker.java:78)
        at org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:527)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
        at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
        at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:333)
        at com.sun.xml.xsom.parser.JAXPParser.parse(JAXPParser.java:79)
        at com.sun.tools.xjc.ModelLoader$2.parse(ModelLoader.java:451)
        at com.sun.tools.xjc.ModelLoader$XMLSchemaParser.parse(ModelLoader.java:237)
        at com.sun.xml.xsom.impl.parser.NGCCRuntimeEx.parseEntity(NGCCRuntimeEx.java:298)
        at com.sun.xml.xsom.impl.parser.ParserContext.parse(ParserContext.java:87)
        at com.sun.xml.xsom.parser.XSOMParser.parse(XSOMParser.java:147)
        at com.sun.tools.xjc.ModelLoader.createXSOMSpeculative(ModelLoader.java:468)
        at com.sun.tools.xjc.ModelLoader.loadXMLSchema(ModelLoader.java:338)
        at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:145)
        at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:91)
        at com.sun.tools.xjc.Driver.run(Driver.java:287)
        at org.codehaus.mojo.jaxb2.XjcMojo.execute(XjcMojo.java:301)
        ... 21 more
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

这两个模块对插件使用相同的配置：

<plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>jaxb2-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <id>model</id>
                        <goals>
                            <goal>xjc</goal>
                        </goals>

                        <configuration>
                            <extension>true</extension>
                            <clearOutputDir>false</clearOutputDir>
                            <bindingDirectory>${basedir}/src/main/resources/xsd</bindingDirectory>

                            <outputDirectory>${basedir}/src/main/generated</outputDirectory>
                            <schemaDirectory>${basedir}/src/main/generated/xsd</schemaDirectory>

                            <schemaFiles>base.xsd</schemaFiles>
                            <staleFile>${project.build.directory}/generated-sources/jaxb/.staleFlag-model</staleFile>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

第二个模块始终出现错误（A或B无关紧要）。我花了很多时间试图找出幕后发生的事情，但不幸的是没有成功...... 例如，我想了解第一次执行时会发生什么：

    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
   --->>> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:333)

我猜想使用另一个类而不是org.apache.xerces.jaxp.SAXParserImpl，但是第二次选择了org.apache.xerces.jaxp.SAXParserImpl。你知道我怎么能证明这一点？或者是否有人遇到过同样的问题？

非常感谢任何提示/帮助！再见

Answer 1

问题是您在没有JAXP API的情况下无意中提供了JAXP实现，这与JRE捆绑在一起的JAXP API不兼容。

为了解决这个问题，我在项目的所有jaxb2插件中添加了JAXP API +实现依赖项：

            </executions>
            <dependencies>
                <dependency>
                    <groupId>xml-apis</groupId>
                    <artifactId>xml-apis</artifactId>
                    <version>1.3.04</version>
                </dependency>
                <dependency>
                    <groupId>xerces</groupId>
                    <artifactId>xercesImpl</artifactId>
                    <version>2.9.1</version>
                </dependency>
            </dependencies>
        </plugin>

请记住更新所有jaxb2插件，而不仅仅是失败的插件。这是因为插件依赖关系仅在第一次执行插件时才解析一次。这可能是也可能不是发生故障的模块。

==编辑==

请记住，自Java 1.6以来，所有必需的JAXP，JAXB，xerces，xalan，JAX-WS RI，SAAJ和相关类都在中捆绑在JRE库中。

您不需要在项目中包含任何这些deps，除非您使用古老的JDK（1.5或更早版本）构建。

因此，如果从POM中删除JAXB依赖项（并且可能升级到最新的jaxb2-maven-plugin），那么您的构建可能会正常工作。

Answer 2

我有类似的问题，并通过将Maven编译器的版本号从1.9更改为3.1为我工作。在我的POM中，我在插件下的2个位置进行了此更改...

<artifactId>maven-compiler-plugin</artifactId>
  <version>3.1</version>

Answer 3

在我的应用程序中包含一个旧的jar时遇到了类似的问题。在我的pom文件中，我使用了排除项来解决问题。

            <exclusions>
                <exclusion>
                    <groupId>xerces</groupId>
                    <artifactId>xercesImpl</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>xml-apis</groupId>
                    <artifactId>xml-apis</artifactId>
                </exclusion>
            </exclusions>

jaxb2 maven插件在第二次执行时不起作用

3 个答案: