jaxb2 maven插件在第二次執行時不起作用

Question

我有一個模塊化項目，其中對於每個單個模塊，我都使用jaxb2-maven-plugin用xjc編譯XSD文件。 現在，假設模塊以A-> B的順序編譯。 對於A，一切正常（即，我得到* XsdImpl.java），但對於BI，則得到以下內容：

[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

這兩個模塊對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>

該錯誤總是出現在第二個模塊上（無論是A還是B）。 我花了很多時間試圖弄清楚幕后發生了什么，但是不幸的是沒有成功……例如，我想了解在這里第一次執行時發生了什么：

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

我猜想使用的是另一個類而不是org.apache.xerces.jaxp.SAXParserImpl，但是以某種方式第二次選擇了org.apache.xerces.jaxp.SAXParserImpl。您知道如何證明這一點嗎？ 還是有人遇到過同樣的問題？

在此先感謝您的任何提示/幫助！ 再見

Answer 1

問題是您無意中提供了沒有JAXP API的JAXP實現，該實現與JRE捆綁的JAXP API不兼容。

為了解決此問題，我向項目中的所有jaxb2插件添加了JAXP API +實現依賴項：

            </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>

記住要更新所有的jaxb2插件，而不僅僅是失敗的插件。 這是因為第一次執行插件時，插件依賴項僅解析一次。 這可能是發生故障的模塊，也可能不是。

==編輯==

請記住，從Java 1.6開始，所有必需的JAXP，JAXB，xerces，xalan，JAX-WS RI，SAAJ和相關類都捆綁在JRE庫中 。

除非您使用過時的JDK（1.5或更早版本）進行構建，否則您無需在項目中包括任何這些部門。

因此，如果您從POM中刪除JAXB依賴項（並可能升級到最新的jaxb2-maven-plugin），則您的構建可能會正常工作。

Answer 2

我遇到了類似的問題，並將下面的Maven編譯器的版本號從1.9更改為3.1可以為我工作。 在我的POM中，我在插件下的2個地方進行了此更改...

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

Answer 3

在我的應用程序中包含一個舊的jar時遇到了類似的問題。 在我的pom文件中，我使用了排除項來解決問題。

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