由于两个声明导致 ObjectFactory 类发生冲突，maven-jaxb2-plugin 无法生成类答案

【问题标题】：maven-jaxb2-plugin cannot generate classes due to two declarations cause a collision in ObjectFactory class由于两个声明导致 ObjectFactory 类发生冲突，maven-jaxb2-plugin 无法生成类
【发布时间】：2020-06-15 09:35:18
【问题描述】：

我在/src/main/resources/wsdl 中创建了.wsdl 文件。这里我已经粘贴了soap wsdl的内容。

我在 maven 中添加了以下插件：


<plugins>
    <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
    <plugin>
        <groupId>org.jvnet.jaxb2.maven2</groupId>
        <artifactId>maven-jaxb2-plugin</artifactId>
        <version>0.14.0</version>

        <executions>
            <execution>
                <goals>
                    <goal>generate</goal>
                </goals>

                <configuration>
                    <generatePackage>bankup.wsdl</generatePackage>
                    <generateDirectory>${project.basedir}/src/main/java</generateDirectory>
                    <schemaDirectory>${project.basedir}/src/main/resources/wsdl</schemaDirectory>
                    <schemaIncludes>
                        <include>*.wsdl</include>
                    </schemaIncludes>
                    <clearOutputDir>true</clearOutputDir>
                </configuration>

            </execution>

        </executions>
    </plugin>

由于从 wsdl 生成类时出错，项目构建失败。 objectFactory 类中有两个声明集合。错误如下：

[ERROR] Error while generating code.Location [ http://uri/ifx?xsd=ws-bankup_schema4.xsd{3125,63}].
com.sun.istack.SAXParseException2: Two declarations cause a collision in the ObjectFactory class.
    at com.sun.tools.xjc.ErrorReceiver.error (ErrorReceiver.java:86)
    at com.sun.tools.xjc.generator.bean.ObjectFactoryGeneratorImpl.populate (ObjectFactoryGeneratorImpl.java:191)
    at com.sun.tools.xjc.generator.bean.PublicObjectFactoryGenerator.populate (PublicObjectFactoryGenerator.java:59)
    at com.sun.tools.xjc.generator.bean.BeanGenerator.<init> (BeanGenerator.java:272)
    at com.sun.tools.xjc.generator.bean.BeanGenerator.generate (BeanGenerator.java:171)
    at com.sun.tools.xjc.model.Model.generateCode (Model.java:288)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.generateCode (XJC23Mojo.java:66)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute (XJC23Mojo.java:41)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute (XJC23Mojo.java:28)
    at org.jvnet.jaxb2.maven2.RawXJC2Mojo.doExecute (RawXJC2Mojo.java:478)
    at org.jvnet.jaxb2.maven2.RawXJC2Mojo.execute (RawXJC2Mojo.java:320)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    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:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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)
[ERROR] Error while generating code.Location [ http://uri/ifx?xsd=ws-bankup_schema5.xsd{3,63}].
com.sun.istack.SAXParseException2: (Related to above error) This is the other declaration.   
    at com.sun.tools.xjc.ErrorReceiver.error (ErrorReceiver.java:86)
    at com.sun.tools.xjc.generator.bean.ObjectFactoryGeneratorImpl.populate (ObjectFactoryGeneratorImpl.java:193)
    at com.sun.tools.xjc.generator.bean.PublicObjectFactoryGenerator.populate (PublicObjectFactoryGenerator.java:59)
    at com.sun.tools.xjc.generator.bean.BeanGenerator.<init> (BeanGenerator.java:272)
    at com.sun.tools.xjc.generator.bean.BeanGenerator.generate (BeanGenerator.java:171)
    at com.sun.tools.xjc.model.Model.generateCode (Model.java:288)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.generateCode (XJC23Mojo.java:66)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute (XJC23Mojo.java:41)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute (XJC23Mojo.java:28)
    at org.jvnet.jaxb2.maven2.RawXJC2Mojo.doExecute (RawXJC2Mojo.java:478)
    at org.jvnet.jaxb2.maven2.RawXJC2Mojo.execute (RawXJC2Mojo.java:320)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    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:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE

通过阅读日志，我了解到 wsdl 有很多方案存在冲突。

我检查了计划并看到了 schema6 导入 schema4 和 schema4 导入 schema3 和 schema3 导入 schema2 和 schema2 导入 schema1。为了防止冲突，我更改了插件配置以在单独的包中创建模式对象。下面是我对插件所做的修改：

<plugin>
    <groupId>org.jvnet.jaxb2.maven2</groupId>
    <artifactId>maven-jaxb2-plugin</artifactId>
    <version>0.14.0</version>
    <executions>

        <execution>
            <id>schema6-genearate</id>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <schemaDirectory>src/main/resources/wsdl</schemaDirectory>
                <schemaIncludes>
                    <include>schema6.xsd</include>
                </schemaIncludes>
                <generatePackage>bankup.schema6.generated</generatePackage>
                <generateDirectory>${project.build.directory}/generated-sources/xjc1</generateDirectory>
            </configuration>
        </execution>

        <execution>
            <id>schema5-genearate</id>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <schemaDirectory>src/main/resources/wsdl</schemaDirectory>
                <schemaIncludes>
                    <include>schema5.xsd</include>
                </schemaIncludes>
                <generatePackage>bankup.schema5.generated</generatePackage>
                <generateDirectory>${project.build.directory}/generated-sources/xjc1</generateDirectory>
            </configuration>
        </execution>

    </executions>
</plugin>

即使它们是在不同的包中生成的，它仍然给我同样的错误。

[ERROR] Error while generating code.Location [ schema4.xsd{3125,63}].
com.sun.istack.SAXParseException2: Two declarations cause a collision in the ObjectFactory class.
    at com.sun.tools.xjc.ErrorReceiver.error (ErrorReceiver.java:86)
    at com.sun.tools.xjc.generator.bean.ObjectFactoryGeneratorImpl.populate (ObjectFactoryGeneratorImpl.java:191)
    at com.sun.tools.xjc.generator.bean.PublicObjectFactoryGenerator.populate (PublicObjectFactoryGenerator.java:59)
    at com.sun.tools.xjc.generator.bean.BeanGenerator.<init> (BeanGenerator.java:272)
    at com.sun.tools.xjc.generator.bean.BeanGenerator.generate (BeanGenerator.java:171)
    at com.sun.tools.xjc.model.Model.generateCode (Model.java:288)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.generateCode (XJC23Mojo.java:66)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute (XJC23Mojo.java:41)
    at org.jvnet.mjiip.v_2_3.XJC23Mojo.doExecute (XJC23Mojo.java:28)
    at org.jvnet.jaxb2.maven2.RawXJC2Mojo.doExecute (RawXJC2Mojo.java:478)
    at org.jvnet.jaxb2.maven2.RawXJC2Mojo.execute (RawXJC2Mojo.java:320)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    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:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    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)
[ERROR] Error while generating code.Location [schema5.xsd{3,63}].
com.sun.istack.SAXParseException2: (Related to above error) This is the other declaration.

为什么还会出现这种情况？？任何帮助，我将不胜感激，到明天我将投入 50+ 分以及帮助我解决此问题的人。

谢谢。

【问题讨论】：

从不生成代码 int src/main/java。默认情况下，代码将生成到target/generated-sources/xjc/<package>，通常不需要以这种方式配置插件。保持约定并将您的wsdl 定位到src/main/resources（请参阅文档github.com/highsource/maven-jaxb2-plugin/wiki/…）。保持约定优于配置。

标签： java maven soap wsdl

【解决方案1】：

要解决此问题，您需要创建bind.xjb 文件。在路径src/main/java/bindings 中创建bind.xjb 文件。在这个文件中，我们将解决阻止创建ObjectFactory 的冲突。令人高兴的是在您的架构中，您在schema6 和schema5 中声明了ObjectFactory。所以解决这个问题的方法是要在单独的包中生成的架构。在bind.xjb文件中，我们将指示maven插件生成来自schema5 和schema6 的类在不同的包中。下面是bind.xjb文件的代码：

<jaxb:bindings version="1.0"
    xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
    jaxb:extensionBindingPrefixes="xjc">

    <jaxb:bindings
        schemaLocation="schema6.xsd"
        node="/xs:schema">

        <jaxb:schemaBindings>
            <jaxb:package name="bankup.schema6" />
        </jaxb:schemaBindings>

    </jaxb:bindings>

    <jaxb:bindings
        schemaLocation="schema5.xsd"
        node="/xs:schema">

        <jaxb:schemaBindings>
            <jaxb:package name="bankup.schema5" />
        </jaxb:schemaBindings>

    </jaxb:bindings>

</jaxb:bindings>

之后你需要在maven jaxb2插件中配置bind.xjb。为此，您应该修改maven jaxb2 plugin 如下：

            <plugin>
                <groupId>org.jvnet.jaxb2.maven2</groupId>
                <artifactId>maven-jaxb2-plugin</artifactId>
                <version>0.14.0</version>
                <executions>

                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>

                        <configuration>
                            <bindingDirectory>${project.basedir}/src/main/resources/bindings</bindingDirectory>
                            <bindingIncludes>
                                <include>bind.xjb</include>
                            </bindingIncludes>
                            <schemaDirectory>${project.basedir}/src/main/resources/wsdl</schemaDirectory>
                            <schemaIncludes>
                                <include>*.wsdl</include>
                            </schemaIncludes>
                            <clearOutputDir>true</clearOutputDir>
                            <vmArgs>
                                <vmArg>-Djavax.xml.accessExternalSchema=all</vmArg>
                            </vmArgs>
                        </configuration>

                    </execution>


                </executions>

            </plugin>

运行构建后，所有类都应该在默认目录下生成：target/generated-sources/xjc。

希望对你有帮助。

【讨论】：