Maven Jaxb2 xjc插件错误未找到任何模式

Question

这些天我花了一些时间在JAXB上将XSD转换为Java Class,反之亦然.这是一个非常好的初学者教程,http://www.journaldev.com/1312/how-to-generate-java-classes-from-xsd-using-xjc-maven-plugin.我严格遵循这些步骤,但总是会出错mvn clean install

这是我的pom.xml档案.

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>jd</groupId>
    <artifactId>jd</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>


    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>


    <build>
        <plugins>
            <!-- Plugin required to build java classes from XSD using XJC -->
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>jaxb2-maven-plugin</artifactId>
                <version>1.5</version>
                <executions>
                    <execution>
                        <id>xjc</id>
                        <goals>
                            <goal>xjc</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                   <!-- The name of your generated source package -->
                    <arguments>-extension -npa -b ${project.basedir}/src/main/java/com/moodys/jaxb/global.xjb</arguments>
                </configuration>
            </plugin>

        </plugins>
    </build>

</project>

但是当我输入时mvn clean install,它总是给我错误如下:

C:\Users\congy\Desktop\Work\workspace\JaxbFromClass>mvn clean jaxb2:xjc
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building jd 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ jd ---
[INFO] Deleting C:\Users\congy\Desktop\Work\workspace\JaxbFromClass\target
[INFO]
[INFO] --- jaxb2-maven-plugin:1.5:xjc (default-cli) @ jd ---
[INFO] Generating source...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.487s
[INFO] Finished at: Thu Jul 04 19:09:37 CST 2013
[INFO] Final Memory: 4M/122M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:jaxb2-maven-plugin:1.5:xjc (default-cli) on project jd: No schemas have been found -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[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

任何人都可以告诉我原因或只是告诉我我应该参考什么进一步的信息？

另一个问题是:根据这个问题Maven JAXB插件的区别,至少有三个jaxb插件.所有这些插件都是为了相同的目的而生成的？如果是这样,为什么？

提前致谢!

Answer 1

由于您没有提供任何内容schemaDirectory,插件会尝试从默认架构目录中的所有XML架构文件生成Java源代码.您应该根据文档配置插件:

<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>jaxb2-maven-plugin</artifactId>
  <version>1.5</version>
  <executions>
    <execution>
      <id>id1</id>
      <goals>
    <goal>xjc</goal>
      </goals>
      <configuration>
       <outputDirectory>target/generated-sources/jaxb</outputDirectory>
       <packageName>com.your.package.jaxb</packageName>
       <schemaDirectory>src/main/xsd</schemaDirectory>
       <schemaFiles>jaxb.xsd</schemaFiles>
      </configuration>
    </execution>
  </executions>
</plugin>

Answer 2

尝试确保jaxb.xsd存在于src/main/resources 下，插件正在警告，因为它无法在指定位置找到方案。