Maven Jaxb2 xjc plugin error No schemas have been found

Question

These days I've spent some time on JAXB for converting XSD to Java Class and vice versa. Here's a very good tutorial for beginners, http://www.journaldev.com/1312/how-to-generate-java-classes-from-xsd-using-xjc-maven-plugin. I follow the steps strictly, but always get error when mvn clean install

Here's my pom.xml file.

<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>

But when I type mvn clean install, it always give me error as following:

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

Can anyone show me the cause or simply tell me what should I refer to for further information?

Another question is : according to this question Difference of Maven JAXB plugins, there's at least three jaxb plugins. So all of these plugins are all generated for the same purposes? If so ,why?

Thanks in advance!

Answer 1

As you did not provide any schemaDirectory, the plugin is trying to generate Java sources from all XML schema files in the default schema directory. You should configure the plugin according to the documentation :

<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

Try to make sure that jaxb.xsd is present under src/main/resources, the plugin is waring since it coudn't find the scheme in the specified location.

Answer 3

We can use as below in pom.xml file

   <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>src/main/java</outputDirectory>
                    <clearOutputDir>false</clearOutputDir>
                    <packageName>com.subu.xsd.model</packageName>
                    <schemaDirectory>src/main/java/schemadir</schemaDirectory>
                    <schemaFiles>XYZ.xsd</schemaFiles>
                </configuration>
            </execution>
        </executions>
    </plugin>

Answer 4

The OP already got their answer, but I ran into this same problem for a different reason...

I introduced a new class that JAXB wasn't generating source for. This is because I used a parameterized constructor. Once I added a no-arg constructor the problem was fixed.