This post explains how to generate Java files from XSD using JAXB and Maven. I have created a simple Maven web application project and placed the XSD files under src\main\xsd folder of the root of the Maven project.

The pom.xml is as given below.

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.thea</groupId>
    <artifactId>jaxbgenerator</artifactId>
    <packaging>war</packaging>
    <version>0.1</version>
    <name>jaxbgenerator Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
         <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.1.3</version>
        </dependency>
    </dependencies>
    <repositories>
        <repository>
            <id>central</id>
            <name>Repository for Maven </name>
            <url>http://repo1.maven.org/maven2/</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>codehausplugin</id>
            <name>Repository for plugin </name>
            <url>http://repository.codehaus.org/</url>
        </pluginRepository>
    </pluginRepositories>
    <build>
        <finalName>jaxbgenerator</finalName>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>jaxb2-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>xjc</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <packageName>com.thea.assessment</packageName>
                    <schemaFiles>college/StudentDetails.xsd</schemaFiles>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.5</source>
                    <target>1.5</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

The command to generate Java files is    mvn jaxb2:xjc

If you notice the StudentDetails.xsd is under a folder college [that is from the project root it is under src\main\xsd\college]. Any other referred xsd files also can be placed under src\main\xsd.

By default the Java files are placed in the folder target\generated-sources\jaxb under project root. To override this you can specify outputDirectory value in the above pom.xml

 <configuration>
 <packageName>com.thea.assessment</packageName>
 <outputDirectory>${basedir}/src/main/java</outputDirectory>
 <schemaFiles>college/StudentDetails.xsd</schemaFiles>
 </configuration>

As observed the generated Java files will have the package name com.thea.assessment.

If we do not specify any value for schemaFiles, all xsd files under src/main/xsd will be processed.

To know how to unmarshal (map) a xml file into the Java files generated using above steps please refer Unmarshal XML into Java using JAXB