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I want to work with Eclipse and jdk 22 with JAXB to compile an xsd schema in order to generate the java classes.

I don't have a Maven installation except the one built into Eclipse itself.

To do this I create a maven project in Eclipse and configure pom.xml as follows:

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.prueba</groupId> <artifactId>ruebaJAXB</artifactId> <version>0.0.1-SNAPSHOT</version> <dependencies> <dependency> <groupId>jakarta.xml.bind</groupId> <artifactId>jakarta.xml.bind-api</artifactId> <version>4.0.2</version> </dependency> <dependency> <groupId>org.glassfish.jaxb</groupId> <artifactId>jaxb-runtime</artifactId> <version>2.3.3</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>jaxb2-maven-plugin</artifactId> <version>2.4.0</version> <executions> <execution> <goals> <goal>xjc</goal> </goals> </execution> </executions> <configuration> <schemaFiles> <schemaFile>${basedir}/src/main/resources/personas.xsd</schemaFile> </schemaFiles> <outputDirectory>${project.build.directory}/src/capaNegocio</outputDirectory> </configuration> </plugin> </plugins> </build> </project>

I have a schema in src/main/resources. If I right-click on it under the Generate option, I only see the XML File option.

What steps do I need to take to generate Java classes from this schema?

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  • Which version of JAXB API are you targeting ? Jakarta-based 4.x or Javax-based 2.3 ? You're importing API 4.x but Runtime 2.3 which are incompatible... In order to launch generation from Eclipse, you could right-click on the project itself and then "run as" menu -> "maven generate sources" Commented Nov 14, 2024 at 8:33

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After you right-click on the project and let it Maven -> Update Project..., right-click on it again, choosing Run As... -> Maven Build... and make sure xjc is in the Goals text field.

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If you are using a recent Eclipse version, this should integrate the auto building process for maven projects with the jaxb2-maven-plugin without too much effort from the user (at least, a confirm that it has to install an addition for maven lifecycle mapping to manage that maven plugin).

You don't have usually to use the Generate > JAXB Classes... menu because the integration of the plugin in the building pipeline should already have generated all the xsd described classes automatically.

As an alternative to the jaxb2-maven-plugin, you can also consider using the cxf-xjc-plugin by Apache, like this:

<properties> <org.apache.cxf.xjc.version>4.0.2</org.apache.cxf.xjc.version> </properties> <dependencies> <dependency> <groupId>org.apache.cxf.xjc-utils</groupId> <artifactId>cxf-xjc-runtime</artifactId> <version>${org.apache.cxf.xjc.version}</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.cxf</groupId> <artifactId>cxf-xjc-plugin</artifactId> <version>${org.apache.cxf.xjc.version}</version> <executions> <execution> <id>xjc</id> <goals> <goal>xsdtojava</goal> </goals> <phase>generate-sources</phase> <configuration> <fork>always</fork> <encoding>UTF-8</encoding> <additionalJvmArgs>-Duser.language=en</additionalJvmArgs> <xsdOptions> <xsdOption> <xsd>${basedir}/src/main/resources/personas.xsd</xsd> <packagename>com.mypackage</packagename> </xsdOption> </xsdOptions> </configuration> </execution> </executions> </plugin>

In this case, the generated sources are put under the target/generated/src/main/java/com/mypackage directory.

Also in this case, the integration in Eclipse is quite seamlessy and the plugin appears in the Lifecycle Mapping of the project; the sources are generated automatically during the project building phase.

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