How to make generated classes contain Javadoc from XML Schema documentation

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I'm currently working with an XML Schema that has <xsd:annotation>/<xsd:documentation> on most types and elements. When I generate Java Beans from this XML Schema, then the Javadoc of those Beans only contains some generic generated information about the allowed content of the type/element.

I'd like to see the content of the <xsd:documentation> tag in the relevant places (for example the content of that tag for a complextType should show up in the Javadoc of the class generated to represent that complexType).

Is there any way to achieve this?

Edit: this XML Schema will be used in a WSDL with JAX-WS, so this tag might be appropriate as well.

Edit 2: I've read about <jxb:javadoc>. From what I understand I can specify that either in a separate JAXB binding file or directly in the XML Schema. That would almost solve my problem. But I'd rather use the existing <xsd:documentation> tag, since Javadoc is not the primary target of the documentation (it's information about the data structure primarily and not about the Java Beans generated from it) and to allow non-JAXB tools to access the information as well. Providing the documentation in both <jxb:javadoc> and xsd:documentation> "feels" wrong, because I'm duplicating data (and work) for no good reason.

Edit 3: Thanks to the answer by Pascal I realized that I already have half a solution: The <xsd:documentation> of complexTypes is written to the beginning of its Javadoc! The problem is still that only that complexTypes is used and simpleTypes (which can also result in a class) and elements are still Javadoc-less.

xjc jaxb javadoc jax-ws java
4 Answers

Especially for that case I wrote XJC plugin xjc-documentation-annotation-plugin.

What it does: <annotation><documentation> -> Java class annotations

Said we have this object described in XSD:

<xs:complexType name="CadastralBlock">
    <xs:annotation>
        <xs:documentation>Cadastral quarter</xs:documentation>
    </xs:annotation>
    <xs:sequence>
        <xs:element name="number" type="xs:string">
            <xs:annotation>
                <xs:documentation>Cadastral number</xs:documentation>
            </xs:annotation>
        </xs:element>
</xs:complexType>

We run xjc like:

xjc -npa -no-header -d src/main/generated-java/ -p xsd.generated scheme.xsd

And got class like (getters, setters and any annotations omitted for simplicity):

public class CadastralBlock {
    protected String number;
}

But in my case I want known how to class and fields was named in source file! So it what this plugin do!

So you get:

@XsdInfo(name = "Cadastral quarter", xsdElementPart = "<complexType name=\"CadastralBlock\">\n  <complexContent>\n    <restriction base=\"{http://www.w3.org/2001/XMLSchema}anyType\">\n      <sequence>\n        <element name=\"number\" type=\"{http://www.w3.org/2001/XMLSchema}string\"/></sequence>\n      </restriction>\n  </complexContent></complexType>")
public class CadastralBlock {
    @XsdInfo(name = "Cadastral number")
    protected String number;
}

How to use

Manual call in commandline

If you want run it manually ensure jar class with plugin in run classpath and just add option -XPluginDescriptionAnnotation. F.e.:

xjc -npa -no-header -d src/main/generated-java/ -p xsd.generated -XPluginDescriptionAnnotation scheme.xsd

Call from Java/Groovy

Driver.run(
    [
        '-XPluginDescriptionAnnotation'
        ,'-d', generatedClassesDir.absolutePath
        ,'-p', 'info.hubbitus.generated.test'
        ,'CadastralBlock.xsd'
    ] as String[]
    ,new XJCListener() {...}
)

See test XJCPluginDescriptionAnnotationTest for example.

Use from Gradle

With gradle-xjc-plugin:

plugins {
    id 'java'
    id 'org.unbroken-dome.xjc' version '1.4.1' // https://github.com/unbroken-dome/gradle-xjc-plugin
}

...

dependencies {
    xjcClasspath 'info.hubbitus:xjc-documentation-annotation-plugin:1.0'
}

// Results by default in `build/xjc/generated-sources`
xjcGenerate {
    source = fileTree('src/main/resources') { include '*.xsd' }
    packageLevelAnnotations = false
    targetPackage = 'info.hubbitus.xjc.plugin.example'
    extraArgs = [ '-XPluginDescriptionAnnotation' ]
}

Complete gradle example in example-project-gradle directory of project.

user_3075250
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