This tutorial will show you how to generate Jaxb classes from Xsd file using Gradle. Generating jaxb classes from xsd using Gradle is not an easy task because Gradle does not have yet any ready-made plugin like Maven. So to generate java classes from xsd schema using Gradle we have to write an an Ant Task. The below example will show you how to do it.

JDK 8 or 9
Have Gradle installed and configured
Required dependencies in Gradle’s build file
Now follow the below steps in order to complete the example.
Create Gradle project GradleXsdToJaxb in Eclipse
Put below shiporder.xsd file under src/main/resources/xsd

<xs:schema xmlns:xs=""
	xmlns:tns="http://localhost/hello/hello-service" targetNamespace="http://localhost/hello/hello-service"
	<xs:element name='comment' type='xs:string' />
	<xs:element name='purchaseOrder' type='tns:PurchaseOrderType' />
	<xs:complexType name='USAddress'>
				Purchase order schema
			<xs:element name='name' type='xs:string' />
			<xs:element name='street' type='xs:string' />
			<xs:element name='city' type='xs:string' />
			<xs:element name='state' type='xs:string' />
			<xs:element name='zip' type='xs:decimal' />
		<xs:attribute name='country' type='xs:NMTOKEN' fixed='US' />
	<xs:simpleType name='SKU'>
		<xs:restriction base='xs:string'>
			<xs:pattern value='\d{3}\w{3}' />
	<xs:complexType name='Items'>
			<xs:element name='item' minOccurs='0' maxOccurs='unbounded'>
						<xs:element name='productName' type='xs:string' />
						<xs:element name='quantity'>
								<xs:restriction base='xs:positiveInteger'>
									<xs:minInclusive value='1' />
									<xs:maxExclusive value='100' />
						<xs:element name='USPrice' type='xs:decimal' />
						<xs:element ref='tns:comment' />
						<xs:element name='shipDate' type='xs:date' minOccurs='0' />
					<xs:attribute name='partNum' type='tns:SKU' />
	<xs:complexType name='PurchaseOrderType'>
			<xs:element name='shipTo' type='tns:USAddress' />
			<xs:element name='billTo' type='tns:USAddress' />
			<xs:element ref='tns:comment' minOccurs='0' />
			<xs:element name='items' type='tns:Items' />
		<xs:attribute name='orderDate' type='xs:date' />
		<xs:attribute name='confirmDate' type='xs:date' use='required' />

Sample xsd could be found here
build.gradle file

Gradle does not have a JAXB plugin (yet), it involves an ant task, which makes it a bit more complex than in maven.

buildscript {
    repositories {
    dependencies {
apply plugin: 'java'
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
} "src/generated-sources/java"
configurations {
dependencies {
    jaxb (
task jaxb {
    System.setProperty('javax.xml.accessExternalSchema', 'all')
    def jaxbTargetDir = file("src/generated-sources/java")
    doLast {
			name: 'xjc',
			classname: '',
			classpath: configurations.jaxb.asPath
        ant.jaxbTargetDir = jaxbTargetDir
			destdir: '${jaxbTargetDir}',
			package: 'com.roytuts.jaxb',
			schema: 'src/main/resources/xsd/shiporder.xsd'
compileJava.dependsOn jaxb

Once you build the project you will find required Java classes have been generated under directory src/generated-sources/java.

If you face issue like “java.lang.NoClassDefFoundError: javax/activation/DataSource” in JDK 9 then add below line to file and build


Now while refreshing project in Eclipse, if you face problem creating virtual machine then you can remove the above line from after build and refresh the project in Eclipse.

Thanks for reading.


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