Howto generate Java Enum from XML Schema with JAXB?

Question

I am using the maven plugin maven-jaxb2-plugin to generate POJOs from a XSD Schema file. This works fine. The only thing, thats really bothering me is, that the xml schema enumerations are not mapped in a Java Enum Type.

My maven plugin is generating the java pojos from a file I called schemachooser.xsd

schemachooser.xsd:

<?xml version="1.0" encoding="UTF-8"?> <schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:sch="http://www.ascc.net/xml/schematron"  targetNamespace="http://schema.something" elementFormDefault="qualified" version="1.0" xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc" jaxb:extensionBindingPrefixes="xjc" jaxb:version="1.0">  <xs:annotation>     <xs:appinfo>         <jaxb:globalBindings generateIsSetMethod="true" fixedAttributeAsConstantProperty="true">             <xjc:serializable />         </jaxb:globalBindings>         <jaxb:schemaBindings>            <jaxb:bindings node="//xsd:element[@name='ElementName']/xsd:simpleType">                <jaxb:typesafeEnumClass name="MyEnumType" />            </jaxb:bindings>         </jaxb:schemaBindings>     </xs:appinfo> </xs:annotation>  <xs:include schemaLocation="myNormalSchema.xsd" />  </schema> 

It does generate the files, but not the "new" Enum Class "MyEnumType". Am I using the bindings wrong?

Answer 1

If you want to keep the JAXB annotations separate from the XML schema then you need to use an JAXB bindings file:

bindings.xml

<jaxb:bindings      xmlns:xs="http://www.w3.org/2001/XMLSchema"     xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"     xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"     jaxb:extensionBindingPrefixes="xjc"     version="2.1">     <jaxb:globalBindings generateIsSetMethod="true" fixedAttributeAsConstantProperty="true">         <xjc:serializable />     </jaxb:globalBindings>     <jaxb:bindings schemaLocation="myNormalSchema.xsd">         <jaxb:bindings node="//xs:element[@name='ElementName']/xs:simpleType">                <jaxb:typesafeEnumClass name="MyEnumType" />         </jaxb:bindings>    </jaxb:bindings> </jaxb:bindings> 

myNormalSchema.xsd

Below is a sample XML schema that a reverse engineered from your question:

<?xml version="1.0" encoding="UTF-8"?> <xs:schema      targetNamespace="http://www.example.com"       xmlns="http://www.example.com"       xmlns:xs="http://www.w3.org/2001/XMLSchema">      <xs:element name="ElementName">         <xs:simpleType>             <xs:restriction base="xs:string">                 <xs:enumeration value="MY_ENUM_1"/>                 <xs:enumeration value="MY_ENUM_2"/>             </xs:restriction>         </xs:simpleType>    </xs:element>      <xs:element name="Root">         <xs:complexType>             <xs:sequence>                 <xs:element ref="ElementName"/>             </xs:sequence>         </xs:complexType>     </xs:element>  </xs:schema> 

XJC Call

xjc -extension -d out -b bindings.xml myNormalSchema.xsd 

MyEnumType

One of the generated classes is an enum called MyEnumType.

package com.example;  import javax.xml.bind.annotation.XmlEnum; import javax.xml.bind.annotation.XmlType;  @XmlType(name = "") @XmlEnum public enum MyEnumType {      MY_ENUM_1,     MY_ENUM_2;      public String value() {         return name();     }      public static MyEnumType fromValue(String v) {         return valueOf(v);     }  } 

Root

Also the Root class is generated with the isSet method:

package com.example;  import java.io.Serializable; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; import javax.xml.bind.annotation.XmlType;   @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "", propOrder = {     "elementName" }) @XmlRootElement(name = "Root") public class Root     implements Serializable {      @XmlElement(name = "ElementName", required = true)     protected MyEnumType elementName;      public MyEnumType getElementName() {         return elementName;     }      public void setElementName(MyEnumType value) {         this.elementName = value;     }      public boolean isSetElementName() {         return (this.elementName!= null);     }  } 

Examples

• http://bdoughan.blogspot.com/2011/05/schema-to-java-xmlmimetype.html
• http://bdoughan.blogspot.com/2011/04/xml-schema-to-java-xsd-choice.html