XSD to Java, specify to use a Java HashMap
java, jaxb, wadl, xml, xsd
Solution
Yes, maps are handled seamlessly by jaxb, but only in one way.
The solution is described here:
http://todayguesswhat.blogspot.co.uk/2012/09/jaxb-xsd-to-java-maphashmap-example.html
But it is a lot of hassle if you already have a class that maps correctly. Why do you want to regenerate it from XSD?
Problem
I am trying to generate some Java class from XSD schema. I know exactly what I want to generate in Java, and I'm trying to write the corresponding XSD schema. I need to represent a java.util.HashMap (HashMap). I can't find how to specify in the XSD schema (or xjb binding file) that I want an HasMap in Java. It always generate a List.. here the code I want to generate ``` @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "ErrorMessage", propOrder = { "name", "details"}) public class ErrorMessage { @XmlElement(required = true) protected String name; @XmlElement(required = false) protected java.util.Map<String, String> details = new HashMap<String, String>(); ``` I have tried this: ``` <xsd:complexType name="ErrorMessage"> <xsd:sequence> <xsd:element name="name" type="xsd:string" /> <xsd:element name="details" type="map" /> </xsd:sequence> </xsd:complexType> <xsd:complexType name="map"> <xsd:sequence> <xsd:element name="mapEntry" type="mapEntry" minOccurs="0" maxOccurs="unbounded" /> </xsd:sequence> </xsd:complexType> <xsd:complexType name="mapEntry"> <xsd:sequence> <xsd:element name="key" type="xsd:string" /> <xsd:element name="value" type="xsd:string" /> </xsd:sequence> </xsd:complexType> ``` But it still continue to generate a java.util.List of mapEntry: In my "Error" class: protected Map details = new Map(); Instead of ``` protected java.util.Map<String, String> details = new HashMap<String, String>(); ``` And the generated "map" class is : ``` @XmlAccessorType(XmlAccessType.FIELD) @XmlType(name = "map", propOrder = {"mapEntry"}) public class Map { protected List<MapEntry> mapEntry; ``` I really need to use a map for my application. Any idea about how I can do ? Note: I have also tried to use Oracle owi:hasmp but got a namespace error. ``` xmlns:owi="http://www.oracle.com/webservices/internal" (also tried with xmlns:owi="http://www.oracle.com/webservices/internal/literal") ``` included in my schema declaration and my "details" element declared as below ``` <xsd:element name="details" type="owi:hashmap" /> ``` The error is: src-resolve.4.2: Error resolving component 'owi:hasmap'. It was detected that 'owi:hasmap' is in namespace 'http://www.oracle.com/webservices/internal', but components from this namespace are not referenceable from schema document 'file://myFile.xsd. If this is the incorrect namespace, perhaps the prefix of 'owi:hasmap' needs to be changed. If this is the correct namespace, then an appropriate 'import' tag should be added to 'file://myFile.xsd And it can not associate "owi:hasmap" to any type definition component. Any idea ?