{"id":9483,"date":"2013-03-07T13:00:29","date_gmt":"2013-03-07T11:00:29","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=9483"},"modified":"2013-03-07T05:02:16","modified_gmt":"2013-03-07T03:02:16","slug":"jaxb-and-java-util-map","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2013\/03\/jaxb-and-java-util-map.html","title":{"rendered":"JAXB and java.util.Map"},"content":{"rendered":"

Is it ironic that it can be difficult to map the java.util.Map <\/i>class in JAXB (JSR-222)<\/a>? In this post I will cover some items that will make it much easier.<\/p>\n

Java Model<\/h2>\n

Below is the Java model that we will use for this example.<\/p>\n

Customer<\/h4>\n

The Customer<\/i> class has a property of type Map <\/i>. I chose this Map<\/i> specifically since the key is a domain object and the value is a domain object.<\/p>\n

package blog.map;\r\n\r\nimport java.util.*;\r\nimport javax.xml.bind.annotation.*;\r\n\r\n@XmlRootElement\r\npublic class Customer {\r\n\r\n    private Map<String, Address> addressMap = new HashMap<String, Address>();\r\n\r\n    public Map<String, Address> getAddressMap() {\r\n        return addressMap;\r\n    }\r\n\r\n    public void setAddressMap(Map<String, Address> addressMap) {\r\n        this.addressMap = addressMap;\r\n    }\r\n\r\n}<\/pre>\n
Address<\/h4>\n
The Address class is just a typical POJO.<\/p>\n
package blog.map;\r\n\r\npublic class Address {\r\n\r\n    private String street;\r\n\r\n    public String getStreet() {\r\n        return street;\r\n    }\r\n\r\n    public void setStreet(String street) {\r\n        this.street = street;\r\n    }\r\n\r\n}<\/pre>\n
Demo Code <\/h2>\n
In the demo code below we will create an instance of Customer<\/i> and populate its Map<\/i> property. Then we will marshal it to XML.<\/p>\n
package blog.map;\r\n\r\nimport javax.xml.bind.*;\r\n\r\npublic class Demo {\r\n\r\n    public static void main(String[] args) throws Exception {\r\n        JAXBContext jc = JAXBContext.newInstance(Customer.class);\r\n\r\n        Address billingAddress = new Address();\r\n        billingAddress.setStreet('1 A Street');\r\n\r\n        Address shippingAddress = new Address();\r\n        shippingAddress.setStreet('2 B Road');\r\n\r\n        Customer customer = new Customer();\r\n        customer.getAddressMap().put('billing', billingAddress);\r\n        customer.getAddressMap().put('shipping', shippingAddress);\r\n\r\n        Marshaller marshaller = jc.createMarshaller();\r\n        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);\r\n        marshaller.marshal(customer, System.out);\r\n    }\r\n\r\n}<\/pre>\n
Use Case #1 – Default Representation<\/h2>\n
Below is a sample of XML corresponding to our domain model. We see that each item in the Map\u00a0 <\/i>has key\u00a0 <\/i>and value<\/i> elements wrapped in an entry<\/i> element.<\/p>\n
<?xml version='1.0' encoding='UTF-8'?>\r\n<customer>\r\n    <addressMap>\r\n        <entry>\r\n            <key>shipping<\/key>\r\n            <value>\r\n                <street>2 B Road<\/street>\r\n            <\/value>\r\n        <\/entry>\r\n        <entry>\r\n            <key>billing<\/key>\r\n            <value>\r\n                <street>1 A Street<\/street>\r\n            <\/value>\r\n        <\/entry>\r\n    <\/addressMap>\r\n<\/customer><\/pre>\n
Use Case #2 – Rename the Element <\/h2>\n
The JAXB reference implementation uses the @XmlElementWrapper<\/i> annotation to rename the element corresponding to a Map<\/i> property (we’ve added this support to MOXy in EclipseLink 2.4.2 and 2.5.0). In previous versions of MOXy the @XmlElement <\/i>annotation should be used.
 
<\/div> <\/div><\/p>\n
Customer <\/h4>\n
We will use the @XmlElementWrapper<\/i> annotation to rename the element corresponding to the addressMap<\/i> property to be addresses<\/i>.<\/p>\n
package blog.map;\r\n\r\nimport java.util.*;\r\nimport javax.xml.bind.annotation.*;\r\n\r\n@XmlRootElement\r\npublic class Customer {\r\n\r\n    private Map<String, Address> addressMap = new HashMap<String, Address>();\r\n\r\n    @XmlElementWrapper(name='addresses')\r\n    public Map<String, Address> getAddressMap() {\r\n        return addressMap;\r\n    }\r\n\r\n    public void setAddressMap(Map<String, Address> addressMap) {\r\n        this.addressMap = addressMap;\r\n    }\r\n\r\n}<\/pre>\n
Output<\/h4>\n
Now we see that the addressMap<\/i> element has been renamed to addresses<\/i>.<\/p>\n
<?xml version='1.0' encoding='UTF-8'?>\r\n<customer>\r\n    <addresses>\r\n        <entry>\r\n            <key>shipping<\/key>\r\n            <value>\r\n                <street>2 B Road<\/street>\r\n            <\/value>\r\n        <\/entry>\r\n        <entry>\r\n            <key>billing<\/key>\r\n            <value>\r\n                <street>1 A Street<\/street>\r\n            <\/value>\r\n        <\/entry>\r\n    <\/addresses>\r\n<\/customer><\/pre>\n
Use Case #3 – Add Namespace Qualification<\/h2>\n
In this use case we will examine the impact of applying namespace qualification to a class that has a property of type java.util.Map<\/i> . There was a MOXy bug related to the namespace qualification of Map properties that has been fixed in EclipseLink 2.4.2 and 2.5.0 (see: http:\/\/bugs.eclipse.org\/399297<\/a>).<\/p>\n
package-info<\/h4>\n
We will use the package level @XmlSchema <\/i>annotation to specify that all fields\/properties belonging to classes in this package should be qualified with the  http:\/\/www.example.com<\/i> namespace (see: JAXB & Namespaces<\/a>).<\/p>\n
@XmlSchema(\r\n    namespace='http:\/\/www.example.com',\r\n    elementFormDefault=XmlNsForm.QUALIFIED)\r\npackage blog.map;\r\n\r\nimport javax.xml.bind.annotation.*;<\/pre>\n
Output <\/h4>\n
We see that the elements corresponding to the Customer<\/i> and Address <\/i>classes are namespace qualified, but the elements corresponding to the Map<\/i> class are not. This is because the Map<\/i> class is from the java.util <\/i>package and therefore the information we specified on the package level @XmlSchema<\/i> annotation does not apply.<\/p>\n
<?xml version='1.0' encoding='UTF-8'?>\r\n<ns2:customer xmlns:ns2='http:\/\/www.example.com'>\r\n    <ns2:addresses>\r\n        <entry>\r\n            <key>shipping<\/key>\r\n            <value>\r\n                <ns2:street>2 B Road<\/ns2:street>\r\n            <\/value>\r\n        <\/entry>\r\n        <entry>\r\n            <key>billing<\/key>\r\n            <value>\r\n                <ns2:street>1 A Street<\/ns2:street>\r\n            <\/value>\r\n        <\/entry>\r\n    <\/ns2:addresses>\r\n<\/ns2:customer><\/pre>\n
Use Case #4 – Fix Namespace Qualification with an XmlAdapter <\/h2>\n
We can use an XmlAdapter<\/i> to adjust the namespace qualification from the previous use case.<\/p>\n
XmlAdapter (MapAdapter)<\/h4>\n
The XmlAdapter<\/i> mechanism allows you to convert a class to another for the purpose of affecting the mapping (see: XmlAdapter – JAXB’s Secret Weapon<\/a>). To get the appropriate namespace qualification we will use an XmlAdapter<\/i> to convert the Map<\/i> to objects in the package for our domain model.<\/p>\n
package blog.map;\r\n\r\nimport java.util.*;\r\nimport javax.xml.bind.annotation.adapters.XmlAdapter;\r\n\r\npublic class MapAdapter extends XmlAdapter<MapAdapter.AdaptedMap, Map<String, Address>> {\r\n\r\n    public static class AdaptedMap {\r\n\r\n        public List<Entry> entry = new ArrayList<Entry>();\r\n\r\n    }\r\n\r\n    public static class Entry {\r\n\r\n        public String key;\r\n\r\n        public Address value;\r\n\r\n    }\r\n\r\n    @Override\r\n    public Map<String, Address> unmarshal(AdaptedMap adaptedMap) throws Exception {\r\n        Map<String, Address> map = new HashMap<String, Address>();\r\n        for(Entry entry : adaptedMap.entry) {\r\n            map.put(entry.key, entry.value);\r\n        }\r\n        return map;\r\n    }\r\n\r\n    @Override\r\n    public AdaptedMap marshal(Map<String, Address> map) throws Exception {\r\n        AdaptedMap adaptedMap = new AdaptedMap();\r\n        for(Map.Entry<String, Address> mapEntry : map.entrySet()) {\r\n            Entry entry = new Entry();\r\n            entry.key = mapEntry.getKey();\r\n            entry.value = mapEntry.getValue();\r\n            adaptedMap.entry.add(entry);\r\n        }\r\n        return adaptedMap;\r\n    }\r\n\r\n}<\/pre>\n
Customer<\/h4>\n
The @XmlJavaTypeAdapter<\/i> annotation is used to specify the XmlAdapter<\/i> on the Map<\/i> property. Note with an XmlAdaper<\/i> applied we need to change the @XmlElementWrapper<\/i> annotation to @XmlElement <\/i>(evidence that @XmlElement<\/i> should be used to annotate the element for a Map<\/i> property).<\/p>\n
package blog.map;\r\n\r\nimport java.util.*;\r\nimport javax.xml.bind.annotation.*;\r\nimport javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;\r\n\r\n@XmlRootElement\r\npublic class Customer {\r\n\r\n    private Map<String, Address> addressMap = new HashMap<String, Address>();\r\n\r\n    @XmlJavaTypeAdapter(MapAdapter.class)\r\n    @XmlElement(name='addresses')\r\n    public Map<String, Address> getAddressMap() {\r\n        return addressMap;\r\n    }\r\n\r\n    public void setAddressMap(Map<String, Address> addressMap) {\r\n        this.addressMap = addressMap;\r\n    }\r\n\r\n}<\/pre>\n
Output <\/h4>\n
Now all the elements in the XML output are qualfied with the http:\/\/www.example.com <\/i>namespace.<\/p>\n
<?xml version='1.0' encoding='UTF-8'?>\r\n<customer xmlns='http:\/\/www.example.com'>\r\n    <addresses>\r\n        <entry>\r\n            <key>shipping<\/key>\r\n            <value>\r\n                <street>2 B Road<\/street>\r\n            <\/value>\r\n        <\/entry>\r\n        <entry>\r\n            <key>billing<\/key>\r\n            <value>\r\n                <street>1 A Street<\/street>\r\n            <\/value>\r\n        <\/entry>\r\n    <\/addresses>\r\n<\/customer><\/pre>\n
 <\/p>\n
Reference: <\/i><\/b>JAXB and java.util.Map<\/a> from our JCG partner<\/a> Blaise Doughan at the Java XML & JSON Binding<\/a> blog.<\/p>\n","protected":false},"excerpt":{"rendered":"
Is it ironic that it can be difficult to map the java.util.Map class in JAXB (JSR-222)? In this post I will cover some items that will make it much easier. Java Model Below is the Java model that we will use for this example. Customer The Customer class has a property of type Map . …<\/p>\n","protected":false},"author":51,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[144,107],"class_list":["post-9483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-jaxb","tag-xml"],"yoast_head":"\nJAXB and java.util.Map<\/title>\n<meta name=\"description\" content=\"Is it ironic that it can be difficult to map the java.util.Map class in JAXB (JSR-222)? 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