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| − | = XmlElementWrapper and empty and null Collections =
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| − | In EclipseLink 2.4, MOXy's handling of empty and null Collections annotated with '''XmlElementWrapper''' has changed, to mirror the functionality of the JAXB reference implementation.
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| − | * Empty Collections annotated with '''XmlElementWrapper''' will now be marshalled as an empty wrapper element.
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| − | * Null Collections annotated with '''XmlElementWrapper(nillable = true)''' will now be marshalled as an wrapper element with '''xsi:nil="true"'''.
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| − | The examples below will use the following domain class:
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| − | <div style="width:800px">
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| − | <source lang="java">
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| − | @XmlRootElement
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| − | @XmlAccessorType(AccessType.FIELD)
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| − | public class PurchaseOrder {
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| − | String id;
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| − | String customerName;
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| − | @XmlElementWrapper(name = "line-items", nillable = true)
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| − | List<LineItem> item = null;
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| − | }
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| − | </source>
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| − | </div>
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| − | == Null Collections ==
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| − | <div style="width:800px">
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| − | <source lang="java">
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| − | PurchaseOrder po = new PurchaseOrder();
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| − | po.customerName = "Sarah Connor";
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| − | po.id = "FDKJHG387SKUH29887";
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| − | marshaller.marshal(po, System.out);
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| − | </source>
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| − | </div>
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| − | The null collection will be marshalled as an empty wrapper element with '''xsi:nil="true"''':
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| − | <div style="width:800px">
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| − | <source lang="xml">
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| − | <?xml version="1.0" encoding="UTF-8"?>
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| − | <purchaseOrder>
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| − | <id>FDKJHG387SKUH29887</id>
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| − | <customerName>Rick Barkhosue</customerName>
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| − | <line-items xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>
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| − | </purchaseOrder>
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| − | </source>
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| − | </div>
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| − | In versions of EclipseLink prior to 2.4, the '''line-items''' element would be absent.
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| − | == Empty Collections ==
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| − | <div style="width:800px">
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| − | <source lang="java">
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| − | PurchaseOrder po = new PurchaseOrder();
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| − | po.customerName = "Sarah Connor";
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| − | po.id = "FDKJHG387SKUH29887";
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| − | po.item = new ArrayList<LineItem>();
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| − | marshaller.marshal(po, System.out);
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| − | </source>
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| − | </div>
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| − | The empty collection will be marshalled as an empty wrapper element:
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| − | <div style="width:800px">
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| − | <source lang="xml">
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| − | <?xml version="1.0" encoding="UTF-8"?>
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| − | <purchaseOrder>
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| − | <id>FDKJHG387SKUH29887</id>
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| − | <customerName>Rick Barkhosue</customerName>
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| − | <line-items/>
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| − | </purchaseOrder>
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| − | </source>
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| − | </div>
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| − | In versions of EclipseLink prior to 2.4, the '''line-items''' element would be absent.
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| − | == Configuration ==
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| − | If you would like to keep the old EclipseLink behaviour, you can use an '''XmlNullPolicy''' annotation:
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| − | Using Annotations:
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| − | <div style="width:800px">
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| − | <source lang="java">
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| − | @XmlElementWrapper(name="line-items", nillable=true)
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| − | @XmlNullPolicy(shouldMarshalEmptyCollections=false)
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| − | List<LineItem> item = null;
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| − | </source>
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| − | </div>
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| − | Using EclipseLink XML Bindings:
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| − | <div style="width:800px">
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| − | <source lang="xml">
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| − | <xml-element java-attribute="item"/>
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| − | <xml-element-wrapper name="line-items" nillable="true" />
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| − | <xml-null-policy should-marshal-empty-collections="false" />
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| − | </xml-element>
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| − | </source>
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| − | </div>
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| − | By specifying '''(shouldMarshalEmptyCollections = false)''', neither null nor empty Collections will appear in marshalled XML.
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