@XmlElement(defaultValue="...")

[starksm64]

I'm not seeing an element get populated with a default value if the property has this specified, for example:

 @XmlElement(defaultValue="org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock")
 public void setLockingPolicy(String lockingPolicy)
 {
 if (lockingPolicy == null)
 throw new IllegalArgumentException("Null lockingPolicy");
 this.lockingPolicy = lockingPolicy;
 }

Accessing the lockPolicy value after parsing a document without a locking-policy element does not produce the indicated default value. Shouldn't this?

[aloubyansky]

But the element must still be present in the XML.

"jaxb20 spec" wrote:
Element defaulting
The default value is derived from the element declaration?s {value
constraint} property?s value. Unlike attribute defaulting, an element only
defaults when there is an empty element tag in an xml document. The
element?s default value is captured by mapping annotation
@XmlElement.defaultValue(). The unmarshaller sets the
property to this default value when it encounters an empty element tag.

[jason.greene]

The following link explains this further, it basically mirrors XML schema default behavior:
https://jaxb.dev.java.net/guide/Element_default_valus_and_unmarshalling.html

[starksm64]

Ok, so I assme that the xjc tool would not generate a class with the field initialized to this default value then as it would distinguish between a non-existent value and a default?

[jason.greene]

Exactly. xjc uses the defaultValue attribute instead.