[aloubyansky]

The exception is expected in this case since pattern's condition property is bound as

@XmlElementWrapper(name = "condition")
 @XmlElements( {
 @XmlElement(name = "and", type = AndMetaData.class),
 @XmlElement(name = "contains", type = ContainsMetaData.class),
 @XmlElement(name = "equal", type = EqualMetaData.class),
 @XmlElement(name = "exists", type = ExistsMetaData.class),
 @XmlElement(name = "not", type = NotMetaData.class),
 @XmlElement(name = "or", type = OrMetaData.class),
 @XmlElement(name = "subdomain-of", type = SubdomainOfMetaData.class)})
 public void setCondition(ConditionMetaData condition) {
 this.condition = condition;
 }

Remove wrapping condition element.

Unfortunately, XmlElementRef is not supported currently.

[deruelle_jean]

Removal of the wrapping condition element did it.

Thanks a lot ! You've been a life saver ;-)