protected Object createInstance() 
{
		if (this.sourceSet == null) {
			throw new IllegalArgumentException("'sourceSet' is required");
		}
		Set result = null;
		if (this.targetSetClass != null) {
			result = (Set) BeanUtils.instantiateClass(this.targetSetClass);
		}
		else {
			result = new LinkedHashSet(this.sourceSet.size());
		}
		Class valueType = null;
		if (this.targetSetClass != null && JdkVersion.isAtLeastJava15()) {
			valueType = GenericCollectionTypeResolver.getCollectionType(this.targetSetClass);
		}
		if (valueType != null) {
			TypeConverter converter = getBeanTypeConverter();
			for (Iterator it = this.sourceSet.iterator(); it.hasNext();) {
				result.add(converter.convertIfNecessary(it.next(), valueType));
			}
		}
		else {
			result.addAll(this.sourceSet);
		}
		return result;
}

 public Class getObjectType() 
{
		return Set.class;
}

 public  void setSourceSet(Set sourceSet) 
{
		this.sourceSet = sourceSet;
}

Set the source Set, typically populated via XML "set" elements.

 public  void setTargetSetClass(Class targetSetClass) 
{
		if (targetSetClass == null) {
			throw new IllegalArgumentException("'targetSetClass' must not be null");
		}
		if (!Set.class.isAssignableFrom(targetSetClass)) {
			throw new IllegalArgumentException("'targetSetClass' must implement [java.util.Set]");
		}
		this.targetSetClass = targetSetClass;
}

Set the class to use for the target Set. Can be populated with a fully qualified class name when defined in a Spring application context.

Default is a linked HashSet, keeping the registration order.