[midPoint] Create inbound mapping for a multi-value attribute

[Prabhakara Rao Doddapaneni]

My resource is giving a field value as  set<String>.  I defined a multi-value string attribute in my extension template to be used during synchronization.
Extension template content:            <xsd:element name="linkedItems" type="xsd:string" minOccurs="0" maxOccurs="unbounded">                <xsd:annotation>                    <xsd:appinfo>                        <a:indexed>true</a:indexed>                        <a:displayName>Linked Item Ids</a:displayName>                        <a:displayOrder>130</a:displayOrder>                    </xsd:appinfo>                </xsd:annotation>            </xsd:element>

Resource schema definition:                  <xsd:element maxOccurs="unbounded"                               minOccurs="0"                               name="linkedItems"                               type="xsd:string">                     <xsd:annotation>                        <xsd:appinfo>                           <a:displayOrder>800</a:displayOrder>                           <ra:frameworkAttributeName>linkedItems</ra:frameworkAttributeName>                        </xsd:appinfo>                     </xsd:annotation>                  </xsd:element>
schemaHandling:         <attribute>            <c:ref>ri:linkedItems</c:ref>            <tolerant>true</tolerant>            <exclusiveStrong>false</exclusiveStrong>            <inbound>               <authoritative>true</authoritative>               <exclusive>false</exclusive>               <strength>normal</strength>               <target>                  <c:path>$user/extension/linkedItems</c:path>               </target>               <condition>                  <script>                     <code> !basic.isEmpty(input)</code>                  </script>               </condition>            </inbound>         </attribute>
When i try to import accounts from this resource, it is failing with an exception java.lang.IllegalArgumentException(Attribute 'linkedItems' type 'class java.util.Collections$EmptySet' is not supported.

Can somebody help me how to map the inbound collection to a multi-value attribute?
Thanks,Prabhakar.
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