How to populate collection like map with annotation in mybatis?

  <collection property="participantCas" column="agmtsID" javaType="java.util.ArrayList" ofType="com.Client">
    <id property="partyId" column="partcptPartyId"/>
    <result property="clientName" column="partcptName"/>
    <result property="cas" column="partcptcas"/></collection>

I have tried to map this collection property using annotation. But it didn't work.How to remap this collection property? Please let us know the answer ASAP.Thank you very much in advance.