java - Read data from table where primary key is composite using hibernate -

i have these pojo classes in project.

 public class merchantchainuser extends com.avanza.ni.common.dto.abstractdto     implements java.io.serializable {  private long chainid; private compositepk compositepk;   public merchantchainuser() {  }  public void setchainid(long chainid) {     this.chainid = chainid; } public long getchainid() {     return chainid; }  public void setcompositepk(compositepk compositepk) {     this.compositepk = compositepk; }  public compositepk getcompositepk() {     return compositepk; } }  ,      public class compositepk implements serializable {  private long merchantid; private long userid;  public void setmerchantid(long merchantid) {     this.merchantid = merchantid; }  public long getmerchantid() {     return merchantid; }  public void setuserid(long userid) {     this.userid = userid; }  public long getuserid() {     return userid; }  } 

hbm.xml file merchantuserchain is

 <hibernate-mapping> <class name="com.avanza.ni.portal.dto.merchantchainuser" table="merchant_chain_user">     <composite-id name="compositepk">         <key-property name="merchantid" type="long" column="merchant_id"></key-property>         <key-property name="userid" type="long" column="merchant_user_id"></key-property>     </composite-id>     <property name="chainid" type="long">         <column name="merchant_chain_id" length="38" />     </property> </class> 

now wanted have read data table using merchant_user_id. able retreive whole data table want set criteria only give me row merchant_user_id specific. didn't know how write data criteria.

the answer put comment has been deleted, post here :d

criteria crit = session.createcriteria(merchantchainuser.class) .add(restrictions.eq("compositepk.userid", userid)); 

or hql

session.createquery("from merchantchainuser compositepk.userid = :userid").setparameter("userid",userid);