Usage of Composite primary key in hibernate

Usage of Composite primary key in hibernate

AbcEntity.java
============================================
package com.xyz.entity;
import java.io.Serializable;

public class AbcEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    private AbcEntityInputPK id;

    private String answer;

    public AbcEntity() {
    }

    public AbcEntityInputPK getId() {
        return this.id;
    }

    public void setId(AbcEntityInputPK id) {
        this.id = id;
    }
   
    public String getAnswer() {
        return this.answer;
    }

    public void setAnswer(String answer) {
        this.answer = answer;
    }

}
AbcEntityInputPK.java - composite primary class
===============================================
package com.xyz.entity;
import java.io.Serializable;

public class AbcEntityInputPK implements Serializable {
    private static final long serialVersionUID = 1L;
    private Integer qId;

    private Short cId;

    public AbcEntityInputPK() {
    }
    public Integer getQId() {
        return this.qId;
    }
    public void setQId(Integer qId) {
        this.qId = qId;
    }
    public Short getCId() {
        return this.cId;
    }
    public void setCId(Short cId) {
        this.cId = cId;
    }

    public boolean equals(Object other) {
        if (this == other) {
            return true;
        }
        if (!(other instanceof AbcEntityInputPK)) {
            return false;
        }
        AbcEntityInputPK cOther = (AbcEntityInputPK)other;
        return
            (this.qId == cOther.qId)
            && (this.cId == cOther.cId);

    }
   
    public int hashCode() {
        final int prime =7;
        int hash = 17;
        hash = hash * prime + ((int) (this.qId ^ (this.qId >>> 32)));
        hash = hash * prime + ((int) (this.cId ^ (this.cId >>> 32)));
       
        return hash;
    }
}


hbm file
========================================
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.xyz.entity.AbcEntity" table="ABC_TABLE_INPUT">
        <composite-id name="id" class="com.xyz.entity.AbcEntityInputPK">
            <key-property name="qId" type="int">
                <column name="Q_ID" precision="10" scale="0" />
            </key-property>
            <key-property name="cId" type="short">
                <column name="C_ID" precision="10" scale="0" />
            </key-property>
        </composite-id>
        <property name="answer" type="string">
            <column name="ANSWER" length="500" />
        </property>
    </class>
</hibernate-mapping>