<class name="ru.xxx.BusinessAction" table="`BusinessAction`"
      batch-size="10" mutable="false">

      <cache usage="read-only"/>

      <id name="id" column="`BusinessActionId`" type="ru.xxx.hibernate.UniqueKeyType" access="field">
         <generator class="ru.incom.solaris.hibernate.UniqueKeyGenerator"/>
      </id>

      <property name="name" column="`BusinessActionName`" access="field"/>

   </class>

public class BusinessAction implements Serializable
{
   private UniqueKey id = null;

   private String name;

   private transient String cachedToString = null;

   public UniqueKey getId()
   {
      return id;
   }

   public String getName()
   {
      return name;
   }

   public boolean equals(Object o)
   {
      if (this == o) return true;
      if (!(o instanceof BusinessAction)) return false;

      final BusinessAction businessAction = (BusinessAction) o;

      if (name != null ? !name.equals(businessAction.name) : businessAction.name != null) return false;

      return true;
   }

   public int hashCode()
   {
      return (name != null ? name.hashCode() : 0);
   }

   public String toString()
   {
      if (null == this.cachedToString)
      {
         StringBuffer result = new StringBuffer("BusinessAction@{")
               .append("id: ").append(id)
               .append(", name: ").append(name)
               .append("}");

         this.cachedToString = result.toString();
      }

      return this.cachedToString;

   }
}

public class BusinessPermission implements Serializable, IModelObject
{
   public static final BusinessPermission EMPTY = new BusinessPermission();

   private UniqueKey id = null;

   private BusinessAction businessAction;

   private BusinessClass businessClass;

   /**
    * Lazily initialized, cached hashCode.
    * see item 8 of "Effective Jave".
    */
   private volatile int hashCode = 0;

   public BusinessPermission()
   {
   }

   public BusinessPermission(BusinessAction businessAction, BusinessClass businessClass)
   {
      if (null == businessAction)
         throw new NullPointerException("Argument businessAction is null!");

      if (null == businessAction.getId())
         throw new IllegalArgumentException("Argument businessAction.getId() is null!");

      if (null == businessClass)
         throw new NullPointerException("Argument businessClass is null!");

      if (null == businessClass.getId())
         throw new IllegalArgumentException("Argument businessClass.getId() is null!");

      this.businessAction = businessAction;
      this.businessClass = businessClass;
   }

   public UniqueKey getId()
   {
      return id;
   }

   public BusinessAction getBusinessAction()
   {
      return businessAction;
   }

   public BusinessClass getBusinessClass()
   {
      return businessClass;
   }

   public boolean equals(Object o)
   {
      if (this == o) return true;
      if (!(o instanceof BusinessPermission)) return false;

      final BusinessPermission businessPermission = (BusinessPermission) o;

      if (businessAction != null ? !businessAction.equals(businessPermission.businessAction) : businessPermission.businessAction != null) return false;
      if (businessClass != null ? !businessClass.equals(businessPermission.businessClass) : businessPermission.businessClass != null) return false;

      return true;
   }

   public int hashCode()
   {
      if (0 == hashCode)
      {
         int result = 17;
         result = 37 * result + (businessAction != null ? businessAction.hashCode() : 0);
         result = 37 * result + (businessClass != null ? businessClass.hashCode() : 0);
         hashCode = result;
      }

      return hashCode;
   }

   public String toString()
   {
      StringBuffer result = new StringBuffer("BusinessPermission@{")
         .append("id: ").append(id)
         .append(", businessAction: ").append(businessAction)
         .append(", businessClass: ").append(businessClass)
         .append("}");

      return result.toString();
   }
}

<hibernate-mapping>
   <class name="ru.xxx.common.security.BusinessPermission" table="`BusinessPermission`"
      batch-size="100" mutable="false">

      <cache usage="nonstrict-read-write"/>

      <id name="id" column="`BusinessPermissionId`" type="ru.xxx.hibernate.UniqueKeyType" access="field">
         <generator class="ru.xxx.hibernate.UniqueKeyGenerator"/>
      </id>

      <many-to-one name="businessAction" column="`BusinessActionId`" access="field" cascade="none"
         class="ru.xxx.common.security.BusinessAction" outer-join="false"/>

      <many-to-one name="businessClass" column="`BusinessClassId`" access="field" cascade="none"
         class="ru.xxx.common.security.BusinessClass" outer-join="false"/>

   </class>
</hibernate-mapping>

<ehcache>
   <diskStore path="java.io.tmpdir"/>

   <defaultCache
      maxElementsInMemory="10000"
      eternal="false"
      timeToIdleSeconds="120"
      timeToLiveSeconds="120"
      overflowToDisk="false"
      />

   <cache name="ru.xxx.common.security.BusinessClass"
      maxElementsInMemory="10"
      eternal="true"
      timeToIdleSeconds="0"
      timeToLiveSeconds="0"
      overflowToDisk="false"
      />

   <cache name="ru.xxx.common.security.BusinessAction"
      maxElementsInMemory="10"
      eternal="true"
      timeToIdleSeconds="0"
      timeToLiveSeconds="0"
      overflowToDisk="false"
      />

   <cache name="ru.xxx.common.security.BusinessPermission"
      maxElementsInMemory="100"
      eternal="true"
      timeToIdleSeconds="600"
      timeToLiveSeconds="2400"
      overflowToDisk="false"
      />
</ehcache>

<cache name="ru.xxx.common.security.BusinessPermission"
      maxElementsInMemory="100"
      eternal="false"
      timeToIdleSeconds="600"
      timeToLiveSeconds="2400"
      overflowToDisk="false"
      />

public class Side implements Serializable {
    public static final Side INTRUDER = new Side("INTRUDER");
    public static final Side GUARD = new Side("GUARD");
    public static final Side NEUTRAL = new Side("NEUTRAL");

    private String name;

    private Side() {
    }

    private Side(String name) {
        this.name = name;
    }

    public String toString() {
        return name;
    }
}

public class SyntheticEntity {

    private Side side;

    public void setSide(Side side) {
        this.side = side;
    }

    public Side getSide() {
            return side;
    }
}