并从休眠状态进行延迟加载

<h:selectOneMenu>

<h:selectOneMenu value=\"#{bean.value}\">
  <f:selectItems value=\"#{dao.valuesFromDb}\" />
</h:selectOneMenu>

#{bean.value}

Region

#{dao.valuesFromDb}

#{bean.value}

#{dao.valuesFromDb}

equals

false

equals

equals

equals

bean

Region

@Override
public boolean equals(Object obj) {
    if (this == obj) {return true;}
    if (obj == null) {return false;}
    if (!(obj instanceof Region)) {return false;}

    Region region = (Region) obj;

    if ((name == null) && (region.getName() != null)) {return false;}  // Do NOT use \'region.name\' here
    else if (!name.equals(region.getName())) {return false;}           // Do NOT use \'region.name\' here
    return true;
}

Region

bean.getRegion()