class User {
//some properties
static hasMany=[photos:PhotoUpload]
static mappings={
    photos lazy: false
}

class LoginController {
...
def u= User.findByEmailAndPassword(email,password,[fetch: [photos: 'select']]);
if(u!=null) {
session.user=u
session.user=u
        chain(action:"login_success")
    }else {
        chain(action:"login_failure")
    }
}

def login_success={ render(view: '/user/profile') }
}

<h1>${user?.photos==null}</h1>
<!-- I am getting "true"  ,if i remove lazy:flalse,fetch:join for photos property
of User,otherwise i am getting Excpetion : org.hibernate.LazyInitializationException-->
<g:each var="photo" in="${session?.user?.photos}">
<div class="row image_container">
<div class="col-xs-12 col-sm-5 col-md-5 col-lg-6 col-lg-offset-3">
<a href="#x">
<img src="data:image/*;base64,${photo.photo.getBytes()}" alt="Image"
 class="thumbnail img-responsive" />
</a>
<div class="caption">
<h3 class="reponsive-font">${photo.name}</h3>
<p class="reponsive-font">${photo.description}</p>
</div>
</div>
</div>