hibernate lazy init not lazy at all!

I have an entity which has a collection as one of its attributes. That collection is mapped with a @ManyToMany annotation with fetch type lazy. The target entity also has collections as attributes, some are @OneToMany and some are @ManyToMany. When fetching the first entity (via entityManager.find(id)) its collection attribute is populated and furthermore the elements of the collection are fully populated as well (i.e. the collections a filled) so i get many canonicalized objects. As I understand describing an attribute as lazy fetched should prevent the collection from being filled. Am I wrong or just doing something wrong?

Thank you.

The entities (only two here for the example):

@Entity
@Table(name="buys")
@XStreamAlias("buy")
public class Buy implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public enum AutoMode {AUTO, MANUAL};
    public enum Bool {FALSE,TRUE};
    public enum Frequency {FREQ1, FREQ2};
    public enum Status {STATUS1, STATUS2};

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @XStreamAsAttribute
    @Column(name = "id")
    private Long id;

    /*
    @JoinColumn(name="agency_id")
    @XStreamAlias("agencyId")
    @ManyToOne(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    private Agency agencyId;
    */

    @Column(name = "agency_id")
    @XStreamAlias("agencyId")
    private long agencyId;

    @Column(name = "auction_date")
    @Temporal(TemporalType.DATE)
    @XStreamAlias("auction")
    private Date auctionDate;

    @Column(name = "pre_auction_date")
    @Temporal(TemporalType.DATE)
    @XStreamAlias("pre-auction")
    private Date preAuctionDate;

    @Column(name = "send_feedback_auto_mode")
    @XStreamAlias("auto-send")
    @Enumerated(EnumType.ORDINAL)
    private AutoMode sendFeedbackAutoMode;

    @Column(name = "campaign_budget")
    @XStreamAlias("budget")
    private Integer budget;

    @Column(name = "price_ceiling")
    @XStreamAlias("price-ceiling")
    @Min(value = 1, message = "Price ceiling should be greater then 0")
    private Double priceCeiling;

    /*
    @ManyToOne( cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    @JoinColumn(name="campaign_id")
    private Campaign campaign;
    */

    @Column(name = "campaign_id")
    @XStreamAlias("campaignId")
    private long campaign;

    @Column(name = "avg_bid_received")
    @XStreamAlias("avgBigReceived")
    private double avgBid;

    @Column(name = "maximum_unique_users")
    @XStreamAlias("maxUniqueUsers")
    private int maxUniqueUsers;

    @Column(name = "optimize_method")
    @XStreamAlias("optimzeMethod")
    private int optimzeMethod;

    @Column(name = "frequency")
    @XStreamAlias("frequency")
    private int frequency;

    @Column(name = "frequency_type")
    @XStreamAlias("frequency_type")
    @Enumerated(EnumType.ORDINAL)
    private Frequency frequencyType;

    @Column(name = "additional_info")
    @XStreamAlias("additionalInfo")
    private String additionalInfo;

    @Column(name = "support_oob")
    @XStreamAlias("oob")
    @Enumerated(EnumType.ORDINAL)
    private Bool supportOOB;

    @Column(name = "support_in_banner")
    @XStreamAlias("ib")
    @Enumerated(EnumType.ORDINAL)
    private Bool supportIB;

    @Column(name = "status")
    @XStreamAlias("status")
    @Enumerated(EnumType.ORDINAL)
    private Status status;

    @Version
    @Column(name = "version")
    @XStreamAsAttribute
    private Integer version;

    @ManyToMany(fetch=FetchType.LAZY,cascade = { CascadeType.MERGE, CascadeType.PERSIST})
    @JoinTable( name="buy_ad_sizes", joinColumns=@JoinColumn(name="buy_id"),inverseJoinColumns=@JoinColumn(name="ad_size_id"))
    @XStreamAlias("adSizes")
    private List<AdUnit> adSizes;

    @ManyToMany(fetch=FetchType.LAZY,cascade = { CascadeType.MERGE, CascadeType.PERSIST})
    @JoinTable( name="buy_profiles", joinColumns=@JoinColumn(name="buy_id"),inverseJoinColumns=@JoinColumn(name="profile_id"))
    @XStreamAlias("profiles")
    private List<Profile> profiles;

    @JoinColumn(name="buy_id")
    @OneToM开发者_如何学JAVAany(fetch=FetchType.LAZY,cascade = { CascadeType.MERGE, CascadeType.PERSIST})
    @XStreamAlias("mediaPlans")
    private List<MediaPlan> mediaPlans;

    @JoinColumn(name = "buy_id")
    @OneToMany(fetch=FetchType.LAZY,cascade = { CascadeType.MERGE, CascadeType.PERSIST})
    @XStreamAlias("publisherProposals")
    private List<PublisherProposal> publisherProposals;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Integer getVersion() {
        return version;
    }

    public void setVersion(Integer version) {
        this.version = version;
    }

    public Date getAuctionDate() {
        return auctionDate;
    }

    public void  setAuctionDate(Date auctionDate) {
         this.auctionDate = auctionDate;
    }

    public Date getPreAuctionDate() {
        return preAuctionDate;
    }

    public void  setPreAuctionDate(Date preAuctionDate) {
         this.preAuctionDate = preAuctionDate;
    }

    public Integer getBudget() {
        return budget;
    }

    public void setBudget(Integer budget) {
        this.budget = budget;
    }

    public Double getPriceCeiling() {
        return priceCeiling;
    }

    public void setPriceCeiling(Double priceCeiling) {
        this.priceCeiling = priceCeiling;
    }

    public AutoMode getSendFeedbackAutoMode() {
        return sendFeedbackAutoMode;
    }

    public void setSendFeedbackAutoMode(AutoMode sendFeedbackAutoMode) {
        this.sendFeedbackAutoMode = sendFeedbackAutoMode;
    }

    public double getAvgBid() {
        return avgBid;
    }

    public void setAvgBid(double avgBid) {
        this.avgBid = avgBid;
    }

    public int getMaxUniqueUsers() {
        return maxUniqueUsers;
    }

    public void setMaxUniqueUsers(int maxUniqueUsers) {
        this.maxUniqueUsers = maxUniqueUsers;
    }

    public int getOptimzeMethod() {
        return optimzeMethod;
    }

    public void setOptimzeMethod(int optimzeMethod) {
        this.optimzeMethod = optimzeMethod;
    }

    public int getFrequency() {
        return frequency;
    }

    public void setFrequency(int frequency) {
        this.frequency = frequency;
    }

    public Frequency getFrequencyType() {
        return frequencyType;
    }

    public void setFrequencyType(Frequency frequencyType) {
        this.frequencyType = frequencyType;
    }

    public String getAdditionalInfo() {
        return additionalInfo;
    }

    public void setAdditionalInfo(String additionalInfo) {
        this.additionalInfo = additionalInfo;
    }

    public Bool getSupportOOB() {
        return supportOOB;
    }

    public List<AdUnit> getAdSizes() {
        return adSizes;
    }

    public void setAdSizes(List<AdUnit> adSizes) {
        this.adSizes = adSizes;
    }

    public void setSupportOOB(Bool supportOOB) {
        this.supportOOB = supportOOB;
    }

    public Bool getSupportIB() {
        return supportIB;
    }

    public void setSupportIB(Bool supportIB) {
        this.supportIB = supportIB;
    }

    public Status getStatus() {
        return status;
    }

    public void setStatus(Status status) {
        this.status = status;
    }

    public List<Profile> getProfiles() {
        return profiles;
    }

    public void setProfiles(List<Profile> profiles) {
        this.profiles = profiles;
    }

    public List<MediaPlan> getMediaPlans() {
        return mediaPlans;
    }

    public void setMediaPlans(List<MediaPlan> mediaPlans) {
        this.mediaPlans = mediaPlans;
    }

    public List<PublisherProposal> getPublisherProposals() {
        return publisherProposals;
    }

    public void setPublisherProposals(List<PublisherProposal> publisherProposals) {
        this.publisherProposals = publisherProposals;
    }

    public long getAgencyId() {
        return agencyId;
    }

    public void setAgencyId(long agencyId) {
        this.agencyId = agencyId;
    }

    public long getCampaign() {
        return campaign;
    }

    public void setCampaign(long campaign) {
        this.campaign = campaign;
    }



}

second entity:

@Entity
@Table(name = "ad_units")
@XStreamAlias("adunit")
public class AdUnit {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    @XStreamAsAttribute
    private Long id;

    @Column(unique=true, nullable=false )
    @XStreamAsAttribute
    private String name;

    @Column(name="full_name",nullable=false )
    @XStreamAlias("full-name")
    private String fullName;

    @XStreamAlias("width")
    private Integer width;

    @XStreamAlias("height")
    private Integer height;

    @XStreamAlias("type")
    private String type;

    @ManyToMany(fetch = FetchType.LAZY, cascade = {CascadeType.PERSIST, CascadeType.MERGE}, mappedBy = "adSizes", targetEntity = Publisher.class)
    private List<Publisher> publishers;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getFullName() {
        return fullName;
    }

    public void setFullName(String fullName) {
        this.fullName = fullName;
    }

    public Integer getWidth() {
        return width;
    }

    public void setWidth(Integer width) {
        this.width = width;
    }

    public Integer getHeight() {
        return height;
    }

    public void setHeight(Integer height) {
        this.height = height;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public List<Publisher> getPublishers() {
        return publishers;
    }

    public void setPublishers(List<Publisher> publishers) {
        this.publishers = publishers;
    }
}

the returned object:

<buy id="1" version="0">
  <agencyId>1</agencyId>
  <auction class="sql-date">2010-09-25</auction>
  <pre-auction class="sql-date">2010-09-25</pre-auction>
  <auto-send>AUTO</auto-send>
  <budget>1000</budget>
  <price-ceiling>5.0</price-ceiling>
  <campaignId>0</campaignId>
  <avgBigReceived>5.5</avgBigReceived>
  <maxUniqueUsers>7</maxUniqueUsers>
  <optimzeMethod>3</optimzeMethod>
  <frequency>0</frequency>
  <frequency__type>FREQ1</frequency__type>
  <additionalInfo>none</additionalInfo>
  <oob>TRUE</oob>
  <ib>FALSE</ib>
  <status>STATUS1</status>
  <adSizes>
    <adunit id="1" name="300X250">
      <full-name>300 x 250 IMU - (Medium Rectangle)</full-name>
      <width>300</width>
      <height>250</height>
      <type>Popups &amp; Rectangles</type>
      <publishers>
        <publisher id="2">
          <name>publisher2</name>
          <profiles/>
          <proposals>
            <proposal id="0" version="0">
              <publisherId>2</publisherId>
              <buyId>1</buyId>
              <creationDate class="sql-date">2010-11-11</creationDate>
              <lastUpdated class="sql-date">2010-11-11</lastUpdated>
              <cpm>5.0</cpm>
              <minimumSpend>100</minimumSpend>
              <info>none</info>
              <revealUsers>FALSE</revealUsers>
              <status>STATUS1</status>
              <mediaPlanProposals/>
            </proposal>
          </proposals>
          <adSizes>
            <adunit reference="../../../.."/>
            <adunit id="3" name="240X400">
              <full-name>240 x 400 IMU - (Vertical Rectangle)</full-name>
              <width>240</width>
              <height>240</height>
              <type>Popups &amp; Rectangles</type>
              <publishers>
                <publisher reference="../../../.."/>
              </publishers>
            </adunit>
          </adSizes>
        </publisher>
      </publishers>
    </adunit>
  </adSizes>
  <profiles/>
  <mediaPlans/>
  <publisherProposals>
    <proposal reference="../../adSizes/adunit/publishers/publisher/proposals/proposal"/>
  </publisherProposals>
</buy>

As you can see the object contains the collection which were defined as lazy fetched and furthermore the collections inside the collections are fetched.

The debug output with queries:

[http-8080-1] DEBUG org.hibernate.SQL - select buy0_.id as id0_0_, buy0_.additional_info as additional2_0_0_, buy0_.agency_id as agency3_0_0_, buy0_.auction_date as auction4_0_0_, buy0_.avg_bid_received as avg5_0_0_, buy0_.campaign_budget as campaign6_0_0_, buy0_.campaign_id as campaign7_0_0_, buy0_.frequency as frequency0_0_, buy0_.frequency_type as frequency9_0_0_, buy0_.maximum_unique_users as maximum10_0_0_, buy0_.optimize_method as optimize11_0_0_, buy0_.pre_auction_date as pre12_0_0_, buy0_.price_ceiling as price13_0_0_, buy0_.send_feedback_auto_mode as send14_0_0_, buy0_.status as status0_0_, buy0_.support_in_banner as support16_0_0_, buy0_.support_oob as support17_0_0_, buy0_.version as version0_0_ from buys buy0_ where buy0_.id=?
Hibernate: select buy0_.id as id0_0_, buy0_.additional_info as additional2_0_0_, buy0_.agency_id as agency3_0_0_, buy0_.auction_date as auction4_0_0_, buy0_.avg_bid_received as avg5_0_0_, buy0_.campaign_budget as campaign6_0_0_, buy0_.campaign_id as campaign7_0_0_, buy0_.frequency as frequency0_0_, buy0_.frequency_type as frequency9_0_0_, buy0_.maximum_unique_users as maximum10_0_0_, buy0_.optimize_method as optimize11_0_0_, buy0_.pre_auction_date as pre12_0_0_, buy0_.price_ceiling as price13_0_0_, buy0_.send_feedback_auto_mode as send14_0_0_, buy0_.status as status0_0_, buy0_.support_in_banner as support16_0_0_, buy0_.support_oob as support17_0_0_, buy0_.version as version0_0_ from buys buy0_ where buy0_.id=?

[http-8080-1] DEBUG org.hibernate.pretty.Printer - com.legolas.model.Buy{budget=1000, supportIB=0, avgBid=5.5, status=0, priceCeiling=5.0, maxUniqueUsers=7, optimzeMethod=3, frequency=0, additionalInfo=none, agencyId=1, frequencyType=0, version=0, sendFeedbackAutoMode=0, id=1, mediaPlans=<uninitialized>, adSizes=<uninitialized>, profiles=<uninitialized>, campaign=0, supportOOB=1, publisherProposals=<uninitialized>, preAuctionDate=25  september 2010, auctionDate=25  september 2010}

[http-8080-1] DEBUG org.hibernate.SQL - select adsizes0_.buy_id as buy1_1_, adsizes0_.ad_size_id as ad2_1_, adunit1_.id as id1_0_, adunit1_.full_name as full2_1_0_, adunit1_.height as height1_0_, adunit1_.name as name1_0_, adunit1_.type as type1_0_, adunit1_.width as width1_0_ from buy_ad_sizes adsizes0_ left outer join ad_units adunit1_ on adsizes0_.ad_size_id=adunit1_.id where adsizes0_.buy_id=?
Hibernate: select adsizes0_.buy_id as buy1_1_, adsizes0_.ad_size_id as ad2_1_, adunit1_.id as id1_0_, adunit1_.full_name as full2_1_0_, adunit1_.height as height1_0_, adunit1_.name as name1_0_, adunit1_.type as type1_0_, adunit1_.width as width1_0_ from buy_ad_sizes adsizes0_ left outer join ad_units adunit1_ on adsizes0_.ad_size_id=adunit1_.id where adsizes0_.buy_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select publishers0_.adsize_id as adsize2_1_, publishers0_.publisher_id as publisher1_1_, publisher1_.publisher_id as id5_0_, publisher1_1_.name as name5_0_, publisher1_.name as name14_0_ from publishers_adsizes publishers0_ left outer join publishers publisher1_ on publishers0_.publisher_id=publisher1_.publisher_id left outer join accounts publisher1_1_ on publisher1_.publisher_id=publisher1_1_.id where publishers0_.adsize_id=?
Hibernate: select publishers0_.adsize_id as adsize2_1_, publishers0_.publisher_id as publisher1_1_, publisher1_.publisher_id as id5_0_, publisher1_1_.name as name5_0_, publisher1_.name as name14_0_ from publishers_adsizes publishers0_ left outer join publishers publisher1_ on publishers0_.publisher_id=publisher1_.publisher_id left outer join accounts publisher1_1_ on publisher1_.publisher_id=publisher1_1_.id where publishers0_.adsize_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select profiles0_.publisher_id as publisher3_1_, profiles0_.id as id1_, profiles0_.id as id9_0_, profiles0_.profile_id as profile2_9_0_, profiles0_.publisher_id as publisher3_9_0_, profiles0_.reach as reach9_0_, profiles0_.stamped as stamped9_0_, profiles0_.targeting_name as targeting6_9_0_, profiles0_.users_on_site as users7_9_0_ from publisher_profiles profiles0_ where profiles0_.publisher_id=?
Hibernate: select profiles0_.publisher_id as publisher3_1_, profiles0_.id as id1_, profiles0_.id as id9_0_, profiles0_.profile_id as profile2_9_0_, profiles0_.publisher_id as publisher3_9_0_, profiles0_.reach as reach9_0_, profiles0_.stamped as stamped9_0_, profiles0_.targeting_name as targeting6_9_0_, profiles0_.users_on_site as users7_9_0_ from publisher_profiles profiles0_ where profiles0_.publisher_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select proposals0_.publisher_id as publisher9_1_, proposals0_.id as id1_, proposals0_.id as id4_0_, proposals0_.additional_info as additional2_4_0_, proposals0_.buy_id as buy3_4_0_, proposals0_.cpm as cpm4_0_, proposals0_.creation_date as creation5_4_0_, proposals0_.last_updated as last6_4_0_, proposals0_.minimum_spend as minimum7_4_0_, proposals0_.proposal_status as proposal8_4_0_, proposals0_.publisher_id as publisher9_4_0_, proposals0_.reveal_num_of_users as reveal10_4_0_, proposals0_.version as version4_0_ from publishers_proposals proposals0_ where proposals0_.publisher_id=?
Hibernate: select proposals0_.publisher_id as publisher9_1_, proposals0_.id as id1_, proposals0_.id as id4_0_, proposals0_.additional_info as additional2_4_0_, proposals0_.buy_id as buy3_4_0_, proposals0_.cpm as cpm4_0_, proposals0_.creation_date as creation5_4_0_, proposals0_.last_updated as last6_4_0_, proposals0_.minimum_spend as minimum7_4_0_, proposals0_.proposal_status as proposal8_4_0_, proposals0_.publisher_id as publisher9_4_0_, proposals0_.reveal_num_of_users as reveal10_4_0_, proposals0_.version as version4_0_ from publishers_proposals proposals0_ where proposals0_.publisher_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select mpproposal0_.proposal_id as proposal9_1_, mpproposal0_.id as id1_, mpproposal0_.id as id2_0_, mpproposal0_.budget as budget2_0_, mpproposal0_.comments as comments2_0_, mpproposal0_.cpm as cpm2_0_, mpproposal0_.exclusive_reach as exclusive5_2_0_, mpproposal0_.frequency_cap as frequency6_2_0_, mpproposal0_.impressions as impressi7_2_0_, mpproposal0_.mediaplan_id as mediaplan8_2_0_, mpproposal0_.proposal_id as proposal9_2_0_, mpproposal0_.reach as reach2_0_ from mediaplan_proposals mpproposal0_ where mpproposal0_.proposal_id=?
Hibernate: select mpproposal0_.proposal_id as proposal9_1_, mpproposal0_.id as id1_, mpproposal0_.id as id2_0_, mpproposal0_.budget as budget2_0_, mpproposal0_.comments as comments2_0_, mpproposal0_.cpm as cpm2_0_, mpproposal0_.exclusive_reach as exclusive5_2_0_, mpproposal0_.frequency_cap as frequency6_2_0_, mpproposal0_.impressions as impressi7_2_0_, mpproposal0_.mediaplan_id as mediaplan8_2_0_, mpproposal0_.proposal_id as proposal9_2_0_, mpproposal0_.reach as reach2_0_ from mediaplan_proposals mpproposal0_ where mpproposal0_.proposal_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select adsizes0_.publisher_id as publisher1_1_, adsizes0_.adsize_id as adsize2_1_, adunit1_.id as id1_0_, adunit1_.full_name as full2_1_0_, adunit1_.height as height1_0_, adunit1_.name as name1_0_, adunit1_.type as type1_0_, adunit1_.width as width1_0_ from publishers_adsizes adsizes0_ left outer join ad_units adunit1_ on adsizes0_.adsize_id=adunit1_.id where adsizes0_.publisher_id=?
Hibernate: select adsizes0_.publisher_id as publisher1_1_, adsizes0_.adsize_id as adsize2_1_, adunit1_.id as id1_0_, adunit1_.full_name as full2_1_0_, adunit1_.height as height1_0_, adunit1_.name as name1_0_, adunit1_.type as type1_0_, adunit1_.width as width1_0_ from publishers_adsizes adsizes0_ left outer join ad_units adunit1_ on adsizes0_.adsize_id=adunit1_.id where adsizes0_.publisher_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select publishers0_.adsize_id as adsize2_1_, publishers0_.publisher_id as publisher1_1_, publisher1_.publisher_id as id5_0_, publisher1_1_.name as name5_0_, publisher1_.name as name14_0_ from publishers_adsizes publishers0_ left outer join publishers publisher1_ on publishers0_.publisher_id=publisher1_.publisher_id left outer join accounts publisher1_1_ on publisher1_.publisher_id=publisher1_1_.id where publishers0_.adsize_id=?
Hibernate: select publishers0_.adsize_id as adsize2_1_, publishers0_.publisher_id as publisher1_1_, publisher1_.publisher_id as id5_0_, publisher1_1_.name as name5_0_, publisher1_.name as name14_0_ from publishers_adsizes publishers0_ left outer join publishers publisher1_ on publishers0_.publisher_id=publisher1_.publisher_id left outer join accounts publisher1_1_ on publisher1_.publisher_id=publisher1_1_.id where publishers0_.adsize_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select profiles0_.buy_id as buy1_1_, profiles0_.profile_id as profile2_1_, profile1_.id as id12_0_, profile1_.agency_id as agency2_12_0_, profile1_.name as name12_0_ from buy_profiles profiles0_ left outer join profiles profile1_ on profiles0_.profile_id=profile1_.id where profiles0_.buy_id=?
Hibernate: select profiles0_.buy_id as buy1_1_, profiles0_.profile_id as profile2_1_, profile1_.id as id12_0_, profile1_.agency_id as agency2_12_0_, profile1_.name as name12_0_ from buy_profiles profiles0_ left outer join profiles profile1_ on profiles0_.profile_id=profile1_.id where profiles0_.buy_id=?



[http-8080-1] DEBUG org.hibernate.SQL - select mediaplans0_.buy_id as buy2_1_, mediaplans0_.id as id1_, mediaplans0_.id as id11_0_, mediaplans0_.buy_id as buy2_11_0_, mediaplans0_.is_final as is3_11_0_ from mediaplans mediaplans0_ where mediaplans0_.buy_id=?
Hibernate: select mediaplans0_.buy_id as buy2_1_, mediaplans0_.id as id1_, mediaplans0_.id as id11_0_, mediaplans0_.buy_id as buy2_11_0_, mediaplans0_.is_final as is3_11_0_ from mediaplans mediaplans0_ where mediaplans0_.buy_id=?

[http-8080-1] DEBUG org.hibernate.SQL - select publisherp0_.buy_id as buy3_1_, publisherp0_.id as id1_, publisherp0_.id as id4_0_, publisherp0_.additional_info as additional2_4_0_, publisherp0_.buy_id as buy3_4_0_, publisherp0_.cpm as cpm4_0_, publisherp0_.creation_date as creation5_4_0_, publisherp0_.last_updated as last6_4_0_, publisherp0_.minimum_spend as minimum7_4_0_, publisherp0_.proposal_status as proposal8_4_0_, publisherp0_.publisher_id as publisher9_4_0_, publisherp0_.reveal_num_of_users as reveal10_4_0_, publisherp0_.version as version4_0_ from publishers_proposals publisherp0_ where publisherp0_.buy_id=?
Hibernate: select publisherp0_.buy_id as buy3_1_, publisherp0_.id as id1_, publisherp0_.id as id4_0_, publisherp0_.additional_info as additional2_4_0_, publisherp0_.buy_id as buy3_4_0_, publisherp0_.cpm as cpm4_0_, publisherp0_.creation_date as creation5_4_0_, publisherp0_.last_updated as last6_4_0_, publisherp0_.minimum_spend as minimum7_4_0_, publisherp0_.proposal_status as proposal8_4_0_, publisherp0_.publisher_id as publisher9_4_0_, publisherp0_.reveal_num_of_users as reveal10_4_0_, publisherp0_.version as version4_0_ from publishers_proposals publisherp0_ where publisherp0_.buy_id=?

Posting my comment as answer: I wonder if this is not a side effect of the XML serialization. Can you confirm this also occurs when no XML serialization is involved?

Did you get the output before closing the session?

Imagine that you do something like:

Session session = sessionFactory.openSession();

Query query = session.createQuery("From Buy where id =xxxx");
Buy buy = (Buy) query.uniqueResult();

//Here you have access to the whole graph, so you can get any child
buy.profiles().iterator.next(); // that will work

session.close();

//After here, you won't be able to access to any collection.

//If you try to do this you will get a Lazy Initialization Exception
buy.profiles().iterator().next();

Please find some examples here:

http://ignaciosuay.com/how-to-avoid-hibernate-lazy-initialization-exception/