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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/BVAL?atlOrigin=eyJpIjoiYjNlMTU2NDAyOGQyNGM1OTljYWY2ZDYyZDA5ODE4ZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Bean Validation</a> / <a href="https://hibernate.atlassian.net/browse/BVAL-757?atlOrigin=eyJpIjoiYjNlMTU2NDAyOGQyNGM1OTljYWY2ZDYyZDA5ODE4ZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-95c7c825-b2d4-4d65-8e94-b4924989ab92" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/BVAL-757?atlOrigin=eyJpIjoiYjNlMTU2NDAyOGQyNGM1OTljYWY2ZDYyZDA5ODE4ZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">BVAL-757</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/BVAL-757?atlOrigin=eyJpIjoiYjNlMTU2NDAyOGQyNGM1OTljYWY2ZDYyZDA5ODE4ZTIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Lazy fetch type doesn't work for identical objects</a> </span> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 31/Jul/2020 11:06 AM </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="xsetthe" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_xsetthe" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A2d33e13b-599f-4307-bedc-4709c2198945"> Xset </a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">There is User Entity:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"users"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Long</span> id;
...
@Column(nullable = <span class="code-keyword" style="color: #000091">false</span>)
@OneToMany(fetch = FetchType.LAZY, mappedBy = <span class="code-quote" style="color: #009100">"user"</span>)
<span class="code-keyword" style="color: #000091">public</span> Set<UserPermission> permissions;
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There is permission entity:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"user_permissions"</span>, indexes = {@Index(unique = <span class="code-keyword" style="color: #000091">true</span>, columnList = <span class="code-quote" style="color: #009100">"id"</span>)})
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>UserPermission {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">Long</span> id;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = <span class="code-quote" style="color: #009100">"user_id"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"id"</span>)
<span class="code-keyword" style="color: #000091">public</span> User user;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = <span class="code-quote" style="color: #009100">"target_user_id"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"id"</span>)
<span class="code-keyword" style="color: #000091">public</span> User targetUser;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = <span class="code-quote" style="color: #009100">"other_entity"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"id"</span>)
<span class="code-keyword" style="color: #000091">public</span> OtherEntity otherEntity;
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There is User Entity:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@Entity<br> @Table(name = "users")<br> public class User </p> { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) public Long id; ... @Column(nullable = false) @OneToMany(fetch = FetchType.LAZY, mappedBy = "user") public Set<UserPermission> permissions; } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There is permission entity:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@Entity<br> @Table(name = "user_permissions", indexes = </p> {@Index(unique = true, columnList = "id")} <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">)<br> public class UserPermission </p> { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) public Long id; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "user_id", referencedColumnName = "id") public User user; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "target_user_id", referencedColumnName = "id") public User targetUser; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "other_entity", referencedColumnName = "id") public OtherEntity otherEntity; } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I use this code to fetch user entity:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
... get session
... open transaction
<span class="code-comment" style="color: #808080">// fetching user
</span><span class="code-keyword" style="color: #000091">final</span> User user = session.find(User.class, id);
<span class="code-comment" style="color: #808080">// fetching permissions
</span><span class="code-keyword" style="color: #000091">final</span> Set<UserPermission> userPermissions = user.permissions;
<span class="code-comment" style="color: #808080">// foreach permissions
</span><span class="code-comment" style="color: #808080">// HIBERNATE FETCHES HERE targetUser AND EVERYTHING CONNECTED TO THIS ENTITY, LOOKS LIKE FetchType.EAGER
</span>
<span class="code-keyword" style="color: #000091">for</span> (UserPermission permission: userPermissions) {
<span class="code-comment" style="color: #808080">// there is no code
</span>}
... close transaction
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Look at the comment in code above:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// HIBERNATE FETCHES HERE targetUser AND EVERYTHING CONNECTED TO THIS ENTITY, LOOKS LIKE FetchType.EAGER</span>
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It means, that without any calls to targetUser, hibernate fetches it. That's really strange. This behavior really slows down performance of my application.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">My assumption: Hibernate just can't proxy two similar objects in one entity (i mean, user and targetUser have the same class, hibernate cannot proxy both objects and thats why it fetches targetUser immediately)</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">How to solve this problem? Any suggestions?</p> </td>
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