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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-10648" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-330ced43-7d18-40e0-b896-8d0991a512ef" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10648" style="color: #3b73af; text-decoration: none">HHH-10648</a> </td>
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<td style="vertical-align: top;; padding: 0px; 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/HHH-10648" style="color: #3b73af; text-decoration: none">No MultipleBagFetchException is thrown when fetching two bags eagerly</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-330ced43-7d18-40e0-b896-8d0991a512ef" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"> New Feature </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.1.0 </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 25/Mar/2016 07:43 AM </td>
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-314985d7-4806-4039-8393-9610176837c1" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="mih_vlad" id="email_mih_vlad" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mih_vlad" style="color:#6c797f;; color: #3b73af; text-decoration: none">Vlad Mihalcea</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">Assuming the following mapping:</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity(name = <span class="code-quote" style="color: #009100">"Post"</span>)
@Table(name = <span class="code-quote" style="color: #009100">"post"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> class Post {
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> id;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> title;
@OneToMany(fetch = FetchType.EAGER)
<span class="code-keyword" style="color: #000091">private</span> List<PostComment> comments = <span class="code-keyword" style="color: #000091">new</span> ArrayList<>();
@ManyToMany(fetch = FetchType.EAGER)
@JoinTable(name = <span class="code-quote" style="color: #009100">"post_tag"</span>,
joinColumns = @JoinColumn(name = <span class="code-quote" style="color: #009100">"post_id"</span>),
inverseJoinColumns = @JoinColumn(name = <span class="code-quote" style="color: #009100">"tag_id"</span>)
)
<span class="code-keyword" style="color: #000091">private</span> List<Tag> tags = <span class="code-keyword" style="color: #000091">new</span> ArrayList<>();
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">When fetching the <tt>Post</tt> entity directly:</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Post post = entityManager.find(Post.class, 1L);
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Hibernate generates the following SQL:</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-sql" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">SELECT</span> eagerfetch0_.id AS id1_0_0_ ,
eagerfetch0_.title AS title2_0_0_ ,
comments1_.Post_id AS Post_id1_2_1_ ,
eagerfetch2_.id AS comments2_2_1_ ,
eagerfetch2_.id AS id1_1_2_ ,
eagerfetch2_.review AS review2_1_2_ ,
tags3_.post_id AS post_id1_3_3_ ,
eagerfetch4_.id AS tag_id2_3_3_ ,
eagerfetch4_.id AS id1_4_4_ ,
eagerfetch4_.name AS name2_4_4_
<span class="code-keyword" style="color: #000091">FROM</span> post eagerfetch0_
LEFT OUTER JOIN post_post_comment comments1_ ON eagerfetch0_.id = comments1_.Post_id
LEFT OUTER JOIN post_comment eagerfetch2_ ON comments1_.comments_id = eagerfetch2_.id
LEFT OUTER JOIN post_tag tags3_ ON eagerfetch0_.id = tags3_.post_id
LEFT OUTER JOIN tag eagerfetch4_ ON tags3_.tag_id = eagerfetch4_.id
<span class="code-keyword" style="color: #000091">WHERE</span> eagerfetch0_.id = 1
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">But if we try to execute an HQL query:</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Post post = entityManager.createQuery(
<span class="code-quote" style="color: #009100">"select p "</span> +
<span class="code-quote" style="color: #009100">"from Post p "</span> +
<span class="code-quote" style="color: #009100">"join fetch p.tags "</span> +
<span class="code-quote" style="color: #009100">"join fetch p.comments "</span> +
<span class="code-quote" style="color: #009100">"where p.id = :id"</span>, Post.class)
.setParameter(<span class="code-quote" style="color: #009100">"id"</span>, postId)
.getSingleResult();
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We get the expected exception which used to be thrown in Hibernate 4.x.</p>
<div class="preformatted 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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">javax.persistence.PersistenceException: org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1692)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1602)
</pre>
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