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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/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11703" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-c32c8455-a962-4cf6-8607-ccce003eec2c" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11703" style="color: #3b73af; text-decoration: none">HHH-11703</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/HHH-11703" style="color: #3b73af; text-decoration: none">Entity with Natural ID not being cached in the persistenceContext, causing extra queries</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: 0; 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-c32c8455-a962-4cf6-8607-ccce003eec2c" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.2.10 </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">Assignee:</th>
<td style="padding: 0; 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">Attachments:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> test-case.zip </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">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 27/Apr/2017 13:42 PM </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">Environment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Hibernate 5.2.10 </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">Priority:</th>
<td class="has-icon" style="padding: 0; 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-e317d200-e187-420d-b7d7-762f404448c0" 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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="jcmoreira" id="email_jcmoreira" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=jcmoreira" style="color:#6c797f;; color: #3b73af; text-decoration: none">Joao Carlos Heringer Moreira</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">I am building an app connecting to a legacy database where almost all entities have properties linked to a lookup table representing their properties, so that the properties can have new values added at runtime by a generic mechanism.<br> Since i can't change the schema, the way i found to map this situation is with these two sample classes:</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
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Property <span class="code-keyword" style="color: #000091">implements</span> Serializable{
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Integer</span> id;
@NaturalId
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Integer</span> code;
@NaturalId
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Integer</span> item;
...
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">and</p>
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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
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Entit <span class="code-keyword" style="color: #000091">implements</span> Serializable{
@Id
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Integer</span> id;
@ManyToOne
@JoinColumns({
@JoinColumn(name=<span class="code-quote" style="color: #009100">"PROP_CODE"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"CODE"</span>),
@JoinColumn(name=<span class="code-quote" style="color: #009100">"PROP_ITEM"</span>, referencedColumnName = <span class="code-quote" style="color: #009100">"ITEM"</span>)
})
<span class="code-keyword" style="color: #000091">private</span> Property prop;
...
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It works, but i am having some performance problems when loading Entits referencing the same properties, even within a single session. My understanding is that if i load an Entit 1 that is linked to a Property 1 and and Entit 2 that is linked to the same Property 1, i would have, at most, 3 queries, one to load Entit 1, one to load Property 1 and then one to load Entit 2. When populating Entit 2, Property 1 should already be on the persistenceContext , so it should be retrieved there.<br> Currently, my test shoots 4 queries. One to load Entit 1, one to load Property 1, one to load Entit 2 and then another one (repeated) to load Property 1 again.</p> </td>
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{
"@context": "http://schema.org",
"@type": "EmailMessage",
"description": "View Issue",
"potentialAction": {
"@type": "ViewAction",
"target": "https://hibernate.atlassian.net/browse/HHH-11703?inbox=true&",
"name": "View Issue"
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"name": "Atlassian",
"url": "https://www.atlassian.com"
}
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