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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: 10px 0 0; margin-top: 0">Caching by natural ID is already supported (see <a href="http://docs.jboss.org/hibernate/orm/5.1/userguide/html_single/Hibernate_User_Guide.html#naturalid-mutability-caching" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://docs.jboss.org/hibernate/orm/5.1/userguide/html_single/Hibernate_User_Guide.html#naturalid-mutability-caching</a>)</p> <p style="margin: 10px 0 0">Unfortunately there are some restrictions on natural IDs, so it is an incomplete solution for the general problem:</p> <p style="margin: 10px 0 0">an entity can only have 1 natural ID (which can include 1 or more attributes);<br> the natural ID must be defined at the root of an entity hierarchy.<br> A general solution would need to support:</p> <p style="margin: 10px 0 0">caching entities by multiple foreign keys (one for each one-to-one association);<br> allow caching entities by foreign keys that are defined in the root of the entity hierarchy, as well as in subclasses.<br> Something to keep in mind is that caching by IDs performs well because an entity's ID is immutable. One-to-one associations based on a foreign key is mutable, and there will be a cost in performance to deal with associations that change. There should be a way to avoid checking for changes when the application "knows" there are no changes, similar to what is described for natural IDs. See SimpleNaturalIdLoadAccess#setSynchronizationEnabled.</p> <p style="margin: 10px 0 0">I have tentatively set the fix version for <span class="jira-issue-macro" data-jira-key="HHH-11124"> <a href="https://hibernate.atlassian.net/browse/HHH-11124" class="jira-issue-macro-key issue-link" title="OneToOne level 2 caching limitation" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12150&avatarType=issuetype"> HHH-11124 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Open</span> </span> to 6.0.Beta1. We will need to investigate further if this is really feasible.</p> </td>
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