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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-9638" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-2c2a3512-77eb-498d-a539-8117e19e1de4" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9638" style="color: #3b73af; text-decoration: none">HHH-9638</a>
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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-9638" style="color: #3b73af; text-decoration: none">Query.getResultList() prepended with dereferencing of no-proxy relation, causes violation of reference equiality constraint</a> </span>
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Issue Type:
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Affects Versions:
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4.3.8
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Unassigned
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hibernate-bug.tar.gz
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Components:
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core
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Created:
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02/Mar/2015 05:22 AM
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lazy proxy
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Reporter:
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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"> <a class="user-hover" rel="konsoletyper" id="email_konsoletyper" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=konsoletyper" style="color:#6c797f;; color: #3b73af; text-decoration: none">Alexey Andreev</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Given two entities, A and B, A has a many-to-one lazy reference to B with no-proxy laziness type. First, we get A instance from session, then get its reference to B, then load all Bs from session. After these operations Hibernate can violate reference equality constraint, i.e. there will be two instances of B with the same primary key, one is original B instance, another is a proxy.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">To run the attached</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The reason is in the following code (org.hibernate.loader.Loader, lines 739-750):</p>
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<b>Loader.java</b>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">if</span> ( returnProxies ) {
<span class="code-comment" style="color: #808080">// now get an existing proxy <span class="code-keyword" style="color: #000091; color: #808080">for</span> each row element (<span class="code-keyword" style="color: #000091; color: #808080">if</span> there is one)
</span> <span class="code-keyword" style="color: #000091">for</span> ( <span class="code-object" style="color: #910091">int</span> i = 0; i < entitySpan; i++ ) {
<span class="code-object" style="color: #910091">Object</span> entity = row[i];
<span class="code-object" style="color: #910091">Object</span> proxy = session.getPersistenceContext().proxyFor( persisters[i], keys[i], entity );
<span class="code-keyword" style="color: #000091">if</span> ( entity != proxy ) {
<span class="code-comment" style="color: #808080">// force the proxy to resolve itself
</span> ( (HibernateProxy) proxy ).getHibernateLazyInitializer().setImplementation(entity);
row[i] = proxy;
}
}
}
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">So, Hibernate returns proxy from Query.getResultList() when there is proxy in session. But this proxy <em>is</em> in session, since <tt>no-proxy</tt> and <tt>proxy</tt> lazy options are implemented the same way, except <tt>no-proxy</tt> also unwraps proxy immediately. So, when we call <tt>a.getB()</tt>, we create proxy for B, but then simply don't use it.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">To reproduce the issue, just build the attached project (<tt>mvn clean package</tt>) and run the built jar file {[java -jar target/hibernate-bug-0.0.1-SNAPSHOT.jar}}.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Despite the Hibernate documentation claims that</p>
<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #ccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This approach requires buildtime bytecode instrumentation and is rarely necessary.</p>
</blockquote>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">this issue is very important. I can't agree with the statement, as when you deal with reach domain model, you always have complex mappings together with lazy loading and inheritance. Regarding persistence ignorance principle, we can't refer directly to Hibernate (or some other ORM) inside our domain, so we have to rely on correct behavior of Hibernate out of the box, without injecting workarounds into domain code. Proxies can't be good solution in this case. Personally, I use no-proxy loading on every lazy relation. Also, take a look at EclipseLink, that does not support lazy loading without bytecode instrumentation.</p>
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