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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-9383" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-5ea3353e-1b32-4b4c-8519-81984ebd4f6d" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9383" style="color: #3b73af; text-decoration: none">HHH-9383</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-9383" style="color: #3b73af; text-decoration: none">Merge and refresh queries fail with stack overflow on particular associations</a> </span>
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Issue Type:
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Affects Versions:
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4.3.6
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Assignee:
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Unassigned
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Attachments:
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hibernatebug.zip
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Components:
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core
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Created:
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08/Sep/2014 15:04 PM
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Environment:
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Hibernate ORM 4.3.6.Final <br /> Derby 10.4 (but it doesnt matter)
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Priority:
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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="steve.ash" id="email_steve.ash" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=steve.ash" style="color:#6c797f;; color: #3b73af; text-decoration: none">Steve Ash</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have a object graph like:</p>
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Parent
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@Id property "id", long, generated
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@OnetoMany Set<Child> property "children"
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Child
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@ManyToOne @Id Parent property "parent"
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@Id String property "qualifier"
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">That is the child's primary key is a compound key that is made up of the PK of the parent + some more qualifying information. Perhaps we can argue about the value of such database schemas, but it doesn't seem completely insane. It's certainly legal.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This works fine for most things: load, query with Parent p join fetch p.children. But if you try and use it in a merge or refresh query – you get a stack overflow. Making it worse if the parent happens to have at least one other another association whose property name is alphabetically lower than the "children" property above – then everything works. Thus this bug is easily masked but blows up spectacularly when uncovered (as it did on our project).</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I dug around a little bit and it has something to do with the CascadeEntityJoinWalker – when it is used to build the merge and update queries (AbstractEntityPersister#createLoaders) it adds at most one association as a left join. If that one happens to have an id that has a compound property with a parent's type – then it "loops" trying to forceLoad the parent, which then of course notices the left join to the child (Loader#extractKeysFromResultSet). </p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I am attaching a zip of a self contained maven project with a single unit test containing testMerge which is failing if you want to replicate the problem.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This snippet of the stack trace (which is repeated until stack overflow) kind of shows the path of the problem:</p>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:275)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)<br /> at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070)<br /> at org.hibernate.internal.SessionImpl.internalLoad(SessionImpl.java:989)<br /> at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:716)<br /> at org.hibernate.type.EntityType.resolve(EntityType.java:502)<br /> at org.hibernate.type.ComponentType.resolve(ComponentType.java:666)<br /> at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:838)<br /> at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:720)<br /> at org.hibernate.loader.Loader.processResultSet(Loader.java:952)<br /> at org.hibernate.loader.Loader.doQuery(Loader.java:920)<br /> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)<br /> at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:324)<br /> at org.hibernate.loader.Loader.loadEntity(Loader.java:2148)<br /> at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:78)<br /> at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:68)<br /> at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4126)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:503)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:468)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:275)<br /> at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)<br /> at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070)</p>
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