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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-10488" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-8c14f116-9509-48bd-bdb7-2da7751d9012" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10488" style="color: #3b73af; text-decoration: none">HHH-10488</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-10488" style="color: #3b73af; text-decoration: none">Exception when using the Treat-Operator with MapJoins</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-8c14f116-9509-48bd-bdb7-2da7751d9012" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td> 
                                                </tr> 
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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"> 5.0.7, 4.3.10 </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> 
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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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-treat-test.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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td> 
                                                </tr> 
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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"> 29/Jan/2016 10:27 AM </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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Linux, Java8, HSQLDB &amp; Postgres </td> 
                                                </tr> 
                                                <tr> 
                                                    <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: 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-440af08a-3fae-4e57-a3e1-911d23f7a013" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td> 
                                                </tr> 
                                                <tr> 
                                                    <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="mtf90" id="email_mtf90" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mtf90" style="color:#6c797f;; color: #3b73af; text-decoration: none">M F</a> </td> 
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                                    <td class="email-content-main mobile-expand  issue-description-container" style="padding: 0px; border-collapse: collapse; border-left: 1px solid #cccccc; border-right: 1px solid #cccccc; border-top: 0; border-bottom: 0; padding: 0 15px 0 16px; background-color: #ffffff; padding-top: 5px; padding-bottom: 10px" bgcolor="#ffffff"> 
                                        <table class="text-paragraph-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 2px"> 
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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">I am experiencing some buggy behaviour regarding the TREAT operator on MapJoins. In the following I will only sketch the scenario, for the full detail see the attached maven project.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have an entity</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">
class DBObject {
        <span class="code-keyword" style="color: #000091">private</span> Map&lt;DBKey, DBValue&gt; properties;
}
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">that holds a mapping from keys (entities) to values (also entities). DBValue is an abstract super class for several subclasses that store a specific value, e.g. DBValueWithString or DBValueWithReference (which references other DBObjects).</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I now want to query for objects, that own specific properties with certain values. Therefore I use the following CriteriaQuery:</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">
<span class="code-keyword" style="color: #000091">final</span> CriteriaBuilder builder = em.getCriteriaBuilder();
<span class="code-keyword" style="color: #000091">final</span> CriteriaQuery&lt;DBObject&gt; query = builder.createQuery(DBObject.class);

<span class="code-keyword" style="color: #000091">final</span> Root&lt;DBObject&gt; from = query.from(DBObject.class);
<span class="code-keyword" style="color: #000091">final</span> MapJoin&lt;DBObject, DBKey, DBValue&gt; valueJoin = from.join(DBObject_.properties);

<span class="code-keyword" style="color: #000091">final</span> MapJoin&lt;DBObject, DBKey, DBValueWithString&gt; stringJoin = builder.treat(valueJoin, DBValueWithString.class);
<span class="code-keyword" style="color: #000091">final</span> Predicate predicate1 = builder.and(
        builder.equal(stringJoin.get(DBValueWithString_.key), key1),
        builder.equal(stringJoin.get(DBValueWithString_.value), <span class="code-quote" style="color: #009100">"test"</span>)
);
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This query generates to reasonable JPQL:</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">select
        generatedAlias0
    from
        DBObject as generatedAlias0
    inner join
        generatedAlias0.properties as generatedAlias1
    where
        (
            treat(generatedAlias1 as de.mtf.DBValueWithString).key=:param0
        )
        and (
            treat(generatedAlias1 as de.mtf.DBValueWithString).value=:param1
        )
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The corresponding SQL seems a little off, however it works:</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">select
            dbobject0_.id as id1_1_
        from
            DBObject dbobject0_
        inner join
            DBValue properties1_
                on dbobject0_.id=properties1_.object_id
        inner join
            DBValueWithString properties1_1_
                on properties1_.id=properties1_1_.id
        left outer join
            DBValueWithReference properties1_2_
                on properties1_.id=properties1_2_.id
        where
            properties1_.key_id=?
            and properties1_1_.value=?
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Note the unnecessary join with DBValueWithReference. According to the doc, the TREAT operator should also filter out the non matching subtypes, therefore entities of type DBValueWithReference can be completely ignored at this point.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The problem now arises, when querying for DBValueWithReferences. The JPQL query seems fine once again:</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">select
        generatedAlias0
    from
        DBObject as generatedAlias0
    inner join
        generatedAlias0.properties as generatedAlias1
    where
        (
            treat(generatedAlias1 as de.mtf.DBValueWithReference).key=:param0
        )
        and (
            treat(generatedAlias1 as de.mtf.DBValueWithReference).value=:param1
        )
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">However the translation process to SQL fails with the following error message:</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">java.lang.IllegalArgumentException: Parameter value [de.mtf.DBObject@7bf9b098] did not match expected type [java.lang.String (n/a)]
        at org.hibernate.jpa.spi.BaseQueryImpl.validateBinding(BaseQueryImpl.java:897)
        at org.hibernate.jpa.internal.QueryImpl.access$000(QueryImpl.java:61)
        at org.hibernate.jpa.internal.QueryImpl$ParameterRegistrationImpl.bindValue(QueryImpl.java:235)
        at org.hibernate.jpa.spi.BaseQueryImpl.setParameter(BaseQueryImpl.java:638)
        at org.hibernate.jpa.spi.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:163)
        at org.hibernate.jpa.spi.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:32)
        at org.hibernate.jpa.criteria.compile.CriteriaCompiler$1$1.bind(CriteriaCompiler.java:109)
        at org.hibernate.jpa.criteria.CriteriaQueryImpl$1.buildCompiledQuery(CriteriaQueryImpl.java:369)
        at org.hibernate.jpa.criteria.compile.CriteriaCompiler.compile(CriteriaCompiler.java:130)
        at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:699)
        at de.mtf.TreatTest.testTreat(TreatTest.java:98)
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The problem seems to correlate with the unnecessary join, as the type seems to be inferred solely based on the first join (with DBValueWithString), which is unnecessarily part of the second query.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">It seems, DBValue is joined with every sub class that is encountered in the persistence.xml. If you uncomment the @Entity annotation for DBValueWithBoolean, it will occur in the list of join statements.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Moreover, the order of the joins seems to depend on the order of which the classes are listed in the persistence.xml. If you swap the entries for DBValueWithString and DBValueWithReference, the second query executes just fine, whereas the first query now yields:</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">java.lang.IllegalArgumentException: Parameter value [test] did not match expected type [de.mtf.DBObject (n/a)]
        at org.hibernate.jpa.spi.BaseQueryImpl.validateBinding(BaseQueryImpl.java:897)
        at org.hibernate.jpa.internal.QueryImpl.access$000(QueryImpl.java:61)
        at org.hibernate.jpa.internal.QueryImpl$ParameterRegistrationImpl.bindValue(QueryImpl.java:235)
        at org.hibernate.jpa.spi.BaseQueryImpl.setParameter(BaseQueryImpl.java:638)
        at org.hibernate.jpa.spi.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:163)
        at org.hibernate.jpa.spi.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:32)
        at org.hibernate.jpa.criteria.compile.CriteriaCompiler$1$1.bind(CriteriaCompiler.java:109)
        at org.hibernate.jpa.criteria.CriteriaQueryImpl$1.buildCompiledQuery(CriteriaQueryImpl.java:369)
        at org.hibernate.jpa.criteria.compile.CriteriaCompiler.compile(CriteriaCompiler.java:130)
        at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:699)
        at de.mtf.TreatTest.testTreat(TreatTest.java:96)
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">So is this just a misinterpretation of what the TREAT operator is supposed to do, or is it actually a bug in the SQL generation?</p> </td> 
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