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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?atlOrigin=eyJpIjoiZmIxNDc0YzAzNmJlNDE5OWI3YjY4ODgwYTM0NjIwOWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-14097?atlOrigin=eyJpIjoiZmIxNDc0YzAzNmJlNDE5OWI3YjY4ODgwYTM0NjIwOWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-1d80b05c-b845-4ee1-bf1c-fcc5d5fbf60f" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-14097?atlOrigin=eyJpIjoiZmIxNDc0YzAzNmJlNDE5OWI3YjY4ODgwYTM0NjIwOWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-14097</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-14097?atlOrigin=eyJpIjoiZmIxNDc0YzAzNmJlNDE5OWI3YjY4ODgwYTM0NjIwOWMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Versions 5.4.11.Final+ produce too many sql 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">Change By:</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="jleloup44" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_jleloup44" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5efca30c61665e0b9edf715c"> Julien Leloup </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"> <span class="diffcontext">Hi,<br><br>From version 5.4.11.Final, more SQL queries than usual</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> may be</span> <span class="diffaddedchars" style="background-color:#ddfade;"> are</span> <span class="diffcontext"> generated, for an unknown reason.<br>Please see the little project I made to try to understand : [https://gitlab.com/julien.leloup/spring-data-jpa-doc|https://gitlab.com/julien.leloup/spring-data-jpa-doc]<br><br>This project is a Spring Data JPA project and uses :<br><br>* spring-boot-starter-parent 2.2.4-RELEASE<br>* H2 database (on a PostgreSQL database the problem is the same)<br>* Hibernate-core 5.4.12.Final<br><br>In this project there are 5 entities with the following relations :<br>A ----- C (1-N)<br>B ----- C (1-N)<br>C ----- D (1-N)<br>D ----- E (N-1)<br>All the relations are bi-directionnal and use a FetchType LAZY<br><br>On Hibernate-core 5.4.10.Final and prior, if I execute the following query :<br><br>{code:java}@EntityGraph(attributePaths = {"a", "b", "dList", "dList.e"})<br>CEntity getById(Integer id);{code}<br><br>it produces only 1 SQL request, which is correct if I understood correctly :<br><br>{code:java}Hibernate: select centity0_.id as id1_2_0_, bentity1_.id as id1_1_1_, dlist2_.id as id1_3_2_, eentity3_.id as id1_4_3_, aentity4_.id as id1_0_4_, centity0_.a_id as a_id3_2_0_, centity0_.b_id as b_id4_2_0_, centity0_.label as label2_2_0_, bentity1_.label as label2_1_1_, dlist2_.c_id as c_id3_3_2_, dlist2_.e_id as e_id4_3_2_, dlist2_.label as label2_3_2_, dlist2_.c_id as c_id3_3_0_, dlist2.id as id1_3_0_, eentity3.label as label2_4_3_, aentity4_.label as label2_0_4_ from c centity0_ left outer join b bentity1_ on centity0_.b_id=bentity1_.id left outer join d dlist2_ on centity0_.id=dlist2_.c_id left outer join e eentity3_ on dlist2_.e_id=eentity3_.id left outer join a aentity4_ on centity0_.a_id=aentity4_.id where centity0_.id=?{code}<br><br>But From version 5.4.11.Final, *the same code* produces 3 requests :<br><br>{code:java}Hibernate: select centity0_.id as id1_2_0_, aentity1_.id as id1_0_1_, bentity2_.id as id1_1_2_, dlist3_.id as id1_3_3_, eentity4_.id as id1_4_4_, centity0_.a_id as a_id3_2_0_, centity0_.b_id as b_id4_2_0_, centity0_.label as label2_2_0_, aentity1_.label as label2_0_1_, bentity2_.label as label2_1_2_, dlist3_.c_id as c_id3_3_3_, dlist3_.e_id as e_id4_3_3_, dlist3_.label as label2_3_3_, dlist3_.c_id as c_id3_3_0_, dlist3.id as id1_3_0_, eentity4.label as label2_4_4_ from c centity0_ left outer join a aentity1_ on centity0_.a_id=aentity1_.id left outer join b bentity2_ on centity0_.b_id=bentity2_.id left outer join d dlist3_ on centity0_.id=dlist3_.c_id left outer join e eentity4_ on dlist3_.e_id=eentity4_.id where centity0_.id=?{code}<br><br>{code:java}Hibernate: select dlist0_.e_id as e_id4_3_0_, dlist0_.id as id1_3_0_, dlist0_.id as id1_3_1_, dlist0_.c_id as c_id3_3_1_, dlist0_.e_id as e_id4_3_1_, dlist0_.label as label2_3_1_ from d dlist0_ where dlist0_.e_id=?{code}<br><br>{code:java}Hibernate: select dlist0_.e_id as e_id4_3_0_, dlist0_.id as id1_3_0_, dlist0_.id as id1_3_1_, dlist0_.c_id as c_id3_3_1_, dlist0_.e_id as e_id4_3_1_, dlist0_.label as label2_3_1_ from d dlist0_ where dlist0_.e_id=?{code}<br><br>Could you please investigate ?<br><br>Note : first I opened the following ticket to Spring Data Jpa team :<br>[https://jira.spring.io/browse/DATAJPA-1747|https://jira.spring.io/browse/DATAJPA-1747]<br>Their answer was "Until demonstrated otherwise, I'll have to assume this is caused by Hibernate."<br><br>Regards</span> </td>
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