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<p style="margin: 10px 0 0 0">Same here for MySQL 5.5.40. In the generated SQL only the topmost entity was quoted and its simple class name was used (because it is abstract and have no discriminator value).</p>
<p style="margin: 10px 0 0 0">I tried to remove <tt>@DiscriminatorColumn</tt> and <tt>@DiscriminatorValue</tt> annotations but got even more cryptic exception without actual SQL:</p>
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<pre style="margin: 10px 0 0 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">Caused by: java.lang.IllegalArgumentException: Parameter value [PurchaseTransaction] did not match expected type [java.lang.Integer (n/a)]
at org.hibernate.jpa.spi.BaseQueryImpl.validateBinding(BaseQueryImpl.java:874) ~[BaseQueryImpl.class:4.3.7.Final]
at org.hibernate.jpa.internal.QueryImpl.access$000(QueryImpl.java:80) ~[QueryImpl.class:4.3.7.Final]
at org.hibernate.jpa.internal.QueryImpl$ParameterRegistrationImpl.bindValue(QueryImpl.java:248) ~[QueryImpl$ParameterRegistrationImpl.class:4.3.7.Final]
at org.hibernate.jpa.internal.QueryImpl$JpaPositionalParameterRegistrationImpl.bindValue(QueryImpl.java:337) ~[QueryImpl$JpaPositionalParameterRegistrationImpl.class:4.3.7.Final]
at org.hibernate.jpa.spi.BaseQueryImpl.setParameter(BaseQueryImpl.java:674) ~[BaseQueryImpl.class:4.3.7.Final]
at org.hibernate.jpa.spi.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:198) ~[AbstractQueryImpl.class:4.3.7.Final]
at org.hibernate.jpa.spi.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:49) ~[AbstractQueryImpl.class:4.3.7.Final]
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<p style="margin: 10px 0 0 0">Note that <tt>PurchaseTransaction</tt> is the entity type I am asking for.</p>
<p style="margin: 10px 0 0 0">Now I have to switch to <tt>InheritanceType.SINGLE_TABLE</tt>.</p>
<p style="margin: 10px 0 0 0">Sad that such a basic feature is broken in the Hibernate, the most used JPA implementation.</p>
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