Deleting entities is not happening in the right order.
According to documentation: _all entity deletions shall happen in the same order the corresponding objects were deleted using Session.delete()_
When property,
_hibernate.jdbc.batch_size = 20_,
hibernate is using BatchingBatch, which at line 86, decides whether the statements shall be executed or not:
_if ( batchPosition == batchSize ) {...}_
*Given*
FOO and BAR entities
both with InheritanceType.JOINED and
FOO having a ManyToOne relation to BAR
*When*
The following two lines are executed:
entityManager.remove(foo);
entityManager.remove(bar);
*Then*
Hibernate doesn't execute the statement to remove FOO, but later
It does execute the statement to remove BAR
And as a result:
_delete from BAR where id=2_
*throws*
_Referential integrity constraint violation: "FKJFU6P0IRDHEYXGG5UDT0EAJAH: PUBLIC.FOO FOREIGN KEY(BAR_ID) REFERENCES PUBLIC.BAR(ID) (2)";_
Please check the attached test application.
Just run _mvn install_.
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