Unsuccessful: alter table XXX drop constraint YYY in Hibernate/JPA/HSQLDB standalone

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You can ignore these errors. Combination of create-drop and empty (which is the case always for in-memory) database produces these for every database object it tries to drop. Reason being that there is not any database objects to remove – DROP statements are executed against empty database.

Also with normal permanent database such a errors do come, because Hibernate does not figure out before executing DROP statements does added object exist in database or is it new.

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