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    Check if you're not creating unused SQL entities, as it might cause this exception.

Solutions on the web

via GitHub by Sami32
, 2 weeks ago
Database is already closed (to disable automatic closing at VM shutdown, add ";DB_CLOSE_ON_EXIT=FALSE" to the db URL) [90121-196]
via Stack Overflow by Buns of Aluminum
, 2 years ago
Database is already closed (to disable automatic closing at VM shutdown, add ";DB_CLOSE_ON_EXIT=FALSE" to the db URL) [90121-170]
via ha-jdbc by justincranford
, 2 years ago
This method is not allowed for a prepared statement; use a regular statement instead. [90130-175]
via Stack Overflow by user1432980
, 1 year ago
The object is already closed [90007-170]
via Stack Overflow by Unknown author, 2 years ago
Database is already closed (to disable automatic closing at VM shutdown, add ";DB_CLOSE_ON_EXIT=FALSE" to the db URL) [90121-140]
Empty query.