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After an upgrade or after new database calls are configured for an on-premise installation, calls to the database from the application server fail and the following error is seen in the application server log:
ERROR org.hibernate.transaction.JDBCTransaction - Could not toggle autocommit
java.sql.SQLException: Connection has already been closed.
The database connection has been abandoned since the query ran more than time specified for removeAbandonedTimeout.
Increase the value of removeAbandonedTimeOut in tomcat-resources.xml so that it is set to the longest running query your application may have.
This article applies to Appian 19.1 and later.
Last Reviewed: August 2020
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