Keep getting org.hibernate.exception.JDBCConnectionException: could not execute query

Question

I\'ve got a J2EE application which uses JSP pages as front end and Struts2 as controller. I also use Hibernate to map my objects into a MySql DB. when I deploy the application o

Answer 1

Once I get a similary looking exception, when I used a connection pool and the connection was closed after some time, but the pool did not recognized it.

What helped me in this case was to add a validation query to my data source:

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