Exception : org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set 2 Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
Hibernate uses it to delay the execution of write operations as long as possible. That provides multiple performance benefits, e.g., Hibernate executes 1 SQL UPDATE statement before committing the database transaction instead of executing an UPDATE statement after every call of a setter method.
I am developing an application with spring and hibernate entityManager. The oracle database is outside the DMZ, running on tomcat 7 . the connection will be interrupted after a period of inactivity by the firewall. I added the ValidationQuery select 1 from dual in context.xml but it does not solve the problem.
ERROR: Access denied for user 'root'@'localhost' (using password: NO) error===>org.hibernate.exception.GenericJDBCException: Could not open connection my Main class File :
You can issue some sort of "keep alive" type of query (ex: SELECT 1) on the connection every so often to keep it alive. This assumes that it got closed because it was idle. You can re-open the connection every so often. If you get a connect closed exception then you can just reopen the connection. Duh.
1 Answer. Sorted by: 2. There is no username provided for the connection. If there is no username password set, then try to set the user as root (default user for mysql). spring.datasource.username=root. Share. Improve this answer. Follow.
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jdbc exception on hibernate data access
