Reproduce com.mysql.jdbc.exceptions.jdbc4.CommunicationsException with a setup of Spring, hibernate and C3P0

Question

I got this error from the production code:

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server

Answer 1

To reproduce your error, set your connection timeout in your MySQL properties to a very low value, ie 2 ms, and run a query known to have a long processing time. You can set the timeout property either in the MySQL connection string or via a property if you're using properties files to setup your JDBC connection. You can look up the Javadocs on your specific jaxax.sql.DataSource connection and the MySQL docs for the specifics on how to do this.