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I'm still getting JDBC timeouts after trying to configure c3p0 following all of the examples I could find. I'm using JPA, Hibernate, Tomcat, MySQL [AWS RDS]. Here's the snippet from persistence.xml: <property name="javax.persistence.jdbc.url" value="jdbc:mysql://url..." /> <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" /> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> <property name="connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider"/> <property name="hibernate.c3p0.acquire_increment" value="4" /> <property name="hibernate.c3p0.idle_test_period" value="3000" /> <property name="hibernate.c3p0.max_size" value="100" /> <property name="hibernate.c3p0.max_statements" value="15" /> <property name="hibernate.c3p0.min_size" value="5" /> <property name="hibernate.c3p0.timeout" value="100" /> And the error log: 09:18:51.776 WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 0, SQLState: 08S01 09:18:51.777 ERROR org.hibernate.util.JDBCExceptionReporter - The last packet successfully received from the server was 38,491,585 milliseconds ago. ...

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