问题
I get the following error message when trying to connect a web app running on EAP6 to MySQL in OpenShift.
javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Communications link failure
How do I fix this?
回答1:
The same issue was discussed at https://community.jboss.org/thread/202318.
The solution is to append "?autoReconnect=true" to the connection URL. You do this in the standalone.xml file, found in the .openshift/config folder in your OpenShift Maven project.
EDIT
This is actually a known bug: https://community.jboss.org/thread/177144. Validating the connection can be used as a workaround.
<validation>
<check-valid-connection-sql>SELECT 1</check-valid-connection-sql>
</validation>
来源：https://stackoverflow.com/questions/11714042/openshift-mysql-communications-link-failure