I'm using Google App Engine + Google Cloud SQL + Spring Data JPA in my application.
The following error message often appears. *com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure* *The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.* I know that because of DB connection pool. However, it is difficult to solve because of GAE restrictions. I'm using Common DBCP 1.4 I would like to use Evictor Option. but, thread creation behavior is restricted from GAE. Reluctantly it was forced to use the testOnBorrow + validationQuery options. testOnBorrow : true (default value is false) validationQuery : SELECT 1 I thought I had solved this problem. But it still happens. Please somebody tell me that how to avoid above error message and testOnBorrow option how much reduction in performance. Help me. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/fb3197ae-d01d-4800-b2d7-bcc1890ade96%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
