Hibernate, C3P0, Mysql — Broken Pipe

Question

MySQL seems to have an 8 hour time out on its connections. I\'m running multiple WARs in Tomcat utilizing Hibernate for ORM. After 8 hours (i.e. overnight), I get broken pip

Answer 1

I was getting the same problem and it took time to figure out the solution.

I use Hibernate 4.0.1 and mysql 5.1(no spring framework) and I was facing the issue. First make sure that you configured the c3p0 jars properly which are essential.

I used these properties in hibernate.cfg.xml

true
org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider
5
20
50
SELECT 1;
true
10
5
200
40

But it's of no use 'cause C3p0 was still taking the default properties not the properties which I set in hibernate.cfg.xml, You can check it in logs. So, I searched many websites for right solution and finally I came up with this. remove the C3p0 properties in cfg.xml and create c3p0-config.xml in the root path(along with cfg.xml) and set properties as follows.

 
con_test
40 
10 
10
20 
5 
50
SELECT 1;
5
200
30

but if you run, ORM takes the jdbc connection but not C3p0 connection pool 'cause we should add these properties in hibernate.cfg.xml

true

org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider

now everything works fine(At least it worked fine for me) and the issue is solved.

check the following for references.

http://www.mchange.com/projects/c3p0/index.html#configuring_connection_testing

https://community.jboss.org/wiki/HowToConfigureTheC3P0ConnectionPool

I hope this solves your problem.