Hi,

What version of Jackrabbit do you use? What persistence manager do you
use? I suggest to use a bundle persistence manager. It also reconnects
automatically. See also
http://wiki.apache.org/jackrabbit/PersistenceManagerFAQ

>  The errors we get are very non-descript, like
> "unknown ndbcluster error". But it looks like something is closing database
> connections because jackrabbit often loses the db connection and cannot
> reconnect.

What is the full stack trace? I never heard that Jackrabbit 'loses'
the database connection - so far it was always the MySQL JDBC driver
that lost the connection.

Regards,
Thomas

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