java - MySQL & NetBeans problems -

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im doing faculty homeworks , have problem 1 i'm suppoused run tapestry application nb , input values , values should in db , print in table on other page. installed mysql server , run nb aplication still gives me response

"an unexpected application exception has occurred.

error invoking service builder method org.apache.tapestry5.hibernate.hibernatemodule.buildhibernatesessionmanager(hibernatesessionsource, perthreadmanager) (at hibernatemodule.java:87) (for service 'hibernatesessionmanager'): cannot open connection"

if know whats problem please feel free share... in advance..

probably, connection mysql database not stablished, try in configuration file , sure mysql user/password , mysql permissions user. try re-connect.


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