doubt regarding on com.mysql.jdbc.CommunicationException

hi... iam develped an appln which peridically updates datas into the database iam using MySql server here... it will work normally for sometime.. then it throws the exception com.mysql.jdbc.CommunicationException... but datas are continuously updated into the database... After a few minutes,it dont throw any exception database is continously updated... i need to knw why this exception arise...? and also to knw how to rectify this exception...?can anyone help me regarding this.........

[496 byte] By [83Krisha] at [2007-11-27 6:06:32]