Suddenly mysql gave this error ???

[Mufaddal Khumri]

Everything was working fine. No changes were made and suddenly this  
error shows up:

java.sql.SQLException: Server configuration denies access to data source
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:386)
	at com.mysql.jdbc.Connection.createNewIO(Connection.java:1486)
	at com.mysql.jdbc.Connection.<init>(Connection.java:474)
	at com.mysql.jdbc.Driver.connect(Driver.java:413)
	at java.sql.DriverManager.getConnection(DriverManager.java:512)
	at java.sql.DriverManager.getConnection(DriverManager.java:193)
	at  
com.wavesinmotion.cw.classes.db.ConnectionPool.<init>(ConnectionPool.jav 
a:51)

Does anybody know why ?

Thanks