Java.sql.SQLException: Communication failure during handshake.

Question

I'm troubled by this problem followed:
the exception is decripted as:
java.sql.SQLException: Communication failure during handshake. Message from server: "Unknown database 'cust'"
I'm using JSP to access the MYSQL database. the database server has three databases:mysql,test,customer. my OS is win98. I can access the customer using "mysql -u root -p customer" in the command prompt.
but when I runs the JSP, the error appears.
the connection string is :
private String protocol = "jdbc:mysql://localhost/customer?user=customer_f&password=151276&useUnicode=true&characterEncoding=8859_1";
if the connection string is :
private String protocol = "jdbc:mysql://localhost/test?user=customer_f&password=151276&useUnicode=true&characterEncoding=8859_1";
or
private String protocol = "jdbc:mysql://localhost/mysql?user=customer_f&password=151276&useUnicode=true&characterEncoding=8859_1";
there's no problem.
what is wrong ?
I guess it's wrong with mysql's setting.
please help me,lots of thks.

Answer 1

It seems user root is the owner of 'customer' database. Can you use root to access 'customer' from JSP code?
Another hint:
Do you grant user customer_f privileges to 'customer' database when create 'customer'?
with root access from mysql> prompt:
mysql>grant all privileges on customer.* to customer_f@"localhost" identified by '151276';
Then, user customer_f will have all privileges to access 'customer' either from prompt or JSP page.
about Creating Users and Setting permission in MySQL
see http://www.devarticles.com/content.php?articleId=134