JDBC/MYSQL Connection problems

Question

I'm new to using JDBC so I'm not sure if I'm simply doing something wrong in my code or if I've installed something incorrectly. I've got the JDBC connector/J installed properly as far as I can tell. At least when I run my code I'm not getting an error about the driver not being found. The problem I'm running into is that even though I've double and triple checked the authentication info I keep getting the following error:
Exception in thread "main" java.sql.SQLException: Invalid authorization specification message from server: "Access denied for user: '[email protected]' (Using password: YES)"
The actual connection commands I'm using are as follows:
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost/Test", "testusr", "testpwd");
I've checked and rechecked the spelling of my mySQL user & password and as far as I can tell, they work just fine so I can't figure out why I would be getting this error. Any suggestions on things I can try or does anyone see any obvious errors in what I'm doing?

Answer 1

The failure is caused not by the JDBC driver but by how the MySQL was configured
when it was installed. By default, MySQL is configured to allow connections that
are created only from within the localhost.
The line
DriverManager.getConnection("jdbc:mysql://localhost:3306/Test?user=testusr& password=testpwd") translates to "create a connection to MySQL running at 'localhost' and use the
'testusr@<hostname.domain>' as user name and 'testpwd' as the password".
If you can see, the <hostname.domain> is replaced with "other value" aside from
the "localhost" which you expect, hence connection is denied.
The '<hostname.domain>' is replaced with the value of either your IP address or
hostname. Therefore, any connections created from outside the host where your
server is running will be denied. Now, making the 'host' value set from
'localhost' to '%' would tell MySQL that you are allowing connections created from
outside the MySQL host to connect to the server.
Another way to go around this is problem is to modify your
"\Windows\system32\drivers\etc\hosts" OR "/etc/hosts" file and give
your loopback address (127.0.0.1) another alias (aside from localhost), e.g.:
127.0.0.1    localhost    <hostnameY.domain>
192.168.1.1  <hostnameX.domain>  <hostnameY.domain>where you replace <hostnameY.domain> with the name/alias of your computer in
the network. The domain is optional and depends upon the domain name that
your network is using.