Thread: creating mysql proxy

Hi everybody

I want to read mysql connection info with java. For example I made a server socket with java on port 4444. Then I made a jdbc driver with url "jdbc:mysql://127.0.0.1:4444/mysql". My mysql is running on port 3306.
I wrote something like below in client class:

    Connection c = DriverManager.getConnection(CONNECTION,p);

which CONNECTION is "jdbc:mysql://127.0.0.1:4444/mysql"

and in server I have this:

clientSocket = ss.accept();

the server get the clientSocket but "clientSocket.getInputStream().available()" is 0.
I really don't know how to fix this problem. I have to know which database, client wants to connect and also I don't want to change the client's source code.
I then wrote this in server class, hope this would solve the problem, but it didn't work

Connection c = DriverManager.getConnection(CONNECTION,p);
				    ObjectOutputStream oo=new ObjectOutputStream(clientSocket.getOutputStream());
				    oo.writeObject(c);

Maybe the way I fix the problem is wrong. if it is, please help me how to write a proxy server for my database

Does the client send any data to the server? I recommend posting an SSCCE to demonstrate.

I don't know if SSCCE has a special format or not. But here is the example:
client sends a request for connecting to a database server: for example at localhost:4444
My server runs at localhost:4444. It should get the data client sends and if it is OK, It passes it to the real database server which is running at localhost:3306.
(exactly like firewall for database)
I think client just open a socket and as I said the "clientSocket.getInputStream().available()" is 0. So I don't think it sends anything to server
again maybe the way I used is wrong and I don't know what to do about it.

yes that is exactly what happened. Server is block until the client sends something and it doesn't send anything so the server is block for ever. I don't want this. I want to read the packages that client sends in order to connect to database (something like sniffing). I don't know maybe "DriverManager.getConnection" wants something before it sends anything.
If I shouldn't rely on available method, how can I understand if client sends anything or not?
I will send SSCCE later.