I am trying to connect to DB using the standard JDBC way
connection = DriverManager.getConnection(url, username, password);
Is there a maximum value of timeout on the connection, how long does a connection live, can I increase the value. I want in cases the connection to be open forever , is it a good idea.
You can set the Timeout on the DriverManager like this:
DriverManager.setLoginTimeout(10);
Connection c = DriverManager.getConnection(url, username, password);
Which would imply that if the connection cannot open within the given time that it times out.
In terms of keeping a connection open forever, it is possible if you do not close the connection but it may not be a good idea. Connections should be closed as soon as you are finished with them.
If you want to optimise the opening and closing of connections then you can use a connection pool.