Problema con java

Hola, yo soy nuevo en java y tengo un problema con un codigo con conecion a mysql el cual me da el siguiente error :

C:\conectorJDBC>java DBDemo>problema.txt
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 's'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.Util.getInstance(Util.java:384)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1054)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3562)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3494)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:920)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4000)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1285)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2186)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:787)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:49)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:357)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at DBDemo.main(DBDemo.java:22)

este error me da cuando quiero ejecutar el siguiente codigo;
import java.sql.*;

import java.util.Properties;



public class DBDemo{

private static final String dbClassName="com.mysql.jdbc.Driver";



private static final String conn="jdbc:mysql://127.0.0.1/demo";



public static void main (String[]args) throws ClassNotFoundException,

SQLException,InstantiationException,IllegalAccessException{

System.out.println ("Clase dle conector: " +dbClassName);





Class.forName(dbClassName).newInstance();



Properties p=new Properties();

p.put("user","root");

p.put("password","nicolas1204");

System.out.println ("holas\n\n\n" );



try{

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

System.out.println("Funciona");

c.close();

}catch (Exception e){

e.printStackTrace();

System.out.println("Mal");

}

}

}


si me dieran una manito se los agrecedia mucho