Connecting NetBeans to MySQL [duplicate] - mysql

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This question already has answers here:
Solving a "communications link failure" with JDBC and MySQL [duplicate]
(25 answers)
Closed 7 months ago.
I've looked all over and tried everything I've been able to find on this so I'm making a post in case my issue is something strange.
MySQL workbench can use the server for queries and updates just fine. The notifier shows the server is running.
I've tried using Eclipse Juno and Kepler and got eclipse SQL State: 08S01 error 0. Zero packets were sent successfully and there was no response from the server.
I redownloaded Connector/J to make sure there wasn't an error from a download hiccup. Didn't improve.
I changed to Netbeans to make sure it wasn't just Eclipse and something on my system. No successful packets sent and nothing received.
I tested to make sure the server was on and the correct port was being used by telnet in command prompt and as expected it asks for password input like it should. I used Wire Shark to see what the packet data looked like. It looked like the server was listening on the correct port and MySQL workbench was using the right port.
I'm at a loss for what is wrong. I even updated to Windows 7 to make sure it wasn't a driver authentication issue with Vista.
I used this code in NetBeans:
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MySQLTest {
public static void main(String[] args)
{
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
System.out.println("1");
Connection con = DriverManager.getConnection("jdbc:mysql://127.0.0.0:3306/", "root", "wonderwoman");
System.out.println("2");
con.close();
System.out.println("We made it!");
} catch (SQLException ex) {
Logger.getLogger(MySQLTest.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(MySQLTest.class.getName()).log(Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
Logger.getLogger(MySQLTest.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(MySQLTest.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
And eventually received this:
Oct 22, 2013 8:59:20 PM rad.MySQLTest main
SEVERE: null
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:357)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2482)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2519)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2304)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at rad.MySQLTest.main(MySQLTest.java:21)
Caused by: java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:241)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:307)
... 15 more
What else should I try? It looks like it's getting to the server and than everything is just bouncing off. I've turned off my firewall, I'm not using a proxy, kind of pulling my hair out here.

Answer 1

I think you are running mysql on your local machine if so append your database name to the connection string and try
e.g. "jdbc:mysql://127.0.0.1:3306/databasename"
or try "jdbc:mysql://localhost:3306/databasename"
You are using 127.0.0.0 as your ip address but normally localhost is 127.0.0.1 not 127.0.0.0

Answer 2

Add the MySql_connetor.bin file to your project Library, then clean and build, and run.

Answer 3

I just do a quick search and see this video tutorial, maybe you do something wrong in step by step. Hope it 's helpful for your need http://magentoexpertforum.com/showthread.php/10268-Connect-Netbean-to-MySQL

Answer 4

Hi I just had the exact same problem, up until now my MySQL server was being connected to netbeans fine, then all of a sudden it stopped working. I checked my my.config file in the bin folder and for some reason the port had changed from 3306 to 6033, so you can either re-register your MySQL with the new port number, or change the port number in the config file.

Answer 5

Try this code :
try {
Class.forName("java.sql.Driver");
Connection con =
DriverManager.getConnection("jdbc:mysql://localhost/db_name","username","password");
Statement stmt = con.createStatement();
///your furthercode acc. to your project
}
catch(Exception e) {
JOptionPane.showMessageDialog(null,e.getMessage());
}