java.io.EOFException,SSH port forwarding - mysql

Question

package com.soul.db;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import java.sql.Connection;
public class JdbcSSHConnection {
/**
* Java Program to connect to remote database through SSH using port forwarding
* #throws SQLException
*/
public static void main(String[] args) throws SQLException {
int lport=443;
String rhost="10.99.69.10";
String host="10.105.27.201";
int rport=3306;
String user="root";
String password="SysPassword1";
String dbuserName = "root";
String dbpassword = "DBPassword1";
String url = "jdbc:mysql://localhost:"+lport+"/proj_db";//"jdbc:mysql://localhost:3306", "root", "mysql"
String driverName="com.mysql.jdbc.Driver";
Connection conn = null;
Session session= null;
try{
//Set StrictHostKeyChecking property to no to avoid UnknownHostKey issue
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
JSch jsch = new JSch();
session=jsch.getSession(user, host, 22);
session.setPassword(password);
session.setConfig(config);
session.connect();
System.out.println("Connected");
int assinged_port=session.setPortForwardingL(lport,rhost, rport);
System.out.println("localhost:"+assinged_port+" -> "+rhost+":"+rport);
System.out.println("Port Forwarded");
//mysql database connectivity
Class.forName(driverName).newInstance();
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection (url, "root", "DBPassword1");
// step3 create the statement object
Statement stmt = conn.createStatement();
System.out.println ("Database connection established");
// step4 execute query
ResultSet rs = stmt.executeQuery("select DISTINCT STUD_NAME from STUD_DETAILS;");
while (rs.next())
System.out.println(rs.getString(1));
// step5 close the connection object
conn.close();
//System.out.println ("Database connection established");
// System.out.println("DONE");
}catch(Exception e){
e.printStackTrace();
}finally{
if(conn != null && !conn.isClosed()){
System.out.println("Closing Database Connection");
conn.close();
}
if(session !=null && session.isConnected()){
System.out.println("Closing SSH Connection");
session.disconnect();
}
}
}
}
I installed SSH secure shell client on my windows machine.I am trying to connect mysql server installed in linux machine.
Now i am getting below Error:
Connected
localhost:443 -> 10.99.69.10:3306
Port Forwarded
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
com.mysql.jdbc.CommunicationsException
MESSAGE: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
MESSAGE: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
STACKTRACE:
java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1997)
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:573)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.soul.db.JdbcSSHConnection.main(JdbcSSHConnection.java:54)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
STACKTRACE:
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
MESSAGE: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
STACKTRACE:
java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1997)
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:573)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.soul.db.JdbcSSHConnection.main(JdbcSSHConnection.java:54)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:641)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.soul.db.JdbcSSHConnection.main(JdbcSSHConnection.java:54)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2847)
Closing SSH Connection
at com.mysql.jdbc.Connection.(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.soul.db.JdbcSSHConnection.main(JdbcSSHConnection.java:54)

Answer 1

These errors were resolved for me once I started using the hostname instead of the IP address for the SSH tunnel. I am also connecting to MySQL on Linux via SSH tunnel (with DataGrip IDE).