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While I returned to eclipse to test a simple JDBC related program after couple of months, I encountered some kind of error. The error was jdbc.SQLServerException.

Source Code

Let’s have look at source code where Microsoft SQL Server is connected using JDBC.SqlServerDriver.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;

public class TestDB {

	public static void main(String[] args) throws ClassNotFoundException, SQLException {
		// TODO Auto-generated method stub
		Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
		String dburl="jdbc:sqlserver://localhost\\SQLEXPRESS;user=sa;password=password";
		Connection con=DriverManager.getConnection(dburl);
		String sql="Select * from DevelopmentDB.dbo.UserInfo";
		Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
		ResultSet rs=st.executeQuery(sql);
                System.out.println(rs);
		}

Output with jdbc.SQLServerException error

Now while running this program, I got following exception in output console.

Tip: An unwanted and unexpected event during program execution which disrupt the normal flow of execution of program is called Exception.
To learn more about what is exception in Java, please refer to above linked article.

Exception in thread "main" com.microsoft.sqlserver.jdbc.SQLServerException: The connection to the host localhost, named instance sqlexpress failed. Error: "java.net.SocketTimeoutException: Receive timed out". Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434. For SQL Server 2005 or later, verify that the SQL Server Browser Service is running on the host.
 at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:191)
 at com.microsoft.sqlserver.jdbc.SQLServerConnection.getInstancePort(SQLServerConnection.java:5247)
 at com.microsoft.sqlserver.jdbc.SQLServerConnection.primaryPermissionCheck(SQLServerConnection.java:1871)
 at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1608)
 at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1459)
 at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:773)
 at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1168)
 at java.sql.DriverManager.getConnection(Unknown Source)
 at java.sql.DriverManager.getConnection(Unknown Source)
 at TestDB.main(TestDB.java:14)

Error Troubleshooting – Validating the Instance name

Now I do as per the instruction in the error.

1. Server name is fine. localhost or Name of pc is fine for server name. or run this code in SQL Server Management Studio.

   select @@SERVERName

   This code will display name of server

2. Instance name: It is very difficult to find instance name for me. After checking a manual, I find a code to find instance name.

   select @@SERVICENAME

   This code will print name of instance.

After executing these codes, I got – MSSQLSERVER as instance name.

Solution – Change the instance Name

As you can see in the connection string part, String dburl="jdbc:sqlserver://localhost\SQLEXPRESS;, I have mentioned SQLEXPRESS as instance name of localhost server. While as just returned above by codes in SSMS, the name of server was MSSQLSERVER.

I replaced SQLEXPRESS by MSSQLSERVER and my code run fine.

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