Question

How can I destroy such a thread that perform very long operation?

I need to solve this problem without setting timeouts for SQL query. I know that Thread.destroy() is deprecated.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class Sample {

    public static void main(String[] args) {
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Class.forName("com.mysql.jdbc.Driver");
                    Connection conn = DriverManager
                            .getConnection("jdbc:mysql://localhost:3306/db");
                    conn.createStatement().execute("SELECT * FROM some_table");
                } catch (SQLException e) {
                    e.printStackTrace();
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                }
            }
        });
        t.start();
    }

}

Answer 1

Jon is right, setting timeouts is the correct way to resolve the problem.

However, you could have another thread in the background running as a timer which holds a reference to the thread and fires an interrupt. This is effectively a home-grown timeout though!