java 8 Swing application with oracle 10 g database

Question

I created one Swing project in Java 8 and I used Oracle 10g for database connectivity. Everything is fine but when I run my project then after few operations i am getting following error:

java.sql.SQLException: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
localhost:1521:xe

I have used following query in oracle database :-

alter system set processes=300 scope=spfile;

But it's not working still number of processes is 40:-

RESOURCE_NAME                processes
CURRENT_UTILIZATION          39
MAX_UTILIZATION              40
INITIAL_ALLOCATION           40
LIMIT_VALUE                  40

What should I do?

Hello I am using following code for connection:-

package connection;

import java.sql.*;

public class conn {

Connection con;
Statement st;
ResultSet rs;



public ResultSet GetData(String s) {

    try{

        Class.forName("oracle.jdbc.OracleDriver");
        con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "123456");
        st=con.createStatement();
        //System.out.println("Connected to DataBase to show the result...");
        rs=st.executeQuery(s);

    }

        catch(Exception e)
        {
        System.out.println(e);
                    }
        return rs;

        }



public void UpdateData(String s) {

    try
    {
    Class.forName("oracle.jdbc.OracleDriver");
    con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "system", "123456");
    st=con.createStatement();
    //System.out.println("Connected to the DataBase for Updating the Record...");
    st.executeUpdate(s);
    System.out.println("Record Updated...");


    }

    catch(Exception e1)
    {
    System.out.println(e1); 
    }


}

}

These codes are in seperate class now when ever i want to use the database connectivity in project i am just creating a object of this class and using a functions. In my project i am using timer as well to refresh data of JTable. Please kindly provide solution ?

Answer 1

Its Resolved now. Thank You so much to all for your support. It was happening because i didn't close connection in database connectivity class which i have mentioned in my question and codes. every time when timer start then it creates new instance of database connectivity class without closing old one. Now i created close method in the connection class and every thing is fine.