How to free java memory in a thread

I am working on a Java application, it must transfer information from one database to another in a certain time interval. Currently works with an infinite cycle within a thread, because the user needs to open the application and it does not stop working all day. It happens that while it is running, the application accumulates a lot of memory, after which the message appears

[java.lang.OutOfMemoryError]

If I'm not mistaken, the memory is released when the cycle ends, but in this case it's infinite, what can be done?

Here is the class

package Model;

import Control.Controller;
import static java.lang.Thread.sleep;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Ciclo implements Runnable {

Controller myController;
private boolean iterar;
private String web_service;
private String token;
private String pc;
private int segundos = 10000;

public void setSegundos(int segundos){
    this.segundos = segundos;
}

@Override
public void run() {
    int i = 0;
    while (iterar) {
        try {


            if (!myController.getConexionWebService(web_service, token, pc)){
            } else if (!myController.getConexionMysql()){
            } else if (!myController.getJsonFileExist()){
            }else{

                myController.proceso1();

            }

            if (!myController.getConexionWebService(web_service, token, pc)){
            } else if (!myController.getConexionMysql()){
            } else if (!myController.getJsonFileExist()){
            }else{

                myController.proceso2();

            }
            sleep(segundos);
        } catch (Exception ex) {
            Logger.getLogger(Ciclo.class.getName()).log(Level.SEVERE, null, ex);
            myController.setWriteError(ex.getMessage());
        }
    }

    myController.setReanudarTrue();
    return;
}

public void setController(Controller myController) {
    this.myController = myController;
}

public void iniciar(String web_service, String token, String pc) {
    this.web_service = web_service;
    this.token = token;
    this.pc = pc;
    iterar = true;
    new Thread(this).start();
}

public void pausar() {
    iterar = false;
}

public void reanudar() {
    iterar = true;
    new Thread(this).start();
}



}