package com.nameless.bank.web.forms;

import java.util.Collection;

/**
 * Created by  on 05.04.2016.
 */
public class MainFrameForm {
    private Collection clients;

    public Collection getClients() {
        return clients;
    }

    public void setClients(Collection clients) {
        this.clients = clients;
    }
}

package com.nameless.bank.web.forms;

import java.util.Collection;

/**
 * Created by Глеб on 05.04.2016.
 */
public class MainFrameForm {
    private Collection clients;

    public Collection getClients() {
        return clients;
    }

    public void setClients(Collection clients) {
        this.clients = clients;
    }
}

Update MainFrameForm.java