Update Mysql Java Problem | Error: Exception in thread "AWT-Eventqueue-0" java.lang.Nullpointerexception

Question

Hello, I am Java developer, I am developing a program with mysql and java swing.

And in my update code, is showing the following error: Exception in thread "AWT-Eventqueue-0" java.lang.Nullpointerexception

public boolean updateClient(Client client){
        
        String sql = "update client set name = ?, lastName = ?, email = ?, birthDate = ? where `user` = ?";
        return updateGeneric(sql, client.getName(), client.getLastName(), client.getEmail(), client.getBirthDate(), client.getUser());
        
    } 

The error is happening in the code below, but even so it is updating the correct data, but is showing the error.

   public boolean updateGeneric(String update, Object... paramentos){
    
        try {
        
            PreparedStatement pStatement = connection.prepareStatement(update);
           
            for(int i = 0; i < paramentos.length; i ++){
                pStatement.setObject(i+1, paramentos[i]);
            }
            
            pStatement.executeUpdate();
            ResultSet rSet = pStatement.getResultSet();
            return rSet.next();
        
        } catch (SQLException ex) {
            Logger.getLogger(GenericDAO.class.getName()).log(Level.SEVERE, null, ex);
        }
        
        return false;
    }

Error shown:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at com.infinitycorp.model.DAO.GenericDAO.updateGeneric(GenericDAO.java:95)
    at com.infinitycorp.model.DAO.ClientDAO.updateClient(ClientDAO.java:50)
    at com.infinitycorp.model.service.ClientService.updateSucess(ClientService.java:25)
    at com.infinitycorp.controller.TelaInicialController.updateDataSystem(TelaInicialController.java:29)
    at com.infinitycorp.view.TelaInicial.btnSalvarActionPerformed(TelaInicial.java:1555)
    at com.infinitycorp.view.TelaInicial.access$500(TelaInicial.java:25)
    at com.infinitycorp.view.TelaInicial$7.actionPerformed(TelaInicial.java:906)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.Component.processMouseEvent(Component.java:6533)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
    at java.awt.Component.processEvent(Component.java:6298)
    at java.awt.Container.processEvent(Container.java:2236)
    at java.awt.Component.dispatchEventImpl(Component.java:4889)
    at java.awt.Container.dispatchEventImpl(Container.java:2294)
    at java.awt.Component.dispatchEvent(Component.java:4711)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
    at java.awt.Container.dispatchEventImpl(Container.java:2280)
    at java.awt.Window.dispatchEventImpl(Window.java:2746)
    at java.awt.Component.dispatchEvent(Component.java:4711)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.awt.EventQueue$4.run(EventQueue.java:731)
    at java.awt.EventQueue$4.run(EventQueue.java:729)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)