Vaadin Combobox and LazyInitializationException - vaadin

Question

My question maybe simple simple but I don't understand why Vaadin combobox tries to get a colletion of nested entities set in a combobox if I do not call these items of collection.
See this:
#Entity
public class Estado extends AbstractEntity {
private String nome;
private String sigla;
#OneToMany(mappedBy = "estado")
private List<Municipio> municipios;
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
public String getSigla() {
return sigla;
}
public void setSigla(String sigla) {
this.sigla = sigla;
}
public List<Municipio> getMunicipios() {
return municipios;
}
public void setMunicipios(List<Municipio> municipios) {
this.municipios = municipios;
}
private void initCbEstados() {
if (cbEstados.isEmpty()) {
List<Estado> estados = estadoService.findAllEager();
cbEstados.setItems(estados);
}
cbEstados.addValueChangeListener(e -> updateCbMunicipios());
cbEstados.setClearButtonVisible(true);
cbEstados.setItemLabelGenerator(Estado::getNome);
cbEstados.setWidth("50%");
}
private void updateViewToEdit(){
if (isEditMode) {
Estado estado = entity.getEndereco().getEstado();
***//this throws LazyInitializationException***
cbEstados.setValue(estado);
updateCbMunicipios();
}
I do not call at any time estado.getMunicipios. But apparently the behavior of the combobox tries to infer in the municipios released the exception.
Is this expected behavior?
I don't think it should be?

Answer 1

Sory, fisrt post on stack overflow and i was not familiar with the platform and ended not posting the entire code. The error occurred in
cbEstados.addValueChangeListener(e -> updateCbMunicipios());
that during the debug was not visible because it was occurring within the vaadin classes. The problem was solved by searching for the municpios in updateCbMunicpios(); So when FormBase calls beforeEnter(BeforeEnterEvent event) the readBean() set values on cbEstados that fires ValuechangeListener and load the LazeInicializaTionExceptions because Entity comes from the Request Scoope and not Fully filed to set the Value of Municipio in cbMunicipios. And cbMunicipios would be empty firing anhoter error from Vaadin.
public class FornecedorForm extends CadastroFormBaseGenerics<Fornecedor, FornecedorService> {
private static final long serialVersionUID = -5599427454458715210L;
EstadoService estadoService;
#PropertyId("ativo")
private Checkbox ckAtivo;
#PropertyId("razaoSocial")
private TextField txtRazaoSocial;
#PropertyId("nomeFantasia")
private TextField txtNomeFantasia;
#PropertyId("cnpj")
private TextField txtCnpj;
#PropertyId("contato")
private TextField txtContato;
#PropertyId("telefoneContato")
private TextField txtTelContato;
#PropertyId("telefone")
private TextField txtTelefone;
#PropertyId("observacao")
TextArea txtObservacao;
private ComboBox<Estado> cbEstados;
private ComboBox<Municipio> cbMunicipios;
private TextField txtCep;
private TextField txtLogradouro;
private TextField txtNumero;
private TextField txtComplemento;
#PropertyId("emailContato")
EmailField txtEmailContato;
private FormLayout layout;
HorizontalLayout layoutEstado;
public FornecedorForm(#Autowired EstadoService estadoService) {
super(Fornecedor.class, "Fornecedor");
this.estadoService = estadoService;
updateViewToEdit();
}
protected void configureAdditionalBinds() {
getBinder().bind(cbEstados, "endereco.estado");
getBinder().bind(cbMunicipios, "endereco.municipio");
getBinder().bind(txtCep, "endereco.cep");
getBinder().bind(txtLogradouro, "endereco.logradouro");
getBinder().bind(txtNumero, "endereco.numero");
getBinder().bind(txtComplemento, "endereco.complemento");
}
private void initCbEstados() {
cbEstados = new ComboBox<Estado>("Estado");
List<Estado> estados = estadoService.findAllEager();
cbEstados.setItems(estados);
cbEstados.addValueChangeListener(e -> updateCbMunicipios());
cbEstados.setClearButtonVisible(true);
cbEstados.setItemLabelGenerator(Estado::getNome);
cbEstados.setWidth("50%");
}
private void initCbMunicpios() {
cbMunicipios = new ComboBox<Municipio>("Município");
cbMunicipios.setItemLabelGenerator(Municipio::getNome);
cbMunicipios.setWidth("50%");
cbMunicipios.setReadOnly(true);
}
private void updateCbMunicipios() {
if (cbEstados.getValue() != null) {
cbMunicipios.clear();
cbMunicipios.setReadOnly(false);
Estado estado = estadoService.findMunicipios(cbEstados.getValue());
cbMunicipios.setItems(estado.getMunicipios());
} else {
cbMunicipios.clear();
cbMunicipios.setReadOnly(true);
}
}
#Override
protected void initViewComponents() {
layoutEstado = new HorizontalLayout();
layout = new FormLayout();
layoutEstado.setSizeFull();
initCbEstados();
initCbMunicpios();
ckAtivo = new Checkbox("Ativo ?", true);
txtRazaoSocial = new TextField("Razão Social");
txtNomeFantasia = new TextField("Nome Fantasia");
txtCnpj = new TextField("CNPJ");
txtCnpj.setWidth("25%");
// txtCnpj.setErrorMessage("CNPJ Incorreto.");
// txtCnpj.setPattern("^[0-9]{2}?[-s.]?[0-9]{3}[-s.]?[0-9]{3}[-s/]?[0-9]{4}[-s-]?[0-9]{2}$");
txtTelefone = new TextField("Telefone");
txtContato = new TextField("Nome Contato");
txtTelContato = new TextField("Telefone Contato");
txtEmailContato = new EmailField("Email Contato");
txtEmailContato.setClearButtonVisible(true);
txtEmailContato.setErrorMessage("Formato do E-mail incorreto");
txtEmailContato.setRequiredIndicatorVisible(false);
txtLogradouro = new TextField("Logradouro");
txtNumero = new TextField("Número");
txtNumero.setWidth("50px");
txtCep = new TextField("CEP");
txtCep.setPattern("^[0-9]{5}?[-s-]?[0-9]{3}$");
txtCep.setPlaceholder("00000-000");
txtCep.setRequired(true);
txtCep.setErrorMessage("Informe o CEP");
txtCep.setWidth("75px");
txtComplemento = new TextField("Complemento");
txtObservacao = new TextArea("Observações");
layout.add(ckAtivo, 2);
layout.add(txtCnpj, 2);
layout.add(txtRazaoSocial, txtNomeFantasia);
layout.add(layoutEstado, 2);
layout.add(txtLogradouro, txtNumero);
layout.add(txtComplemento, txtCep, txtTelefone);
HorizontalLayout layoutContato = new HorizontalLayout(txtContato, txtTelContato, txtEmailContato);
layoutContato.setSizeFull();
txtContato.setWidth("40%");
txtEmailContato.setWidth("40%");
txtTelContato.setWidth("20%");
layout.add(layoutContato, 2);
layout.add(txtObservacao, 2);
super.formLayout.add(layout);
layoutEstado.add(cbEstados, cbMunicipios);
configureAdditionalBinds();
}
protected void updateViewToEdit() {
if (isEditMode) {
Estado estado = entity.getEndereco().getEstado();
estado = estadoService.findMunicipios(estado);
cbEstados.setValue(estado);
}
}
#Override
protected void getNewEntityToPersist() {
entity = new Fornecedor();
entity.setEndereco(new Endereco());
ckAtivo.setValue(true);
}
}
public abstract class CadastroFormBaseGenerics<T, SERVICE extends ServiceInterface<T>> extends FormLayout
implements BeforeEnterObserver {
private static final long serialVersionUID = 7069232922824142288L;
protected T entity;
#Autowired
private SERVICE service;
private final Class<T> beanClass;
private Binder<T> binder;
private String nomeDoBean;
protected boolean isEditMode;
private Button btnSave = new Button("Salvar");
private Button btnDelete = new Button("Excluir");
private Button btnCancel = new Button("Cancelar");
protected VerticalLayout formLayout = new VerticalLayout();;
private HorizontalLayout buttonsLayout = new HorizontalLayout();
public CadastroFormBaseGenerics(Class<T> beanClass, String nomeDoBean) {
this.beanClass = beanClass;
this.nomeDoBean = nomeDoBean;
}
protected abstract void initViewComponents();
#PostConstruct
private void inicialize() {
checkEditMode();
initBinder();
initViewComponents();
addComponentAsFirst(formLayout);
configureFormLayout();
getEntityToEdit();
updateViewToEdit();
}
protected abstract void updateViewToEdit();
protected void initBinder() {
binder = new BeanValidationBinder<T>(beanClass);
}
protected void setPlaceHolders(String beanName) {
String primeiraLetra = "" + beanName.charAt(0);
primeiraLetra = primeiraLetra.toUpperCase();
char letraMaiuscula = primeiraLetra.charAt(0);
char[] cArray = beanName.toCharArray();
cArray[0] = letraMaiuscula;
beanName = new String(cArray);
for (int i = 0; i < formLayout.getComponentCount(); i++) {
Component c = formLayout.getComponentAt(i);
if (c.getClass().getName().equals("com.vaadin.flow.component.textfield.TextField")) {
TextField aux = (TextField) c;
aux.setPlaceholder(aux.getLabel() + " " + beanName + "...");
aux.setClearButtonVisible(true);
}
}
}
protected void configureFormLayout() {
formLayout.setSizeFull();
// formLayout.setMargin(true);
formLayout.setSpacing(true);
formLayout.setPadding(true);
formLayout.setAlignItems(Alignment.AUTO);
formLayout.setMargin(true);
// add(formLayout, 2);
configureButtonsLayout();
}
void configureButtonsLayout() {
btnDelete.setVisible(false);
btnSave.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
btnDelete.addThemeVariants(ButtonVariant.LUMO_ERROR);
buttonsLayout = new HorizontalLayout();
buttonsLayout.add(btnSave, btnDelete, btnCancel);
buttonsLayout.setMargin(true);
buttonsLayout.setPadding(true);
buttonsLayout.setSizeFull();
configureButtonEvents();
add(buttonsLayout, 2);
}
private void configureButtonEvents() {
btnSave.addClickListener(saveEvent -> save());
btnDelete.addClickListener(deleteEvent -> delete());
btnCancel.addClickListener(cancelEvent -> clearForm());
}
private void save() {
String msg = nomeDoBean + " Alterada(o) com sucesso.";
if (!isEditMode) {
msg = nomeDoBean + " Cadastrada(o) com sucesso.";
getNewEntityToPersist();
// getNewEntity();
}
try {
getBinder().writeBean(entity);
service.save(entity);
clearForm();
showSucess(msg);
} catch (DoisCsCrudException e) {
showWarnig(nomeDoBean + " já cadastrado. Verique.");
logException(e, "Metodo save()");
} catch (ValidationException e) {
showWarnig("Verique os campos obrigatórios.");
}
}
/**
* {#summary} Você deve implementar o {#code} entity = New POJO este método é
* chamado toda vez que {#code} save() para criar um novo BEAN a ser persistido.
*/
protected abstract void getNewEntityToPersist();
private void delete() {
try {
service.delete(entity);
clearForm();
showSucess(nomeDoBean + " removida(o) com sucesso.");
} catch (DoisCsCrudException e) {
showWarnig(nomeDoBean + " não pode ser removida(o), pois existem registros que dependem dele. %/n "
+ "Inative-o para que não seja mais exibido.");
}
}
#SuppressWarnings("unchecked")
private void getEntityToEdit() throws ClassCastException {
if (isEditMode) {
btnDelete.setVisible(true);
this.entity = (T) VaadinServletRequest.getCurrent().getAttribute("entityToEdit");
}
}
private boolean checkEditMode() {
if (VaadinServletRequest.getCurrent().getAttribute("entityToEdit") != null) {
isEditMode = true;
} else {
isEditMode = false;
}
return isEditMode;
}
/**
* Sempre deve ser chamado após um click no botão salvar, cancelar ou excluir
*/
protected void clearForm() {
// Desabilita o botão para excluir um Bean Cadastrado
btnDelete.setVisible(false);
// Seta editmode para falso, garantido que a proxima interação
// seja com um bean novo
isEditMode = false;
clearBinder();
}
protected void clearBinder() {
binder.readBean(null);
}
protected void showSucess(String message) {
createNotification(message, NotificationVariant.LUMO_SUCCESS, 3000);
}
protected void showError(String message) {
createNotification(message, NotificationVariant.LUMO_ERROR, 5000);
}
protected void showWarnig(String message) {
createNotification(message, NotificationVariant.LUMO_CONTRAST, 10000);
}
private void createNotification(String message, NotificationVariant variant, int duration) {
Notification n = new Notification(message);
n.setDuration(7000);
n.addThemeVariants(variant);
n.setPosition(Position.TOP_CENTER);
n.open();
}
protected void logException(Exception e, String logDesc) {
System.out.println("################ " + logDesc.toUpperCase() + " $$ " + getClass().getSimpleName()
+ " ################");
e.printStackTrace();
}
public Binder<T> getBinder() {
return binder;
}
#Override
public void beforeEnter(BeforeEnterEvent event) {
binder.bindInstanceFields(this);
if (entity != null) {
getBinder().readBean(entity);
}
}
}