У меня проблема с таблицей vaadin. Когда я меняю строку отображаемых значений, возвращает NullPointerException, и я не знаю почему. В таблице vaadin chapter5 Table существует метод setNullSelectionAllowed (false), когда эта проблема возникает, но все же не работает для меня.NullPointerException в таблице vaadin?
// Table configs
Table tabela = new Table();
tabela.setSizeFull();
tabela.addContainerProperty("Aperfeiçoamento", String.class, null);
tabela.addContainerProperty("Entidade", String.class, null);
tabela.addContainerProperty("Início", String.class, null);
tabela.addContainerProperty("Conclusão", String.class, null);
tabela.setNullSelectionAllowed(false);
tabela.setImmediate(true);
tabela.setSelectable(true);
tabela.setColumnReorderingAllowed(false);
tabela.addValueChangeListener(this);
@Override
public void valueChange(ValueChangeEvent event) {
/** preenche os campos do formulario com o id do aperfeicoamento */
String id = event.getProperty().getValue().toString();
List<Aperfeicoamento> lista = new AperfeicoamentoDAO().getAperfeicoamentoById(Integer.parseInt(id));
if(!lista.isEmpty()){
try{
for(Aperfeicoamento apf : lista){
aperfeicoamento.setValue(apf.getAperfeicoamento());
entidadeEnsino.setValue(apf.getEntidadeEnsino());
cidade.setValue(apf.getCidade());
comboEstado.setValue(apf.getEstado());
inicio.setValue(new SimpleDateFormat("dd/MM/yyyy").parse(apf.getInicio()));
conclusao.setValue(!apf.getConclusao().isEmpty() ? new SimpleDateFormat("dd/MM/yyyy").parse(apf.getConclusao()) : null);
}
}catch(ParseException e){
e.printStackTrace();
}
}
}
// DAO
/** retorna uma lista de perfeicoamento por id e cpf */
public List<Aperfeicoamento> getAperfeicoamentoById(Integer id){
List<Aperfeicoamento> lista = new ArrayList<Aperfeicoamento>();
try{
PreparedStatement stm = this.con.prepareStatement("SELECT * FROM aperfeicoamento WHERE idAperfeicoamento = ? AND cpf = ?");
stm.setInt(1, id);
stm.setString(2, SessionCurriculum.getCpfInSession());
ResultSet rs = stm.executeQuery();
if(rs.next()){
Aperfeicoamento apf = new Aperfeicoamento();
apf.setIdAperfeicoamento(rs.getInt("idAperfeicoamento"));
apf.setAperfeicoamento(rs.getString("aperfeicoamento"));
apf.setEntidadeEnsino(rs.getString("entidadeensino"));
apf.setCidade(rs.getString("cidade"));
apf.setEstado(rs.getString("estado"));
apf.setInicio(new ControlaDatas().getDataFormatada(rs.getString("inicio")));
apf.setConclusao(rs.getString("conclusao") == null ? null : new ControlaDatas().getDataFormatada(rs.getString("conclusao")));
lista.add(apf);
}
rs.close();
stm.close();
}catch(SQLException e){
new Notification("Erro tentando select em aperfeiçoamento <br/>", e.getLocalizedMessage(), Notification.Type.ERROR_MESSAGE, true).show(Page.getCurrent());
}
return lista;
}
com.vaadin.event.ListenerMethod$MethodException: Invocation of method valueChange in br.ind.ibg.curriculunsibg.views.CursosViewне удалось. на com.vaadin.event.ListenerMethod.receiveEvent (ListenerMethod.java:528) в com.vaadin.event.EventRouter.fireEvent (EventRouter.java:167) при com.vaadin.server.AbstractClientConnector.fireEvent (AbstractClientConnector. Java: 969) на com.vaadin.ui.AbstractField.fireValueChange (AbstractField.java:1126) в com.vaadin.ui.AbstractField.setValue (AbstractField.java:542) при com.vaadin.ui.AbstractSelect .setValue (AbstractSelect.java:702) на com.vaadin.ui.AbstractSelect.changeVariables (AbstractSelect.java:521) на com.vaadin.ui.Table.changeVariables (Table.java:2880) на com.vaadin .server.communication.ServerRpcHandler.changeVariables (ServerRpcHandler.java:396) на com.vaadin.server.communication.ServerRpcHandler.handleBurst (ServerRpcHandler.java:221) на com.vaadin.server.communication.ServerRpcHandler.handleRpc (ServerRpcHandler.java:111) в com.vaadin.server .communication.UidlRequestHandler.synchronizedHandleRequest (UidlRequestHandler.java:91) на com.vaadin.server.SynchronizedRequestHandler.handleRequest (SynchronizedRequestHandler.java:37) на com.vaadin.server.VaadinService.handleRequest (VaadinService.java:1371) на com.vaadin.server.VaadinServlet.service (VaadinServlet.java:238) at javax.servlet.http.HttpServlet.service (HttpServlet.java:723) по адресу org .apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java:290) на org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206) на org.apache.catalina.core.StandardWrapperValve .invoke (StandardWrapperValve.java:233) на org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java:191) на org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java:127) на org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:103) на org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:109)на org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java:293) на org.apache.coyote.http11.Http11Processor.process (Http11Processor.java:861) в org.apache.coyote .http11.Http11Protocol $ Http11ConnectionHandler.process (Http11Protocol.java:606) at org.apache.tomcat.util.net.JIoEndpoint $ Worker.run (JIoEndpoint.java:489) at java.lang.Thread.run (Thread.java:724) Вызванный: java.lang.NullPointerException на br.ind.ibg.curriculunsibg.views.CursosView.valueChange (CursosView.java:304) на sun.reflect.NativeMethodAccessorImpl.invoke0 (Родной метод) на sun.reflect.NativeM ethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.Java: 43) в java.lang.reflect.Method.invoke (Method.java:606) в com.vaadin.event.ListenerMethod.receiveEvent (ListenerMethod.java:508) ... 27 более
Любая идея?
какая строка вызывает NullPointerException? – wxyz
все причины строк. Исключение NullPointerException происходит, когда я меняю выбор. – FernandoPaiva
покажите нам stacktrace ошибки. Что вы имеете в виду? – wxyz