Vaadin: Datepicker

Diskutiere Vaadin: Datepicker im Web Tier Bereich.
L

lusitano

Moin
Ich versuche mich gerade an Vaadin und wollte damit eine Form erstellen.
Sobald ich in die meine Form Klasse einen Datepicker
Code:
DatePicker datePicker = new DatePicker();
erstelle bekomme ich eine Exception.
Erstelle ich den Datepicker in der Main bekomme ich aber keine Exception.

Was übersehe ich hier ?
Grüße und danke.

Form Klasse
Code:
import com.vaadin.flow.component.combobox.ComboBox;
import com.vaadin.flow.component.datepicker.DatePicker;
import com.vaadin.flow.component.formlayout.FormLayout;
import com.vaadin.flow.component.textfield.TextField;
import com.vaadin.flow.component.timepicker.TimePicker;
import de.laprison.vaadin.uicomponents.fields.ComboBoxes;
import de.laprison.vaadin.uicomponents.fields.DateTimePickers;
import de.laprison.vaadin.uicomponents.fields.TextFields;
import org.springframework.stereotype.Service;



@Service
public class ReferenceForm extends FormLayout {

    private final ComboBoxes comboBoxes;
    private final TextFields textFields;
    private final DateTimePickers dateTimePickers;

    ComboBox<String> cobo = new ComboBox<>();
    TextField tfChargeNr = new TextField();
    TimePicker timePicker = new TimePicker();
    DatePicker datePicker = new DatePicker();

    public ReferenceForm() {

        addClassName("reference-view");
        setSizeFull();
        comboBoxes = new ComboBoxes();
        textFields = new TextFields();
        dateTimePickers = new DateTimePickers();

        add(
                configCobo(),
                configChargeNr(),
                configTimePicker()
        );
    }
Exception

Code:
2020-07-10 09:20:47.650  INFO 6032 --- [  restartedMain] dev-webpack                              : Started webpack-dev-server. Time: 397487874ms
Vaadin application has been deployed and started to the context path "/".
2020-07-10 09:20:47.743  WARN 6032 --- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'referenceForm' defined in file [D:\intellij-projects\testProjects\vaadin-testui\target\classes\de\laprison\vaadin\reference\ReferenceForm.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [de.laprison.vaadin.reference.ReferenceForm]: Constructor threw exception; nested exception is java.lang.NullPointerException
2020-07-10 09:20:47.746  INFO 6032 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2020-07-10 09:20:47.751  WARN 6032 --- [  restartedMain] o.a.c.loader.WebappClassLoaderBase       : The web application [ROOT] appears to have started a thread named [Thread-4] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.base@12.0.1/java.net.PlainSocketImpl.accept0(Native Method)
 java.base@12.0.1/java.net.PlainSocketImpl.socketAccept(PlainSocketImpl.java:159)
 java.base@12.0.1/java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:458)
 java.base@12.0.1/java.net.ServerSocket.implAccept(ServerSocket.java:556)
 java.base@12.0.1/java.net.ServerSocket.accept(ServerSocket.java:524)
 app//com.vaadin.flow.server.DevServerWatchDog$WatchDogServer.run(DevServerWatchDog.java:58)
 java.base@12.0.1/java.lang.Thread.run(Thread.java:835)
2020-07-10 09:20:47.751  WARN 6032 --- [  restartedMain] o.a.c.loader.WebappClassLoaderBase       : The web application [ROOT] appears to have started a thread named [webpack] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.base@12.0.1/java.io.FileInputStream.readBytes(Native Method)
 java.base@12.0.1/java.io.FileInputStream.read(FileInputStream.java:273)
 java.base@12.0.1/java.io.BufferedInputStream.read1(BufferedInputStream.java:290)
 java.base@12.0.1/java.io.BufferedInputStream.read(BufferedInputStream.java:351)
 java.base@12.0.1/sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
 java.base@12.0.1/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
 java.base@12.0.1/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
 java.base@12.0.1/java.io.InputStreamReader.read(InputStreamReader.java:185)
 java.base@12.0.1/java.io.BufferedReader.fill(BufferedReader.java:161)
 java.base@12.0.1/java.io.BufferedReader.readLine(BufferedReader.java:326)
 java.base@12.0.1/java.io.BufferedReader.readLine(BufferedReader.java:392)
 app//com.vaadin.flow.server.DevModeHandler.readLinesLoop(DevModeHandler.java:488)
 app//com.vaadin.flow.server.DevModeHandler.lambda$logStream$2(DevModeHandler.java:456)
 app//com.vaadin.flow.server.DevModeHandler$$Lambda$650/0x00000008015b4840.run(Unknown Source)
 java.base@12.0.1/java.lang.Thread.run(Thread.java:835)
2020-07-10 09:20:47.758  INFO 6032 --- [  restartedMain] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-07-10 09:20:47.767 ERROR 6032 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'referenceForm' defined in file [D:\intellij-projects\testProjects\vaadin-testui\target\classes\de\laprison\vaadin\reference\ReferenceForm.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [de.laprison.vaadin.reference.ReferenceForm]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1320) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
    at de.laprison.vaadin.Application.main(Application.java:14) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.2.0.RELEASE.jar:2.2.0.RELEASE]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [de.laprison.vaadin.reference.ReferenceForm]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:213) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1312) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    ... 22 common frames omitted
Caused by: java.lang.NullPointerException: null
    at com.vaadin.flow.component.datepicker.DatePicker.<init>(DatePicker.java:89) ~[vaadin-date-picker-flow-2.1.0.jar:na]
    at com.vaadin.flow.component.datepicker.DatePicker.<init>(DatePicker.java:76) ~[vaadin-date-picker-flow-2.1.0.jar:na]
    at de.laprison.vaadin.reference.ReferenceForm.<init>(ReferenceForm.java:26) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500) ~[na:na]
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481) ~[na:na]
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:200) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    ... 24 common frames omitted
 
L

lusitano

Moin.

Ich habe eine Testprojekt erstellt und eine init() Methode mit @PostConstruct erstellt (der Timepicker funktioniert auch ohne init())
Das funktioniert jetzt auch wie gewollt. Danke hier noch mal an @Flown
Nun aber meine Frage.
Wieso ?
Also ich meine wieso muss der Datepicker in die init() @PostConstruct Methode ?


Code:
import com.vaadin.flow.component.datepicker.DatePicker;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.component.timepicker.TimePicker;

import javax.annotation.PostConstruct;
import java.time.LocalDate;
import java.time.LocalTime;

public class DatePickers extends VerticalLayout {

    TimePicker timePicker = new TimePicker();

    public DatePickers() {

       add(configTimePicker(), configDatePicker());
    }

    @PostConstruct
    public void init(){
        configTimePicker();
        configDatePicker();
    }

    private TimePicker configTimePicker() {
        timePicker.setLabel("YOLO");
        timePicker.setValue(LocalTime.now());
        return timePicker;
    }

    private DatePicker configDatePicker() {
        DatePicker datePicker = new DatePicker();
        datePicker.setLabel("Date");
        datePicker.setValue(LocalDate.now());
        return datePicker;
    }

}
 
L

lusitano

Update:
Ich habe an dem funktionierendem Projekt etwas weiter gebastelt nur um zu schauen wie was funktioniert /oder auch nicht funktioniert).
Heraus kam das.

Main

Code:
import com.vaadin.flow.component.datepicker.DatePicker;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.router.Route;
import io.vaadin.test.testpackage.DatePickers;

@Route("")
public class MainView extends VerticalLayout {

    private final DatePickers datePickers;


    public MainView() {
        DatePicker datePicker = new DatePicker();
        addClassName("centered-content");

        datePickers = new DatePickers();

        DatePicker datePicker1 = datePickers.configDatePicker();

        add(datePicker, datePicker1);
    }

}
DatePickers
Code:
import com.vaadin.flow.component.datepicker.DatePicker;

import java.time.LocalDate;

public class DatePickers {

    public DatePicker configDatePicker() {
        DatePicker datePicker = new DatePicker();
        datePicker.setLabel("Datumsanzeige");
        datePicker.setValue(LocalDate.now());
        return datePicker;
    }

}
Jetzt frage ich mich natürlich warum das hier funktioniert.

1. Müsste nicht die Klasse Datepickers mit einer @Service o.Ä. Annotation versehen sein ?
2. Wieso funktioniert das hier jetzt ohne @PostConstruct init() ?

Wäre super wen jemand noch mal drüber schauen könnte.
Danke schon mal.
 
mrBrown

mrBrown

Wenn du die Klasse mit @Service annontierst, erstellt Spring direkt beim Start eine Instanz, die du dann injecten lassen kannst.

Du erstellst die Instanz aber selbst mit new selbst, die Service-Annotation ist also egal und die von Spring erstellte Instanz wird nicht genutzt.



Der Fehler zu Anfang war die "zu frühe" Erstellung der Instanz, offensichtlich war Vaadin dabei noch nicht passend initialisiert. Mit PostConstruct verschiebst du das ganze nach hinten, deshalb hatte es geholfen.
 
Thema: 

Vaadin: Datepicker

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