尝试实例化Datepicker时发生NullpointerExceptioncom.vaadin.flow.component.datepicker.DatePicker

如何解决尝试实例化Datepicker时发生NullpointerExceptioncom.vaadin.flow.component.datepicker.DatePicker

这有点奇怪，但是当我尝试实例化DatePicker组件时，我会直接上Nullpointerexception：

DatePicker date = new DatePicker("Select date",LocalDate.now());

就这样，我进入了这一行（我已经在构造函数中尝试了不同的参数，并且也尝试了默认构造函数，但其​​中没有任何内容），并且由于Nullpointer而导致我的应用程序无法启动...

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lectureForm' defined in file [D:\IDEAProjects\university\target\classes\com\university\ui\views\forms\LectureForm.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.university.ui.views.forms.LectureForm]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:313)
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:294)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1358)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:893)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at com.university.Main.main(Main.java:13)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.university.ui.views.forms.LectureForm]: Constructor threw exception; nested exception is java.lang.NullPointerException
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:217)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:309)
    ... 25 common frames omitted
Caused by: java.lang.NullPointerException: null
    at com.vaadin.flow.component.datepicker.DatePicker.<init>(DatePicker.java:85)
    at com.university.ui.views.forms.LectureForm.configureFormComponents(LectureForm.java:126)
    at com.university.ui.views.forms.LectureForm.<init>(LectureForm.java:68)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:204)
    ... 27 common frames omitted

DatePicker中的第85行（始终是该行）是

this.setLabel(label);

在

 public DatePicker(String label,LocalDate initialDate,ValueChangeListener<ComponentValueChangeEvent<DatePicker,LocalDate>> listener) {
        this(initialDate);
        this.setLabel(label);
        this.addValueChangeListener(listener);
    }

所以我不知道为什么会发生这种情况，为什么它总是相同的构造函数（与参数无关），为什么问题出在标签上，最重要的是如何解决（-：

非常感谢您

解决方法

问题的根源出乎意料的是我用来运行应用程序的Spring Boot。 在IDE（IntelliJ IDEA）中的行顺序不正确，但带有链接标记。因此，实际上Nullpointerexception并不是在标签设置时抛出的，而是在方法UI.getCurrent()被调用并且DataPicker试图设置语言环境时抛出的。由于Spring（@SpringComponent的原因，方法调用到达时尚未构建Vaadin UI，因此返回值为null。解决方案：在类中添加@UIScope批注。