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大家，早安。我开始使用 vaadin 10，我正在尝试使用 Spring Jpa 在网格中设置项目，如下所示，但对我来说它标志着一个错误，这种情况不会发生在以前版本的 vaadin 中。

@HtmlImport("styles/shared-styles.html") @Route("") public class MainView extends VerticalLayout {

@Autowired
private UserService userService;

private Grid<User> grid = new Grid<>();

public MainView() { 

grid.setItems(userService.selectAll());

add(grid);

}

我收到以下错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.portal.app.spring.MainView': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.portal.app.spring.MainView]: Constructor threw exception; nested exception is java.lang.NullPointerException

.....

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.portal.app.spring.MainView]: Constructor threw exception; nested exception is java.lang.NullPointerException at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:182) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE] at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1228) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE] ... 72 common frames omitted Caused by: java.lang.NullPointerException: null

据我了解，这是由我的服务中的@autowire 引起的。

我希望有人与我分享我如何解决错误的想法，谢谢:)

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