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BeanCreationException Utilisation de Vaadin et CRUD findAll() Service pour remplir ComboBox

2017-07-11 5 views
0

J'utilise Vaadin8 avec SpringBoot en utilisant vaadin-spring-boot-starter 2.0.0 pour remplir un ComboBox. J'ai essayé la même chose avec NativeSelect, toujours eu le même message d'erreur, quand j'utilise la méthode setItem() de la ComboBox.BeanCreationException Utilisation de Vaadin et CRUD findAll() Service pour remplir ComboBox

repo:

public interface UserCategoryRepo extends CrudRepository<UserCategory, Long> { 
}

Service:

@Service 
@Transactional 
public class UserCategoryServiceImpl implements UserCategoryService { 
    @Autowired 
    UserCategoryRepo userCategoryRepo; 

    @Override 
    public void saveCategory(UserCategory userCategory) { 
     userCategoryRepo.save(userCategory); 
    } 

    @Override 
    public List<UserCategory> lisUserCategories() { 
     List<UserCategory> categoryList = new ArrayList<>(); 
     for(UserCategory userCategory : userCategoryRepo.findAll()) 
      categoryList.add(userCategory); 
     return categoryList; 
    } 
}

Classe Forme:

ppublic class TryVaadin extends FormLayout { 

private TryVaadinUI tryVaadinUI; 

@Autowired 
UserCategoryServiceImpl service; 

public TryVaadin(TryVaadinUI tryVaadinUI) { 
    this.tryVaadinUI = tryVaadinUI; 

    ComboBox<UserCategory> userCategoryCombox = new ComboBox<>("Choose Category"); 
    userCategoryCombox.setItems(service.lisUserCategories()); 

    Button saveButton = new Button("Save"); 
    HorizontalLayout components = new HorizontalLayout(saveButton); 
    TextField name = new TextField("Enter Name:"); 
    addComponents(name, userCategoryCombox, components); 
} 
}

classe UI:

@SpringUI(path = "/try") 
public class TryVaadinUI extends UI { 

    @Autowired 
    TryVaadin form = new TryVaadin(this); 

    @Override 
    protected void init(VaadinRequest vaadinRequest) { 
     final VerticalLayout layout = new VerticalLayout(); 
     layout.addComponents(form); 

      setContent(layout); 
     } 
    }

Pourquoi ai-je cette erreur ?! Quelqu'un peut-il expliquer s'il vous plaît ... Par ailleurs, service.lisUserCategories() fonctionne partout ailleurs!

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tryVaadinUI' defined in file [C:\Users\consc\Desktop\Advanced Software Engineering\gs-accessing-data-jpa-master\gs-accessing-data-jpa-master\TryPLMA\target\classes\com\pringwa\controller\TryVaadinUI.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.pringwa.controller.TryVaadinUI]: Constructor threw exception; nested exception is java.lang.NullPointerException 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1155) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:345) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at com.vaadin.spring.internal.BeanStore.create(BeanStore.java:71) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.UIScopeImpl$UIBeanStore.create(UIScopeImpl.java:282) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.BeanStore.get(BeanStore.java:62) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.SessionLockingBeanStore.get(SessionLockingBeanStore.java:46) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.UIScopeImpl.get(UIScopeImpl.java:79) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:340) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:220) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1018) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:345) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:340) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1093) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at com.vaadin.spring.server.SpringUIProvider.createInstance(SpringUIProvider.java:203) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI(UIInitHandler.java:191) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:74) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1464) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:381) [vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:108) [spring-boot-actuator-1.5.2.RELEASE.jar:1.5.2.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106) [spring-boot-actuator-1.5.2.RELEASE.jar:1.5.2.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_66] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_66] 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66] 
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.pringwa.controller.TryVaadinUI]: Constructor threw exception; nested exception is java.lang.NullPointerException 
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:154) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1147) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    ... 71 common frames omitted 
Caused by: java.lang.NullPointerException: null 
    at com.pringwa.controller.TryVaadin.<init>(TryVaadin.java:30) ~[classes/:na] 
    at com.pringwa.controller.TryVaadinUI.<init>(TryVaadinUI.java:15) ~[classes/:na] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_66] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_66] 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_66] 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[na:1.8.0_66] 
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    ... 73 common frames omitted 

2017-07-18 01:44:34.866 ERROR 29140 --- [nio-8080-exec-6] o.a.c.c.C.[.[.[/].[springVaadinServlet] : Servlet.service() for servlet [springVaadinServlet] in context with path [] threw exception [com.vaadin.server.ServiceException: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tryVaadinUI' defined in file [C:\Users\consc\Desktop\Advanced Software Engineering\gs-accessing-data-jpa-master\gs-accessing-data-jpa-master\TryPLMA\target\classes\com\pringwa\controller\TryVaadinUI.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.pringwa.controller.TryVaadinUI]: Constructor threw exception; nested exception is java.lang.NullPointerException] with root cause 

java.lang.NullPointerException: null 
    at com.pringwa.controller.TryVaadin.<init>(TryVaadin.java:30) ~[classes/:na] 
    at com.pringwa.controller.TryVaadinUI.<init>(TryVaadinUI.java:15) ~[classes/:na] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_66] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_66] 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_66] 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[na:1.8.0_66] 
    at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:142) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1147) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1099) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:345) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at com.vaadin.spring.internal.BeanStore.create(BeanStore.java:71) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.UIScopeImpl$UIBeanStore.create(UIScopeImpl.java:282) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.BeanStore.get(BeanStore.java:62) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.SessionLockingBeanStore.get(SessionLockingBeanStore.java:46) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.spring.internal.UIScopeImpl.get(UIScopeImpl.java:79) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:340) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:220) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveNamedBean(DefaultListableBeanFactory.java:1018) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:345) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:340) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1093) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at com.vaadin.spring.server.SpringUIProvider.createInstance(SpringUIProvider.java:203) ~[vaadin-spring-2.0.0.jar:2.0.0] 
    at com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI(UIInitHandler.java:191) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:74) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1464) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:381) ~[vaadin-server-8.0-20170527.000245-173.jar:8.0-SNAPSHOT] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:108) ~[spring-boot-actuator-1.5.2.RELEASE.jar:1.5.2.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106) ~[spring-boot-actuator-1.5.2.RELEASE.jar:1.5.2.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.7.RELEASE.jar:4.3.7.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_66] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_66] 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66]

Source

2017-07-11 Marcellinus

+0

Vous ne postez pas la trace toute la pile, mais je vais prendre un coup de feu dans le noir. A l'intérieur de l'interface utilisateur, vous avez un 'nouveau TryVaadin (this)' qui à son tour a 'un nouveau UserServiceCategoryImpl()' qui a finalement un 'UserCategoryRepo' autowired. La chose est, sauf dans quelques cas particuliers tels que les méthodes annotées avec @ @ Bean' des classes '@ Configuration', quand vous instanciez un objet vous-même au lieu de le demander au contexte, le printemps n'a aucun moyen de savoir, et l'injection de dépendance n'a pas lieu, donc votre champ repo reste nul. – Morfic

+0

@Morfic Alors, quelle est la solution possible? – Marcellinus

+0

Je vois que vous avez fait quelques changements depuis la nuit dernière, et le NPE est maintenant différent, mais je ne vois pas de mises à jour de code, alors s'il vous plaît les ajouter s'il y en a. De la trace de la pile, il semble maintenant que vous avez défini votre TryVaadin comme un haricot géré par le printemps et peut-être annoté votre champ de service avec '@ Autowired'. Si tel est le cas, alors probablement TryVaadin: 32 où le NPE provient, est 'userCategoryCombox.setItems (service.lisUserCategories());'. En effet, le ressort doit instancier un objet avant d'injecter des champs autowired, donc quand le constructeur est appelé, le service sera toujours 'null'. – Morfic

Répondre

0

La solution que j'ai obtenue était, d'abord déplacer le contenu dans le constructeur de TryVaadin à une nouvelle méthode! La classe ressemblera à ceci:

public class TryVaadin extends FormLayout { 

    private static final long serialVersionUID = -4812112027634726927L; 
    private TryVaadinUI tryVaadinUI; 

    public TryVaadin() { 
    } 

    public void creat(List<UserCategory> list){ 
     ComboBox<UserCategory> userCategoryCombox = new ComboBox<>("Choose Category"); 
     userCategoryCombox.setItems(list); 

     Button saveButton = new Button("Save"); 
     HorizontalLayout components = new HorizontalLayout(saveButton); 
     TextField name = new TextField("Enter Name:"); 
     addComponents(name, userCategoryCombox, components); 
    } 
}

Maintenant, la classe UI TryVaadinUI ressemblera à ceci:

@SpringUI(path = "/try") 
public class TryVaadinUI extends UI { 

    private static final long serialVersionUID = -1301392602647903109L; 

    @Autowired 
    UserCategoryServiceImpl service; 

    TryVaadin form = new TryVaadin(); 

    @Override 
    protected void init(VaadinRequest vaadinRequest) { 
     final VerticalLayout layout = new VerticalLayout(); 
     form.creat(service.lisUserCategories()); 
     layout.addComponents(form); 

     setContent(layout); 
    } 
}

Source

2017-07-20 00:35:21 Marcellinus

0

Vous ne devez pas passer l'interface utilisateur à un composant.

Dans la classe TryVaadinUI la ligne

private TryVaadin form = new TryVaadin(this);

devrait être

private TryVaadin form = new TryVaadin();

et le constructeur TryVaadin ne doit pas prendre des paramètres. Vous pouvez accéder à l'interface utilisateur à l'aide de la fonction getUI() fournie et accessible dans la classe TryVaadin.

Source

2017-07-12 06:16:59

+1

S'il est vrai que vous pouvez utiliser 'getUI()', je ne vois pas wow cela est pertinent pour le problème décrit dans votre question. Qu'est-ce que je rate? – Morfic

+0

Je crois que 'new TryVaadin (this)' est appelé trop tôt (lors de l'initialisation de TryVaadinUI) ce qui fait que 'this' est nul. –

+0

Comme je suis sûr que vous le savez, 'this' est une référence à l'objet courant, donc [il n'y a aucun moyen que ce soit' null'] (https://stackoverflow.com/questions/3789528/can-this -ever-be-null-in-java). Et même si c'était le cas, pourquoi produirait-il un NPE puisque, à l'intérieur du constructeur TryVaadin, il ne fait rien d'autre que this.tryVaadinUI = tryVaadinUI. Au moins dans cette version du code que nous avons ... – Morfic

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