VaadinSession在Spring Boot应用程序中失败

我认为那很苛刻 . 我设法用Spring Session JDBC Build 一个基本环境，并添加了几个 View .

@SpringUI
@SpringViewDisplay
public class MyUI extends UI implements ViewDisplay {

    private Panel springViewDisplay;
    private static final long serialVersionUID = -5326618953003021331L;

    @Override
    protected void init(VaadinRequest request) {
        final VerticalLayout root = new VerticalLayout();
        root.setSizeFull();
        setContent(root);

        final CssLayout navigationBar = new CssLayout();
        navigationBar.addStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);
        navigationBar.addComponent(createNavigationButton("Nómina",
            DefaultView.VIEW_NAME));
        navigationBar.addComponent(createNavigationButton("Empleados",
            EmpleadosAdminView.VIEW_NAME));
        root.addComponent(navigationBar);

        springViewDisplay = new Panel();
        springViewDisplay.setSizeFull();
        root.addComponent(springViewDisplay);
        root.setExpandRatio(springViewDisplay, 1.0f);
    }
}

DefaultView 加载正常：

@SpringView(name = DefaultView.VIEW_NAME)
public class DefaultView extends VerticalLayout implements View {

    public static final String VIEW_NAME = "";
    private static final long serialVersionUID = 3600517630040771693L;

    @PostConstruct
    void init() {
        addComponent(new Label("Default view"));
    }

    @Override
    public void enter(ViewChangeListener.ViewChangeEvent event) {
    // This view is constructed in the init() method()
    }
}

但是，第二个视图在访问时会抛出以下异常：

@SpringView(name = EmpleadosAdminView.VIEW_NAME)
public class EmpleadosAdminView extends VerticalLayout implements View {

    public static final String VIEW_NAME = "empleados";
    private static final long serialVersionUID = 3344332615518673282L;

    private final EmpleadoRepository empleadoRepository;
    private final EmpleadosEditor empleadosEditor;

    private final Grid<Empleado> grid;

    private final TextField filter;

    private final Button addNewEmpleado;

    @Autowired
    public EmpleadosAdminView(EmpleadoRepository empleadoRepository, EmpleadosEditor empleadosEditor) {
        this.empleadoRepository = empleadoRepository;
        this.empleadosEditor = empleadosEditor;
        this.grid = new Grid<>(Empleado.class);
        this.filter = new TextField();
        this.addNewEmpleado = new Button("Agregar nuevo empleado", VaadinIcons.PLUS);
    }

    private void listEmpleados(String filterText) {
        if (StringUtils.isEmpty(filterText)) {
           grid.setItems(empleadoRepository.findAll());
        } else {
        grid.setItems(empleadoRepository.findByNombreIgnoreCase(filterText));
        }
    }

    @Override
    public void enter(ViewChangeListener.ViewChangeEvent event) {
        HorizontalLayout actions = new HorizontalLayout(filter, addNewEmpleado);
        VerticalLayout mainLayout = new VerticalLayout(actions, grid, empleadosEditor);
        addComponent(mainLayout);

        grid.setHeight(300, Unit.PIXELS);
        grid.setColumns("id", "nombre", "cedula");

    filter.setPlaceholder("Filtrar por nombre");

    filter.setValueChangeMode(ValueChangeMode.LAZY);
    filter.addValueChangeListener(e -> listEmpleados(e.getValue()));

    grid.asSingleSelect().addValueChangeListener(e ->
            empleadosEditor.editEmpleado(e.getValue())
    );

    addNewEmpleado.addClickListener(e -> empleadosEditor.editEmpleado(new Empleado()));

    empleadosEditor.setChangeHandler(() -> {
        empleadosEditor.setVisible(false);
        listEmpleados(filter.getValue());
    });

    listEmpleados(null);
}
}

Hibernate：选择empleado0_.id为id1_0_，empleado0_.activo为activo2_0_，empleado0_.cedula为cedula3_0_，empleado0_.nombre为nombre4_0_来自Empleado empleado0_ 2018-03-20 19：07：21.222 WARN 13380 --- [nio-8080- exec-3] com.vaadin.event.ListenerMethod：应用程序序列化出错：类com.tomasa.nomina.ui.EmpleadosEditor $$ Lambda $ 658/1513980400必须实现序列化 . 2018-03-20 19：07：21.230 ERROR 13380 --- [nio-8080-exec-3] com.vaadin.server.DefaultErrorHandler：org.springframework.core.convert.ConversionFailedException：无法从类型[java . lang.Object]为值'com.vaadin.server.VaadinSession@22659fd5'键入[byte []];嵌套异常是org.springframework.core.serializer.support.SerializationFailedException：无法使用DefaultSerializer序列化对象;嵌套异常是java.io.NotSerializableException：org.springframework.dao.support.PersistenceExceptionTranslationInterceptor org.springframework.core.convert.support.ConversionUtils.invokeConverter（ConversionUtils.java:46）〜[spring-core-5.0.4.RELEASE .jar：5.0.4.RELEASE]在org.springframework.core.convert.support.GenericConversionService.convert（GenericConversionService.java:191）〜[spring-core-5.0.4.RELEASE.jar：5.0.4.RELEASE]在org.springframework.session.jdbc.JdbcOperationsSessionRepository.serialize(JdbcOperationsSessionRepository.java:575）〜[spring-session-jdbc-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.springframework.session.jdbc . JdbcOperationsSessionRepository.access $ 500（JdbcOperationsSessionRepository.java:130）〜[spring-session-jdbc-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.springframework.session.jdbc.JdbcOperationsSessionRepository $ 2.lambda $ doInTransactionWithoutResult $ 2（ org.s的JdbcOperationsSessionRepository.java:440)~ [spring-session-jdbc-2.0.2.RELEASE.jar：2.0.2.RELEASE] pringframework.jdbc.core.JdbcTemplate.lambda $ update $ 0（JdbcTemplate.java:853）〜[spring-jdbc-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.springframework.jdbc.core.JdbcTemplate . 执行（JdbcTemplate.java:605）〜[spring-jdbc-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.springframework.jdbc.core.JdbcTemplate.update（JdbcTemplate.java:850)~ [spring -jdbc-5.0.4.RELEASE.jar：5.0.4.RELEASE]在org.springframework.jdbc.core.JdbcTemplate.update（JdbcTemplate.java:905）〜[spring-jdbc-5.0.4.RELEASE.jar： 5.0.4.RELEASE] org.springframework.session.jdbc.JdbcOperationsSessionRepository $ 2.doInTransactionWithoutResult（JdbcOperationsSessionRepository.java:437）〜[spring-session-jdbc-2.0.2.RELEASE.jar：2.0.2.RELEASE] at org orsp.springframework.transaction.support.TransactionTemplate.execute中的.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction（TransactionCallbackWithoutResult.java:36）〜[spring-tx-5.0.4.RELEASE.jar：5.0.4.RELEASE] TransactionTemplate.java:140)~ [spring-tx-5.0.4.RELEASE.jar： 5.0.4.RELEASE]在org.springframework.session.jdbc.JdbcOperationsSessionRepository.save(JdbcOperationsSessionRepository.java:409）〜[spring-session-jdbc-2.0.2.RELEASE.jar：2.0.2.RELEASE] at org . springframework.session.jdbc.JdbcOperationsSessionRepository.save（JdbcOperationsSessionRepository.java:130）〜[spring-session-jdbc-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.springframework.session.web.http.SessionRepositoryFilter $ SessionRepositoryRequestWrapper.commitSession（SessionRepositoryFilter.java:228）〜[spring-session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.springframework.session.web.http.SessionRepositoryFilter $ SessionRepositoryRequestWrapper.access $ 100 （SessionRepositoryFilter.java:196）〜[spring-session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE]在org.springframework.session.web.http.SessionRepositoryFilter $ SessionRepositoryResponseWrapper.onResponseCommitted（SessionRepositoryFilter.java： 184）〜[spring-session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.springframework.session.web.http.OnCo在org.springframework.session.web.http.OnCommittedResponseWrapper.checkContentLength（OnCommittedResponseWrapper.java）中的mmittedResponseWrapper.doOnResponseCommitted（OnCommittedResponseWrapper.java:227）〜[spring-session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE] ：217）〜[spring-session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.springframework.session.web.http.OnCommittedResponseWrapper.trackContentLength（OnCommittedResponseWrapper.java:177）〜[spring- session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE] at org.springframework.session.web.http.OnCommittedResponseWrapper.access $ 1100（OnCommittedResponseWrapper.java:38）〜[spring-session-core-2.0 . 2.RELEASE.jar：2.0.2.RELEASE] at org.springframework.session.web.http.OnCommittedResponseWrapper $ SaveContextServletOutputStream.write（OnCommittedResponseWrapper.java:613）〜[spring-session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.springframework.security.web.util.OnCommittedResponseWrapper $ SaveContextServletOutputStream.write（OnCommittedResponseWrapper.java:633）〜[spring-security -web-5.0.3.RELEASE.jar：5.0.3.RELEASE]在org.springframework.security.web.util.OnCommittedResponseWrapper $ SaveContextServletOutputStream.write（OnCommittedResponseWrapper.java:633）〜[spring-security-web-5.0 . 3.RELEASE.jar：5.0.3.RELEASE] com的com.vaadin.server.communication.UIInitHandler.commitJsonResponse（UIInitHandler.java:126）〜[vaadin-server-8.3.1.jar：8.3.1] . vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest（UidlRequestHandler.java:109）〜[vaadin-server-8.3.1.jar：8.3.1] at com.vaadin.server.SynchronizedRequestHandler.handleRequest（SynchronizedRequestHandler.java:40）〜 [vaadin-server-8.3.1.jar：8.3.1] at com.vaadin.server.VaadinService.handleRequest（VaadinService.java:1601)~ [vaadin-server-8.3.1.jar：8.3.1] at com .vaadin.server.VaadinServlet.service（VAA dinServlet.java:445）[vaadin-server-8.3.1.jar：8.3.1] at javax.servlet.http.HttpServlet.service（HttpServlet.java:742）[tomcat-embed-core-8.5.28.jar ：8.5.28] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.apache.catalina.core . ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）[tomcat -embed-websocket-8.5.28.jar：8.5.28] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.28.jar：8.5.28 ] org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain . org.springframework.sec上的doFilter（FilterChainProxy.java:320）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE]在org.springframework.security.web.access上的urity.web.access.intercept.FilterSecurityInterceptor.invoke（FilterSecurityInterceptor.java:127）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] . org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy . ）中的intercept.FilterSecurityInterceptor.doFilter（FilterSecurityInterceptor.java:91）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] . java：334）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] org.springframework.security.web.access.ExceptionTranslationFilter.doFilter（ExceptionTranslationFilter.java:119）[spring-security] -web-5.0.3.RELEASE.jar：5.0.3.RELEASE]在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:334）[spring-security-web-5.0.3.RELEASE .jar：5.0.3.RELEASE]在org.springframework.security.web.session.SessionManagementFilter.doFilter（SessionManagementFilter.java:137）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE在org.springf orme.springframework.security.web.authentication中的ramework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:334）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] . 匿名身份验证过滤.doFilter（AnonymousAuthenticationFilter.java:111）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE]在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java： 334）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter（SecurityContextHolderAwareRequestFilter.java:170)[spring-security-web -5.0.3.RELEASE.jar：5.0.3.RELEASE]在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:334）[spring-security-web-5.0.3.RELEASE.jar ：5.0.3.RELEASE] at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter（RequestCacheAwareFilter.java:63）[spring-security-web-5.0.3.RE LEASE.jar：5.0.3.RELEASE]在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:334）[spring-security-web-5.0.3.RELEASE.jar：5.0.3 . 发布org.springframework上的org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal（BasicAuthenticationFilter.java:215）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] .web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE]在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy） .java：334）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] org.springframework.security.web.authentication.logout.LogoutFilter.doFilter（LogoutFilter.java:116）[ spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] at org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:334）[spring-security-web-5.0 . 3.RELEASE.jar：5.0.3.RELEASE] atorg.springframework.security.web.header.HeaderWriterFilter.doFilterInternal（HeaderWriterFilter.java:66）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] org.springframework.web.filter . 在Org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:334）上的OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter [security-security-web-5.0-.RELEASE.jar：5.03.RELEASE] .3.RELEASE.jar：5.0.3.RELEASE]在org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:334）[spring-security-web-5.0.3.RELEASE.jar：5.0 .3.RELEASE]在org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal（WebAsyncManagerIntegrationFilter.java:56）[spring-security-web-5.0.3.RELEASE.jar：5.0.3 . 在org.springframework.security.web.FilterChainProxy上的org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE]发布$ VirtualFilterChain.doFilter（FilterChainProxy.java:334）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] org.springframework.security.web.FilterChainProxy.doFilterInternal（FilterChainProxy.java:215 ）[spring-security-web-5.0.3.RELEASE.jar：5.0.3.RELEASE] org.springframework.security.web.FilterChainProxy.doFilter（FilterChainProxy.java:178）[spring-security-web-5.0 . 3.RELEASE.jar：5.0.3.RELEASE]在org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate（DelegatingFilterProxy.java:357）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.apringframe.web.filter.DelegatingFilterProxy.doFilter（DelegatingFilterProxy.java:270）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter （ApplicationFilterChain.java:193）[汤姆cat-embed-core-8.5.28.jar：8.5.28] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.28.jar：8.5 . 28] org.springframework.web.filter.RequestContextFilter.doFilterInternal（RequestContextFilter.java:99）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.springframework.web.filter.OncePerRequestFilter .doFilter（OncePerRequestFilter.java:107）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat- embed-core-8.5.28.jar：8.5.28] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.28.jar：8.5.28] org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal（HttpPutFormContentFilter.java:109）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] org.springframework.web.filter.OncePerRequestFilter.doFilter （OncePerRequestFilter.java:107）[spring-web-5.0.4.RELEASE.j ar：5.0.4.RELEASE]在org.apache.catalina的org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.28.jar：8.5.28] .core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:81）[在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）的spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] [spring-web-5.0.4.RELEASE.jar： 5.0.4.RELEASE] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.28.jar：8.5.28] org.apache.catalina.core .ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal（SessionRepositoryFilter.java:146）[ spring 会话核心2.0.2.RELEASE.j ar：2.0.2.RELEASE] at org.springframework.session.web.http.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:81）[spring-session-core-2.0.2.RELEASE.jar：2.0.2.RELEASE] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain） .java：166）[tomcat-embed-core-8.5.28.jar：8.5.28] org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:200）[spring-web-5.0.4 . RELEASE.jar：5.0.4.RELEASE] org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring-web-5.0.4.RELEASE.jar：5.0.4.RELEASE] at org .apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java ：166）[tomcat-embed-core-8.5.28.jar：8.5.28]在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:199）[tomcat-embed-core-8.5.28.jar：8.5 .28] org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.apache.catalina.authenticator.AuthenticatorBase . 在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:140）调用（AuthenticatorBase.java:496）[tomcat-embed-core-8.5.28.jar：8.5.28] [tomcat-embed-core -8.5.28.jar：8.5.28] org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:81）[tomcat-embed-core-8.5.28.jar：8.5.28] at org . apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:87）[tomcat-embed-core-8.5.28.jar：8.5.28]在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java： 342）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:803）[tomcat-embed-core-8.5.28.jar ：8 .5.28] org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66）[tomcat-embed-core-8.5.28.jar：8.5.28] at org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（抽象协议.java：790）[tomcat-embed-core-8.5.28.jar：8.5.28]在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1459）[tomcat-embed -core-8.5.28.jar：8.5.28] at org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）[tomcat-embed-core-8.5.28.jar：8.5.28 ] java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149）[na：1.8.0_161] at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:624)[na:1.8.0_161 ] atg.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）[tomcat-embed-core-8.5.28.jar：8.5.28] at java.lang.Thread.run（ Thread.java:748)[na：1.8.0_161]

我的代码基于这些教程：

http://vaadin.github.io/spring-tutorial/ https://spring.io/guides/gs/crud-with-vaadin/

不确定我做错了什么，或者是否有一些我需要修改的配置 . 基本认证配置如下：

JDBCHttpSessionConfig.java

@Configuration
@EnableJdbcHttpSession
public class JdbcHttpSessionConfig {
}

SecurityConfig.java

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    private static final Logger LOG = LoggerFactory.getLogger(SecurityConfig.class);

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .csrf().disable() // Use Vaadin's CSRF protection
                .authorizeRequests().anyRequest().authenticated() // User must be authenticated to access any part of the application
                .and()
                .httpBasic();
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/css/*"); // Static resources are ignored
    }
}