@Autowired lateinit 属性 '' 尚未初始化
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【中文标题】@Autowired lateinit 属性 \'\' 尚未初始化【英文标题】：@Autowired lateinit property '' has not been initialized@Autowired lateinit 属性 '' 尚未初始化 【发布时间】：2017-12-25 06:45:31 【问题描述】：我正在尝试使用 Spring-boot + Vaadin 创建一个 Web 项目，并且我想使用带有 hibernate 的 spring-data-jpa 从 PostgreSQL 数据库中获取数据。
在我的 Vaadin 看来，我尝试自动装配我的服务类，但我总是得到 null 并且错误堆栈跟踪没有告诉我原因。
kotlin.UninitializedPropertyAccessException：lateinit 属性 clientService 尚未初始化 com.apache.vaadin.view.Index.getClientService(Index.kt:24) 〜[类/：na]在 com.apache.vaadin.view.Index$readButton$1.buttonClick(Index.kt:40) ~[classes/:na] 在 sun.reflect.NativeMethodAccessorImpl.invoke0(Native 方法）~[na:1.8.0_131] 在 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131] 在 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131] 在 java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131] 在 com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510) ~[vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.event.EventRouter.fireEvent（EventRouter.java:211） ~[vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.event.EventRouter.fireEvent(EventRouter.java:174) ~[vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.AbstractClientConnector.fireEvent（AbstractClientConnector.java:1029） ~[vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.ui.Button.fireClick(Button.java:370) ~[vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.ui.Button$1.click(Button.java:57) ~[vaadin-server-8.0.6.jar:8.0.6] 在 sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法） ~[na:1.8.0_131] 在 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131] 在 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131] 在 java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131] 在 com.vaadin.server.ServerRpcManager.applyInvocation（ServerRpcManager.java:155） ~[vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.ServerRpcManager.applyInvocation（ServerRpcManager.java:116） ~[vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.communication.ServerRpcHandler.handleInvocation（ServerRpcHandler.java:445） [vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.communication.ServerRpcHandler.handleInvocations（ServerRpcHandler.java:410） [vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:274) [vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90) [vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41) [vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1464) [vaadin-server-8.0.6.jar:8.0.6] 在 com.vaadin.server.VaadinServlet.service（VaadinServlet.java:381） [vaadin-server-8.0.6.jar:8.0.6] 在 javax.servlet.http.HttpServlet.service(HttpServlet.java:742) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:342） [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131] 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131] 在 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.15.jar:8.5.15] 在 java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]
我的数据库配置：
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = arrayOf("com.apache.vaadin.model"))
@ComponentScan(basePackages = arrayOf("com.apache.vaadin.model"))
open class DataSourceConfig
@Autowired
lateinit var environment: Environment
@Bean
open fun entityManagerFactory(): LocalContainerEntityManagerFactoryBean
var entityManagerFactory: LocalContainerEntityManagerFactoryBean = LocalContainerEntityManagerFactoryBean()
entityManagerFactory.apply
dataSource = dataSource()
setPackagesToScan("com.apache.vaadin.model")
var vendorAdapter: HibernateJpaVendorAdapter = HibernateJpaVendorAdapter()
vendorAdapter.apply
setGenerateDdl(true)
setShowSql(true)
var properties: Properties = Properties()
properties.apply
put("database.dialet", "org.hibernate.dialect.PostgreSQL95Dialect")
put("database.globally_quoted_identifiers", "false")
put("database.enable_lazy_load_no_trans", "true")
put("database.show_sql", "true")
jpaVendorAdapter = vendorAdapter
setJpaProperties(properties)
return entityManagerFactory
@Primary
@Bean
open fun dataSource(): DataSource
var source: ComboPooledDataSource = ComboPooledDataSource()
source.apply
driverClass = "org.postgresql.Driver"
jdbcUrl = "jdbc:postgresql://localhost:5432/ignite"
user = "postgres"
password = "1111"
acquireIncrement = 5
idleConnectionTestPeriod = 60
maxPoolSize = 20
minPoolSize = 10
initialPoolSize = 10
return source
@Bean
open fun transactionManager() : PlatformTransactionManager
var manager: JpaTransactionManager = JpaTransactionManager()
manager.apply
entityManagerFactory = entityManagerFactory().nativeEntityManagerFactory
return manager
@Bean
open fun exceptionTranslator(): PersistenceExceptionTranslationPostProcessor = PersistenceExceptionTranslationPostProcessor()
视图和用户界面：
@SpringUI
@Title(value = "Apache")
class Navigator : UI()
@Autowired
lateinit var viewProvider: SpringViewProvider
init
private val INDEX = ""
override fun init(p0: VaadinRequest?)
navigator = Navigator(this, this)
navigator.addProvider(viewProvider)
navigator.addView(INDEX, Index::class.java)
@UIScope
@SpringView
open class Index : VerticalLayout(), View
private val logger: Logger = Logger.getLogger(Index::class.java)
@Autowired
lateinit var clientService: IClientService // <--- error is here
init
var menuBar: MenuBar = MenuBar()
var file = menuBar.addItem("File", null, null)
file.addItem("Save", _ -> logger.info("Save clicked"))
file.addItem("Load", _ -> logger.info("Load clicked"))
file.addItem("Open", _ -> logger.info("Open clicked"))
file.addItem("Close", _ -> logger.info("Close clicked"))
var settings = menuBar.addItem("Settings", null, null)
settings.addItem("DataBase", _ -> logger.info("DataBase clicked"))
addComponent(menuBar)
var createButton: Button = Button("Create", _ -> logger.info("Create clicked"))
var readButton: Button = Button("Read", _ -> logger.info(clientService.findAll()))
var updateButton: Button = Button("Update", _ -> logger.info("Update clicked"))
var deleteButton: Button = Button("Delete", _ -> logger.info("Delete clicked"))
addComponent(createButton)
addComponent(readButton)
addComponent(updateButton)
addComponent(deleteButton)
override fun enter(p0: ViewChangeListener.ViewChangeEvent?)
Notification.show("Welcome to the main com.ignite.app.view")
pom.xml：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.apache.vaadin</groupId>
<artifactId>ignite</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>ignite</name>
<description></description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<vaadin.version>8.0.6</vaadin.version>
<kotlin.version>1.1.3-2</kotlin.version>
<hibernate>5.2.9.Final</hibernate>
<hibernate-validator>5.4.1.Final</hibernate-validator>
<postgres>42.1.1</postgres>
</properties>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jre8</artifactId>
<version>$kotlin.version</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test</artifactId>
<version>$kotlin.version</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<version>$hibernate</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>$hibernate</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>$hibernate-validator</version>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>$postgres</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<version>$vaadin.version</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>$kotlin.version</version>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<configuration>
<jvmTarget>1.8</jvmTarget>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>testCompile</id>
<phase>test-compile</phase>
<goals>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
我的服务：
@NoRepositoryBean
interface IClientService : CrudRepository<Client, Long>
@Service
class ClientService : IClientService
private val logger: Logger = Logger.getLogger(ClientService::class.java)
@Autowired
lateinit var clientRepository: ClientRepository
override fun delete(p0: Long?)
clientRepository.delete(p0)
override fun delete(p0: MutableIterable<Client>?)
clientRepository.delete(p0)
override fun delete(p0: Client?)
clientRepository.delete(p0)
override fun <S : Client?> save(p0: MutableIterable<S>?): MutableIterable<S> = clientRepository.save(p0)
override fun <S : Client?> save(p0: S): S = clientRepository.save(p0)
override fun findAll(p0: MutableIterable<Long>?): MutableIterable<Client> = clientRepository.findAll(p0)
override fun findAll(): MutableIterable<Client> = clientRepository.findAll()
override fun exists(p0: Long?): Boolean = clientRepository.exists(p0)
override fun findOne(p0: Long?): Client = clientRepository.findOne(p0)
override fun count(): Long = clientRepository.count()
override fun deleteAll()
clientRepository.deleteAll()
和存储库：
@Repository
interface ClientRepository : CrudRepository<Client, Long>
项目编译正确，但是当我尝试从我的数据库中获取任何数据时，我得到了这个错误。我还尝试手动创建连接和查询，当我这样做时，我没有收到任何错误。可能是数据源配置中的错误，但我没有看到。
感谢您的帮助！
更新 解决方案：
@SpringUI
@Title(value = "Apache")
class Navigator : UI()
@Autowired
lateinit var viewProvider: SpringViewProvider
@Autowired
lateinit var index: Index// <-
private val INDEX = "index"
override fun init(p0: VaadinRequest?)
navigator = Navigator(this, this)
navigator.addProvider(viewProvider)
navigator.addView(INDEX, index) // <-
@UIScope
@SpringView
@SpringComponent // <-
open class Index : VerticalLayout(), View ...
【问题讨论】：
【参考方案1】：这是因为你试图在init 块中访问clientService，你不应该那样做，spring 依赖注入发生在对象准备好创建之后。例如：
@Autowired
lateinit var clientService: IClientService
init
// v--- `clientService` is not injected by spring yet.
clientService;
另一方面，你应该为spring组件初始化实现InitializingBean，例如：
open class Index : VerticalLayout(), View, InitializingBean
@Autowired
lateinit var clientService: IClientService
override fun afterPropertiesSet()
//copy your init block code here
【讨论】：
我尝试使用这个：open class Index : VerticalLayout(), View, InitializingBean @Autowired lateinit var clientService: IClientService override fun afterPropertiesSet() //copy your init block code here 但我仍然得到同样的错误。我还尝试通过构造函数注入来注入我的服务。最后，我尝试在我调用 clientService.findAll 的 Index.view 中创建附加功能，但我再次遇到相同的错误：kotlin.UninitializedPropertyAccessException: lateinit property clientService has not been initialized
@NickRyan 请看这里：vaadin.com/docs/-/part/framework/advanced/advanced-spring.html
谢谢！最后，我工作了！我添加了注释 @SpringComponent 并修复了 Navigator 类：` @Autowired lateinit var viewProvider: SpringViewProvider @Autowired lateinit var index: Test private val INDEX = "" override fun init(p0: VaadinRequest?) navigator = Navigator(this, this) navigator .addProvider(viewProvider) navigator.addView(INDEX, index) ` 可能问题出在“addView”中，因为我发送的是类定义，而不是对象，它试图创建新对象而不是注入它。跨度>
@NickRyan 一点也不。因为你的代码太大了。我唯一能帮助你的是你可能错过的东西。以上是关于@Autowired lateinit 属性 '' 尚未初始化的主要内容，如果未能解决你的问题，请参考以下文章
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