我尝试使用Spring-boot + Vaadin创建一个Web项目，我想使用spring-data-jpa和hibernate从PostgreSQL数据库中获取数据。
在我的Vaadin的视图中，我尝试自动装配我的服务类但是我总是得到null并且错误堆栈跟踪并没有告诉我原因。
kotlin.UninitializedPropertyAccessException：lateinit属性 clientService尚未初始化 com.apache.vaadin.view.Index.getClientService（Index.kt：24） 〜[classes /：na] at com.apache.vaadin.view.Index $ readButton $ 1.buttonClick（Index.kt：40） 〜[classes /：na] at sun.reflect.NativeMethodAccessorImpl.invoke0（Native 方法）〜[na：1.8.0_131] at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62） 〜[na：1.8.0_131] at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43） 〜[na：1.8.0_131] at java.lang.reflect.Method.invoke（Method.java:498） 〜[na：1.8.0_131] at com.vaadin.event.ListenerMethod.receiveEvent（ListenerMethod.java:510） 〜[vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.event.EventRouter.fireEvent（EventRouter.java:211） 〜[vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.event.EventRouter.fireEvent（EventRouter.java:174） 〜[vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.AbstractClientConnector.fireEvent（AbstractClientConnector.java:1029） 〜[vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.ui.Button.fireClick（Button.java:370） 〜[vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.ui.Button $ 1.click（Button.java:57） 〜[vaadin-server-8.0.6.jar：8.0.6] at sun.reflect.NativeMethodAccessorImpl.invoke0（原生方法） 〜[na：1.8.0_131] at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62） 〜[na：1.8.0_131] at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43） 〜[na：1.8.0_131] at java.lang.reflect.Method.invoke（Method.java:498） 〜[na：1.8.0_131] at com.vaadin.server.ServerRpcManager.applyInvocation（ServerRpcManager.java:155） 〜[vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.ServerRpcManager.applyInvocation（ServerRpcManager.java:116） 〜[vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.communication.ServerRpcHandler.handleInvocation（ServerRpcHandler.java:445） [vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.communication.ServerRpcHandler.handleInvocations（ServerRpcHandler.java:410） [vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.communication.ServerRpcHandler.handleRpc（ServerRpcHandler.java:274） [vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest（UidlRequestHandler.java:90） [vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.SynchronizedRequestHandler.handleRequest（SynchronizedRequestHandler.java:41） [vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.VaadinService.handleRequest（VaadinService.java:1464） [vaadin-server-8.0.6.jar：8.0.6] at com.vaadin.server.VaadinServlet.service（VaadinServlet.java:381） [vaadin-server-8.0.6.jar：8.0.6] at javax.servlet.http.HttpServlet.service（HttpServlet.java:742） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52） [tomcat-embed-websocket-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.springframework.web.filter.RequestContextFilter.doFilterInternal（RequestContextFilter.java:99） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal（HttpPutFormContentFilter.java:105） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:81） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:197） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:198） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:478） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:140） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:80） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:87） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:342） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:799） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:861） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1455） [tomcat-embed-core-8.5.15.jar：8.5.15] at org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49） [tomcat-embed-core-8.5.15.jar：8.5.15] at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142） [na：1.8.0_131] at java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:617） [na：1.8.0_131] at org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61） [tomcat-embed-core-8.5.15.jar：8.5.15] at 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()
}
查看和用户界面：
@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")
}
}
的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>
项目正确编译，但是当我尝试从我的数据库中获取任何数据时，我收到此错误。我还尝试手动创建连接和查询，当我这样做时，我没有得到任何错误。可能是数据源配置中的错误，但我没有看到它。
感谢您的帮助！
已更新 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 {...}
答案 0 :(得分：6)
这是因为您尝试访问clientService块中的init，您不应该这样做，春天依赖注入会在对象准备好后发生。例如：
@Autowired
lateinit var clientService: IClientService
init{
// v--- `clientService` is not injected by spring yet.
clientService;
}
另一方面，您应该为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
}
}