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I'm trying to create a web project using Spring-boot + Vaadin and i want to use spring-data-jpa with hibernate to fetch the data from PostgreSQL database.
In my Vaadin's view i try to autowire my service class but i always get null and eror stack trace doesn't tell me why.
kotlin.UninitializedPropertyAccessException: lateinit property clientService has not been initialized at 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 Method) ~[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(Native Method) ~[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$SocketProcessor.doRun(NioEndpoint.java:1455) [tomcat-embed-core-8.5.15.jar:8.5.15] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.15.jar:8.5.15] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131] at java.util.concurrent.ThreadPoolExecutor$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]
My config for database:
@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()
}
View and UI:
@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>
My Service:
@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()
}
}
And repository:
@Repository
interface ClientRepository : CrudRepository<Client, Long>
Project compiles correctly, but when i try to get any data from my database i get this error. I also tried to create connection and queries manually and when i did it i didn't get any errors. Probably, the error in the datasource config but i don't see it.
Thank you for your help!
UPDATED Solution:
@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 {...}
806
In order to create a "lateInit" variable, we just need to add the keyword "lateInit" as an access modifier of that variable. Following are a set of conditions that need to be followed in order to use "lateInit" in Kotlin. Use "lateInit" with a mutable variable. That means, we need to use "var" keyword with "lateInit".
Kotlin @Autowired setter based injectionAnnotate your setter method with the @Autowired annotation. Spring container will look at the @Autowired annotation and calls your setter method to inject the required dependencies.
This is because you try to access clientService in init block, you shouldn't do that, spring Dependency Injection occurs after the object was ready created. for example:
@Autowired
lateinit var clientService: IClientService
init{
// v--- `clientService` is not injected by spring yet.
clientService;
}
On the other hand, you should implements InitializingBean for the spring component initialization, for example:
open class Index : VerticalLayout(), View, InitializingBean {
@Autowired
lateinit var clientService: IClientService
override fun afterPropertiesSet(){
//copy your init block code here
}
}
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