问题：

@Autowired lateinit属性“”尚未初始化

葛奇

2023-03-14

我正在尝试使用Spring-boot+Vaadin创建一个web项目，并且希望使用spring-data-jpa和hibernate从PostgreSQL数据库中获取数据。

在我的Vaadin看来，我尝试自动连接我的服务类，但我总是得到null，而且eror堆栈跟踪没有告诉我原因。

数据库得我得配置：

@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>

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()
    }
}

@Repository
interface ClientRepository : CrudRepository<Client, Long>

更新的解决方案：

@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 {...}

颜高格

2023-03-14

这是因为您试图访问init块中的clientservice，您不应该这样做，因为spring依赖项注入发生在对象就绪创建之后。例如：

@Autowired
lateinit var clientService: IClientService

init{
    // v--- `clientService` is not injected by spring yet.
    clientService;
}

另一方面，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
   }
}

@Autowired lateinit属性“”尚未初始化

共有1个答案

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