线程 "main" io.micronaut.context.exceptions.DependencyInjectionException 中的异常：无法为 class 的参数注入值

Question

我无法通过 Gradle 任务注入依赖项

我的build.gradle

task runDataFeeder(type:JavaExec){
    classpath = sourceSets.main.runtimeClasspath
    main = "example.migrator.RunMigrator"
}

runDataFeeder class 指向 RunMigrator class

RunMigrator.kt

@Singleton
class Migrator(@Inject val pharmacySeedDataService: PharmacySeedDataService){
    fun migrate(){
        pharmacySeedDataService.createZone()
    }
}

open class RunMigrator {
    companion object {
        @JvmStatic
        fun main(args: Array<String>) {
            ApplicationContext.run().use { applicationContext ->
                val migrator: Migrator = applicationContext.getBean(Migrator::class.java)
                migrator.migrate()
            }
        }
    }
}

PharmacySeedDataService.kt包含

@Singleton
class PharmacySeedDataService(@Inject private val pharmacyService: PharmacyService, @Inject private val roleService: RoleService) {

    fun createZone() {
       
    }
}

并且PharmacyService.kt包含

@Singleton
class PharmacyService(@Inject val pharmacyRepository: PharmacyRepository){
}

这里是PharmacyRepository.kt

@Singleton
interface PharmacyRepository {
    fun createZone(zoneName: String, locationName: String): Zone
}

但是我运行gradle任务后，抛出如下异常：

Exception in thread "main" io.micronaut.context.exceptions.DependencyInjectionException: Failed to inject value for parameter [pharmacyRepository] of class: delivery.core.pharmacy.PharmacyService

Message: No bean of type [delivery.core.pharmacy.PharmacyRepository] exists. Make sure the bean is not disabled by bean requirements (enable trace logging for 'io.micronaut.context.condition' to check) and if the bean is enabled then ensure the class is declared a bean and annotation processing is enabled (for Java and Kotlin the 'micronaut-inject-java' dependency should be configured as an annotation processor).
Path Taken: new Migrator([PharmacySeedDataService pharmacySeedDataService]) --> new PharmacySeedDataService([PharmacyService pharmacyService],RoleService roleService) --> new PharmacyService([PharmacyRepository pharmacyRepository])
    at io.micronaut.context.AbstractBeanDefinition.getBeanForConstructorArgument(AbstractBeanDefinition.java:1016)
    at delivery.core.pharmacy.$PharmacyServiceDefinition.build(Unknown Source)
    at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1693)
    at io.micronaut.context.DefaultBeanContext.createAndRegisterSingleton(DefaultBeanContext.java:2402)
    at io.micronaut.context.DefaultBeanContext.getBeanForDefinition(DefaultBeanContext.java:2084)
    at io.micronaut.context.DefaultBeanContext.getBeanInternal(DefaultBeanContext.java:2058)
    at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:1095)
    at io.micronaut.context.AbstractBeanDefinition.getBeanForConstructorArgument(AbstractBeanDefinition.java:1007)
    at delivery.core.pharmacy.$PharmacySeedDataServiceDefinition.build(Unknown Source)
    at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1693)
    at io.micronaut.context.DefaultBeanContext.createAndRegisterSingleton(DefaultBeanContext.java:2402)
    at io.micronaut.context.DefaultBeanContext.getBeanForDefinition(DefaultBeanContext.java:2084)
    at io.micronaut.context.DefaultBeanContext.getBeanInternal(DefaultBeanContext.java:2058)
    at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:1095)
    at io.micronaut.context.AbstractBeanDefinition.getBeanForConstructorArgument(AbstractBeanDefinition.java:1007)
    at delivery.core.$MigratorDefinition.build(Unknown Source)
    at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1693)
    at io.micronaut.context.DefaultBeanContext.createAndRegisterSingleton(DefaultBeanContext.java:2402)
    at io.micronaut.context.DefaultBeanContext.getBeanForDefinition(DefaultBeanContext.java:2084)
    at io.micronaut.context.DefaultBeanContext.getBeanInternal(DefaultBeanContext.java:2058)
    at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:623)
    at delivery.core.RunMigrator$Companion.main(RunMigrator.kt:20)
    at delivery.core.RunMigrator.main(RunMigrator.kt)
Caused by: io.micronaut.context.exceptions.NoSuchBeanException: No bean of type [delivery.core.pharmacy.PharmacyRepository] exists. Make sure the bean is not disabled by bean requirements (enable trace logging for 'io.micronaut.context.condition' to check) and if the bean is enabled then ensure the class is declared a bean and annotation processing is enabled (for Java and Kotlin the 'micronaut-inject-java' dependency should be configured as an annotation processor).
Caused by: io.micronaut.context.exceptions.NoSuchBeanException: No bean of type [delivery.core.pharmacy.PharmacyRepository] exists. Make sure the bean is not disabled by bean requirements (enable trace logging for 'io.micronaut.context.condition' to check) and if the bean is enabled then ensure the class is declared a bean and annotation processing is enabled (for Java and Kotlin the 'micronaut-inject-java' dependency should be configured as an annotation processor).

Answer 1

使用 @Repository 注释指定 PharmacyRepository 是一种数据存储库，然后在运行时将其注册为 bean。如果类型是接口或抽象 class 此注释将尝试在编译时自动提供实现。

您还可以扩展 CrudRepository 接口以启用自动生成 CRUD（创建、读取、更新、删除）操作。

例如：

import io.micronaut.data.annotation.*
import io.micronaut.data.model.*
import io.micronaut.data.repository.CrudRepository

@Repository
interface PharmacyRepository extends CrudRepository<YOUR ENTITY HERE, YOUR ENTITY ID HERE> {
}

如果您不想公开所有 CRUD 操作，例如您只允许实体 created/updated 而不是扩展 CrudRepository 您可以扩展 GenericRepository.

另一种选择是使用 PharmacyRepository 的自定义实现，然后向其添加 @Repository 注释。

import io.micronaut.data.annotation.*

interface PharmacyRepository {
    fun createZone(zoneName: String, locationName: String): Zone
}

...

@Repository
class PharmacyRepositoryImpl implements PharmacyRepository {
    // implement declared methods of the interface here
}

参见 Micronaut Guides - Access a database with JPA and Hibernate

的 2.4 存储库访问

线程 "main" io.micronaut.context.exceptions.DependencyInjectionException 中的异常：无法为 class 的参数注入值

Exception in thread "main" io.micronaut.context.exceptions.DependencyInjectionException: Failed to inject value for parameter of class

java

gradle

kotlin

gradle-task

micronaut