Kotlin Spring Boot 注解处理“无法解析配置处理”

Posted 2023-02-27

【中文标题】Kotlin Spring Boot 注解处理“无法解析配置处理”

【英文标题】：Kotlin Spring Boot Annotation Processing "Cannot Resolve Configuration Processing"

【发布时间】：2020-12-29 14:20:57

【问题描述】：

我无法在我的 Kotlin Spring Boot 应用程序中正确注入 @Value 应用程序属性。我的application.yml 文件中定义的属性，随后在additional-spring-configuration-metadata.json 文件（在资源-> META-INF 下）中引用的属性未正确添加到 bean 表达式上下文中。使用IntelliJ version 2020.2.1，当我将鼠标悬停在属性上时，我看到Cannot resolve configuration property 错误。尝试运行应用程序（将配置属性值构造注入到类中）会导致 Unsatisfied dependency expressed through constructor parameter 错误。

build.gradle.kts

plugins 
    id("org.springframework.boot") version "2.3.3.RELEASE"
    id("io.spring.dependency-management") version "1.0.10.RELEASE"
    kotlin("jvm") version "1.3.72"
    kotlin("plugin.spring") version "1.3.72"


group = "com.myProject"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_11

repositories 
    mavenCentral()


extra["springCloudVersion"] = "Hoxton.SR8"

dependencies 
    implementation("org.springframework.boot:spring-boot-starter-webflux")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
    implementation("org.springframework.boot:spring-boot-configuration-processor:2.3.3.RELEASE")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
    testImplementation("org.springframework.boot:spring-boot-starter-test") 
        exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
    
    testImplementation("io.projectreactor:reactor-test")


buildscript 
    repositories 
        mavenCentral()
        jcenter()
    
    dependencies 
        classpath("com.google.cloud.tools:appengine-gradle-plugin:2.2.0")
    


apply(plugin = "com.google.cloud.tools.appengine")

configure<com.google.cloud.tools.gradle.appengine.appyaml.AppEngineAppYamlExtension> 
    deploy 
        projectId = "my-cloud-project"
        version = "GCLOUD_CONFIG"
    


dependencyManagement 
    imports 
        mavenBom("org.springframework.cloud:spring-cloud-dependencies:$property("springCloudVersion")")
    


tasks.withType<Test> 
    useJUnitPlatform()


tasks.withType<KotlinCompile> 
    kotlinOptions 
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "11"
    

错误信息 Spring error modal

附加弹簧配置-metadata.json

  "properties": [
    
      "name": "otherApi.baseUrl",
      "type": "java.lang.String",
      "description": "Description for otherApi.baseUrl."
    
  ]

我添加了注释处理依赖项，使缓存无效并重新启动，并使用了 Kotlin 特定的注释处理器 (kapt)。我也按照这里的说明进行操作：https://www.jetbrains.com/help/idea/annotation-processors-support.html

我错过了什么？任何和所有的帮助将不胜感激。谢谢！

【参考方案1】：

您需要将以下内容声明为annoatationProcessor

implementation("org.springframework.boot:spring-boot-configuration-processor:2.3.3.RELEASE")

到

annotationProcessor("org.springframework.boot:spring-boot-configuration-processor:2.3.3.RELEASE")

【讨论】：

我试过了，还是不行。但这是一个很好的建议，所以谢谢！我确实认为这对我的 Kotlin 项目来说确实非常挑剔。我会继续玩

【参考方案2】：

如果您的application.yml（或application.properties）看起来像这样：

spring:
    datasource:
        username: postgres
        password: postgres
        url: jdbc:postgresql://localhost:5433/company
        driver-class-name: org.postgresql.Driver

然后尝试将每个属性重写为每个属性的全名格式：

spring.datasource.username: postgres
spring.datasource.password: postgres
spring.datasource.url: jdbc:postgresql://localhost:5433/company
spring.datasource.driver-class-name: org.postgresql.Driver