【问题标题】:Kotlin Spring Boot Annotation Processing "Cannot Resolve Configuration Processing"Kotlin Spring Boot 注解处理“无法解析配置处理”
【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!

【问题讨论】:

    标签: spring-boot kotlin gradle intellij-idea annotation-processing


    【解决方案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
    【解决方案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
    

    【讨论】:

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