Spring Boot 3.x升级。无法解析 org.springframework.boot:spring-boot-gradle-plugin:3.0.1

我最近想把我的kotlin项目从spring boot 2.7.x升级到3.0.1。我使用Java 17 temurin，gradle 7.6。在IntelliJ中，我在通过gradle导入项目时得到了以下错误信息：

A problem occurred configuring root project 'demo'.
> Could not resolve all files for configuration ':classpath'.
   > Could not resolve org.springframework.boot:spring-boot-gradle-plugin:3.0.1.
     Required by:
         project : > org.springframework.boot:org.springframework.boot.gradle.plugin:3.0.1
      > No matching variant of org.springframework.boot:spring-boot-gradle-plugin:3.0.1 was found. The consumer was configured to find a runtime of a library compatible with Java 11, packaged as a jar, and its dependencies declared externally, as well as attribute 'org.gradle.plugin.api-version' with value '7.6' but:
          - Variant 'apiElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.1 declares a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares an API of a component compatible with Java 17 and the consumer needed a runtime of a component compatible with Java 11
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'javadocElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.1 declares a runtime of a component, and its dependencies declared externally:
              - Incompatible because this component declares documentation and the consumer needed a library
              - Other compatible attributes:
                  - Doesn't say anything about its target Java version (required compatibility with Java 11)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'mavenOptionalApiElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.1 declares a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares an API of a component compatible with Java 17 and the consumer needed a runtime of a component compatible with Java 11
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'mavenOptionalRuntimeElements' capability org.springframework.boot:spring-boot-gradle-plugin-maven-optional:3.0.1 declares a runtime of a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component compatible with Java 17 and the consumer needed a component compatible with Java 11
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'runtimeElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.1 declares a runtime of a library, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares a component compatible with Java 17 and the consumer needed a component compatible with Java 11
              - Other compatible attribute:
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')
          - Variant 'sourcesElements' capability org.springframework.boot:spring-boot-gradle-plugin:3.0.1 declares a runtime of a component, and its dependencies declared externally:
              - Incompatible because this component declares documentation and the consumer needed a library
              - Other compatible attributes:
                  - Doesn't say anything about its target Java version (required compatibility with Java 11)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Doesn't say anything about org.gradle.plugin.api-version (required '7.6')

我也尝试从start.spring.io下载一个类似的项目骨架。通过下面的build.gradle.kts：

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    id("org.springframework.boot") version "3.0.1"
    id("io.spring.dependency-management") version "1.1.0"
    kotlin("jvm") version "1.7.22"
    kotlin("plugin.spring") version "1.7.22"
}

group = "com.example"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_17

repositories {
    mavenCentral()
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "17"
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
}

但在导入程序时的错误信息仍然是一样的。有什么想法吗？

我看到你在用IntelliJ IDEA做这个。这是对我有用的方法：进入settings--> Build, Execution, Deployment --> Build Tools --> Gradle。在'Gradle项目'下点击你的gradle项目。为项目选择你的Gradle JVM......在我的例子中，它是openjdk-19。现在它应该可以工作了。

Spring Boot 3.0 要求使用 Java 17。请阅读此博客，以了解更多信息。

似乎springboot 3.0.1有问题，一旦你降级到2.7.1，gradle就能很好地构建。

就像你用的是样本项目一样，只需尝试改变你的gradle文件，如下所示：

plugins {
id 'java'
id 'org.springframework.boot' version '2.7.1'
id 'io.spring.dependency-management' version '1.1.0'}

试着将java插件的版本设置为以下内容：

 subprojects {
  apply plugin: "java"
  apply plugin: "groovy"
  apply plugin: 'idea'

  group project.parent.group
  version project.parent.version
  sourceCompatibility = 17
  targetCompatibility =17

另外，你可以通过进入File -> Project Structure -> Project Settings - Project来检查你所使用的java版本是否是项目所要求的版本。