I’m using the OpenAPI generator to auto-generate Java classes in SpringBoot from an OpenAPI specification. As build tool, I’m using Gradle.

I managed to create the classes which can be found in the path build/generate-resources/src/main/java, but somehow, despite adding this path as source set in build.gradle, my IDE (Intellij) still doesn’t recognize them and doesn’t suggest them to me when I start typing the names of the generated classes.

I checked other posts and articles such as here and here, but can’t spot the error in my code:

plugins {
    id "java"
    id "org.springframework.boot" version "3.2.4"
    id "io.spring.dependency-management" version "1.1.4"
    id "org.openapi.generator" version "7.5.0"
}

group = "com.example"
version = "0.0.1-SNAPSHOT"

java {
    sourceCompatibility = "17"
}

repositories {
    mavenCentral()
}

dependencies {
    implementation "org.springframework.boot:spring-boot-starter-web"
    testImplementation "org.springframework.boot:spring-boot-starter-test"
}

openApiGenerate {
    generatorName.set("java")
    inputSpec = "$rootDir/specs/example-api.yaml"
    outputDir = "$buildDir/generate-resources"
    apiPackage = "com.example.demo"
    modelPackage = "com.example.demo.model"
    configOptions = [
            library        : "resttemplate",
            openApiNullable: "false",
            useJakartaEe   : "true"
    ]
}

sourceSets {
    main {
        java {
            srcDir("$buildDir/generate-resources/src/main/java")
        }
    }
}

tasks.compileJava {
    dependsOn(tasks.openApiGenerate)
}

tasks.named("test") {
    useJUnitPlatform()
}