Unable to compile code generated using gradle-swagger-generator-plugin - gradle

Question

I am facing a problem that code generated using gradle-swagger-generator-plugin is not compiling due to unresolved dependencies.
I have a multimodule gradle project with the following folder structure. parent is the parent project with three subprojects named modules:apis, modules:api-client, and modules:common
.
├── parent
│   ├── build.gradle
│   ├── gbuild
│   ├── gradle
│   │   └── wrapper
│   │   ├── gradle-wrapper.jar
│   │   └── gradle-wrapper.properties
│   ├── gradle.properties
│   ├── gradlew
│   ├── gradlew.bat
│   ├── modules
│   │   ├── apis
│   │   │   ├── build.gradle.kts
│   │   │   ├── gbuild
│   │   │   └── src
│   │   ├── api-client (generated)
│   │   │   ├── README.md
│   │   │   ├── build.gradle
│   │   │   ├── build.sbt
│   │   │   ├── docs
│   │   │   ├── gbuild
│   │   │   ├── git_push.sh
│   │   │   ├── gradle
│   │   │   ├── gradle.properties
│   │   │   ├── gradlew
│   │   │   ├── gradlew.bat
│   │   │   ├── pom.xml
│   │   │   ├── settings.gradle
│   │   │   └── src
│   │   └── common
│   │   ├── build.gradle.kts
│   │   ├── gbuild
│   │   └── src
│   ├── project_version.properties
│   └── settings.gradle.kts
Module :modules:apis is the spring boot REST service for which I want to generate client SDK. Module :modules:api-client is the placeholder project wherein the client code is generated.
Relevant sections from the modules/apis/build.gradle.kts are as given below.
plugins {
// Some plugins omitted for clarity
java
id("org.springframework.boot")
id("io.spring.dependency-management")
id("org.hidetake.swagger.generator") version "2.18.2"
}
dependencies {
// Other dependencies omitted
implementation (Libs.io_swagger_core)
swaggerCodegen("io.swagger.codegen.v3:swagger-codegen-cli:3.0.27")
}
swaggerSources {
create("testcode") {
// File api-spec is already generated and placed at the right location.
setInputFile(file("$projectDir/src/main/resources/swagger/api-spec.json"))
code(
closureOf<org.hidetake.gradle.swagger.generator.GenerateSwaggerCode> {
wipeOutputDir = true
language = "java"
configFile = file("$projectDir/src/main/resources/swagger/api-config.json")
outputDir = file(
"$rootDir/modules/client"
)
}
)
}
}
tasks.named("build") { dependsOn("generateSwaggerCode") }
What works: I can generate client code using gradle clean build in modules\apis and build it using .\gradle.bat clean build or using gradle clean build in modules\api-client.
What does not work: When I build the parent project using .\gradlew build --no-daemon --stacktrace --info in the parent folder, the task :modules:api-client:compileJava fails with compiler errors only for the first run. Compilation fails because gradle fails to resolve dependencies from modules\api-client\build.gradle. Compiler errors can be found in the attached file.
However, subsequent builds using the same command succeed without problem until modules\api-client folder is deleted manually.
Gradle version used by the parent project
\path\to\parent> .\gradlew.bat --version
------------------------------------------------------------
Gradle 6.7
------------------------------------------------------------
Build time: 2020-10-14 16:13:12 UTC
Revision: 312ba9e0f4f8a02d01854d1ed743b79ed996dfd3
Kotlin: 1.3.72
Groovy: 2.5.12
Ant: Apache Ant(TM) version 1.10.8 compiled on May 10 2020
JVM: 1.8.0_181 (Oracle Corporation 25.181-b13)
OS: Windows 10 10.0 amd64
Gradle version used by :modules:api-client subproject
\path\to\parent\modules\api-client> .\gradlew.bat --version
------------------------------------------------------------
Gradle 2.6
------------------------------------------------------------
Build time: 2015-08-10 13:15:06 UTC
Build number: none
Revision: 233bbf8e47c82f72cb898b3e0a96b85d0aad166e
Groovy: 2.3.10
Ant: Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM: 1.8.0_181 (Oracle Corporation 25.181-b13)
OS: Windows 10 10.0 amd64
I have tried this with all four combinations of options --build-cache and --no-parallel but got the same result. I am relatively new to gradle and took a wild guess that these two options may be playing role in this problem.
Any help in resolving this issue will be highly appreciated.
Thanks
Anand

Answer 1

You should put the generated classes in the buildDir (since you don't want to modifiy them as they get regenerated at each build) and then you need to add the generated class to your sourceSet.
In your build.gradle.kts add this:
configure<SourceSetContainer> {
named("main") {
java.srcDir("$buildDir/generated/src/main/java")
}
}
With the path being the one you specify in your swagger generation task.
Also on my case I set the dependency on the KotlinCompile task:
tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
dependsOn("generateSwaggerCode")
kotlinOptions.jvmTarget = "11"
}
Make sure that this "generateSwaggerCode" does generate the code you need though (./gradlew generateSwaggerCode)