[BUG][JavaSpring] Suppress unused import warnings

[Service84Tyler]

Bug Report Checklist

• [x] Have you provided a full/minimal spec to reproduce the issue?
• [x] Have you validated the input using an OpenAPI validator (example)?
• [x] Have you tested with the latest master to confirm the issue still exists?
• [x] Have you searched for related issues/PRs?
• [x] What's the actual output vs expected output?
• [ ] [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The files generated from JavaSpring api.mustache, apiController.mustache, apiDelegate.mustache, and model.mustache have unused imports. I generate the API stubs on compile so I can't manually remove unused imports, because they will just come back on the next compile. I am also using STS/eclipse and I am striving for a spotless build so the unused import warnings are a nuisance and potentially hide important warnings.

openapi-generator version

I am using 4.2.3, and 6.0, This also appears in master. I don't believe this is a regression

Version 6.0.0 Generator: spring Library: spring-boot Gradle: 6.9 Java version: 11

OpenAPI declaration file content or url

https://petstore.swagger.io/v2/swagger.json

Generation Details

plugins {
  id 'org.springframework.boot' version '2.7.0'
  id 'io.spring.dependency-management' version '1.0.9.RELEASE'
  id 'org.openapi.generator' version '6.0.0'
  id 'java'
}

apply plugin: 'java'

def jarName = 'petstore-service'
def version = '0.5.0-SNAPSHOT'
def coreName = jarName.split('-')[0]

jar {
  archiveBaseName = jarName
  archiveVersion = version
  enabled = true
}

sourceCompatibility = 11.0

sourceSets {
  main {
    java {
      srcDir 'gen/main/java'
    }
  }
}

repositories {
  mavenLocal()
  mavenCentral()
}

configurations.all {
  exclude module: 'slf4j-jdk14'
}

dependencies {
  implementation 'org.springframework.boot:spring-boot-starter-web'

  implementation 'org.openapitools:jackson-databind-nullable:0.2.2'
  implementation 'org.springdoc:springdoc-openapi-ui:1.6.8'

  ////////////////////////////////
  //Test Dependencies/////////////
  ////////////////////////////////
  testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

test {
  useJUnitPlatform()
}

////////////////////////////////
//API Stubs/////////////////////
////////////////////////////////
task deleteAPIStubs(type: Delete) {
  delete "gen/main/java/io/service84/services/${coreName}"
}

task generateAPIStubs(type: org.openapitools.generator.gradle.plugin.tasks.GenerateTask) {
  inputSpec = "$rootDir/src/main/resources/${coreName}.yaml"
  outputDir = "$rootDir"
  generatorName = 'spring'
  library = 'spring-boot'
  apiPackage = "io.service84.services.${coreName}.api"
  modelPackage = "io.service84.services.${coreName}.dto"
  modelNameSuffix = 'DTO'
  configOptions = [
    delegatePattern: 'True',
    useTags: 'True',
    hideGenerationTimestamp: 'True',
    dateLibrary: 'java8',
    sourceFolder: 'gen/main/java'
  ]
  typeMappings = [
    OffsetDateTime: 'java.time.LocalDateTime'
  ]
}

generateAPIStubs.dependsOn deleteAPIStubs

compileJava.dependsOn generateAPIStubs

Then import into STS/eclipse and you will see the many unused import warnings

Related issues/PRs

I will propose with the suggested fix

12578

Suggest a fix

Add @SuppressWarnings(value = {"unused"})

[Service84Tyler]

The expected output is to generate files that do not cause IDE warnings The actual output is java files that include unused imports which cause IDE warnings

[foxpluto]

I bump the issue, so many warning make the code really difficult to read.

Regards, S.

[FieteO]

I gave the problem a shot in #13650 and #13582 but encountered some edge cases