Spring boot - Cannot subclass final class - spring-boot

Question

I'm writing a back end in spring boot. I'm not sure if I've updated a package or what but after a few months of dev, suddenly I got this error on some of my controllers:
Error creating bean with name 'authApi' defined in file ... Cannot subclass final class
I've googled it and found some explanations of why Spring Boot need classes to be open so I was ready to mark all my classes as open but then my auto-wired constructor parameters and properties initialised in place are all null.
Here is an example controller:
#RestController
#RequestMapping("/api")
open class AuthApi(
private val userManager: UserManager,
private val authenticationManager: AuthenticationManager,
private val jwtEncoder: JwtEncoder
){
val logger = LoggerFactory.getLogger(AuthApi::class.java)
}
Here are my Gradle files. The issue appeared after I've updated the two submodule's Gradle files to disable bootJar. I'm not sure how that could affect the situation but maybe I've cleared some kind of cache and "triggered" an issue I've caused earlyer
Main:
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
import com.github.gradle.node.yarn.task.YarnTask
buildscript{
repositories {
maven {
url = uri("https://plugins.gradle.org/m2/")
}
}
dependencies{
classpath("com.github.node-gradle:gradle-node-plugin:3.2.1")
}
}
plugins {
id("org.springframework.boot") version "2.7.8"
id("io.spring.dependency-management") version "1.1.0"
kotlin("jvm") version "1.6.10"
kotlin("plugin.spring") version "1.6.10"
kotlin("plugin.jpa") version "1.5.21"
id("com.github.node-gradle.node") version "3.2.1"
}
allprojects {
apply(plugin = "io.spring.dependency-management")
apply(plugin = "org.springframework.boot")
apply(plugin = "com.github.node-gradle.node")
apply(plugin = "java")
apply(plugin = "kotlin")
group = "com.test"
version = "0.9.0"
java.sourceCompatibility = JavaVersion.VERSION_17
repositories {
mavenCentral()
}
}
subprojects {
apply(plugin = "java")
apply(plugin = "kotlin")
apply(plugin="io.spring.dependency-management")
}
tasks.withType<KotlinCompile> {
kotlinOptions {
freeCompilerArgs = listOf("-Xjsr305=strict")
jvmTarget = "17"
}
}
tasks.withType<Test> {
useJUnitPlatform()
}
dependencies {
implementation("com.google.cloud:spring-cloud-gcp-dependencies:3.4.3")
implementation("com.google.cloud.sql:mysql-socket-factory:1.9.0")
implementation("com.google.cloud:google-cloud-storage:2.17.2")
implementation("org.springframework.cloud:spring-cloud-gcp-starter-sql-mysql:1.2.8.RELEASE")
implementation("org.springframework.boot:spring-boot-starter-actuator:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-security:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-data-jdbc:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-data-rest:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-data-jpa:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-web:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-thymeleaf:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-validation:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-batch:2.7.8")
implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.13.3")
implementation("org.springframework.boot:spring-boot-starter-validation:2.7.8")
implementation("org.jetbrains.kotlin:kotlin-reflect")
implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
runtimeOnly("com.h2database:h2:2.1.214")
implementation("org.hibernate.validator:hibernate-validator:7.0.5.Final")
runtimeOnly("mysql:mysql-connector-java:8.0.30")
implementation("com.google.zxing:core:3.5.0")
implementation("com.google.zxing:javase:3.5.0")
implementation("org.apache.commons:commons-csv:1.9.0")
implementation(project(":authentication"))
implementation(project(":commerce"))
testImplementation("org.springframework.boot:spring-boot-starter-test:3.0.2")
testImplementation(kotlin("test"))
}
Module 1
import org.springframework.boot.gradle.tasks.bundling.BootJar
tasks.getByName<BootJar>("bootJar") {
enabled = false
}
tasks.getByName<Jar>("jar") {
enabled = true
}
dependencies {
implementation("org.springframework.boot:spring-boot-starter-data-rest:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-security:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-data-jpa:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-data-jdbc:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-web:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-oauth2-resource-server:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-mail:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-thymeleaf:2.7.8")
implementation("com.nimbusds:nimbus-jose-jwt:9.23")
implementation("com.google.api-client:google-api-client-java6:2.0.0")
}
Module 2
import org.springframework.boot.gradle.tasks.bundling.BootJar
tasks.getByName<BootJar>("bootJar") {
enabled = false
}
tasks.getByName<Jar>("jar") {
enabled = true
}
dependencies {
implementation("org.springframework.boot:spring-boot-starter-data-rest:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-web:2.7.8")
implementation("org.springframework.boot:spring-boot-starter-data-jpa:2.7.8")
implementation("com.stripe:stripe-java:21.2.0")
implementation("org.springframework.boot:spring-boot-starter-security:2.7.8")
}
Edit 2:
Looking at the debugger, I've found that the original object has all the properties, seems like when I use userManager for example in an endpoint, it is accessing the proxy's property or something instead of the original one.