Had one issue with spring data, where I was trying to mock repository.findByIdOrNull, which is an extension function, and I regretted not wrapping spring data repositories in my own interfaces. Is there a best practice for that other than wrapping?

Is there any way to prevent Jackson from de-serializing nulls to non-nullable list, for example I have comments: List<String> and payload comments: [null, null] gives me list of nulls. Or maybe I'm missing something here

Hi! What is the best practice of using

data class

as

Entity

?

I built a POC at hack week at my work this week using KoFu and Flows. I can't wait until this stuff is mainstream 🙂

Hi! Does anyone using a framework with Springboot 2 + Kotlin for feature toggle? I see this https://www.togglz.org, but I found some problems for Kotlin usage…

My group is planning to rebuild our backend service with Spring, and Kotlin seems a good option. So is there any advice?

Or a custom one?

Not sure if this is the correct place, but I have trouble getting ssl to work with a Kotlin Kafka Spring Boot application, using Spring Cloud Kafka Streams. A version using the same keystore and truststore but working with the Kafka Consumer and Kafka Producer does work. Also the ssl specific configurations seems correct from the logging. So it seems it's either Kotlin or Spring that does something different.

Hi everyone, quick question about the spring boot plugin. Is there any particular reason why the

bootJar

task has a dependency on

kaptKotlin

? My understanding is that kapt is needed only for the metadata generation for the ide, am I wrong?

I'm new to Kotlin and trying to figure things out. Do you need to

.registerModule(KotlinModule())

some how to get spring rest controller end points to deserialize the request body?

asking because it doesn’t seem to be, I’m ending up with this ….

Parameter 2 of constructor in com.potreromed.gateway.usecase.InitialFoleySetupApplicationService required a bean of type 'com.potreromed.gateway.model.PatientService' that could not be found.
    Action:
    Consider defining a bean of type 'com.potreromed.gateway.model.PatientService' in your configuration.
`

I'm trying to use spring-boot's configuration meta-data with spring boot 2.1.6 and kotlin: build.gradle.kts

plugins {
	id("org.springframework.boot") version "2.1.6.RELEASE"
	id("io.spring.dependency-management") version "1.0.7.RELEASE"
	val kotlinVersion = "1.3.41"
	kotlin("jvm") version kotlinVersion
	kotlin("plugin.spring") version kotlinVersion
	kotlin("kapt") version kotlinVersion
}
dependencies {
	kapt("org.springframework.boot:spring-boot-configuration-processor")
	implementation(kotlin("reflect"))
	implementation(kotlin("stdlib-jdk8"))
	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
	//...
}

application.yml

security:
  csrfEnabled: true
  token.writer.secret: h2l89efhlwskiehf89o23fhnsldhf89023

usage of

secret

in a class:

@ConfigurationProperties(prefix = "security.token.writer")
class TokenBasedAuthenticationFilter {
	private lateinit var secret: String
	//...

There is no metadata or autocomplete and IntelliJ shows

Cannot resolve configuration property 'security.token.writer.secret'

warning Am I missing something or is it a bug/limitation?

BTW as far as a understand, spring generates a proxy, and catches exceptions coming from methods/classes annotated with

@Transaction

to _commit_/_rollback_ the current transaction. However, I want my service layer to be something like

Either<Error, A>

Hi guys, Has anyone got this gradle error? I haven’t changed the

build.gradle.kts

file, but suddenly the gradle keeps giving me these import errors.

Details: org.gradle.internal.resolve.ArtifactNotFoundException: Could not find spring-context.jar (org.springframework:spring-context:5.2.0.BUILD-SNAPSHOT:20190801.073001-611).
Searched in the following locations:
    <https://repo.spring.io/snapshot/org/springframework/spring-context/5.2.0.BUILD-SNAPSHOT/spring-context-5.2.0.BUILD-20190731.114634-606.jar>

So I looked up the URL, and there is no spring-context-jar file that ends with

20190731

, but only

20190801

. Am I using outdated dependency? Following is my dependencies

dependencies {
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

    implementation("org.springframework.boot:spring-boot-starter-webflux:5.1.7.RELEASE")

    implementation("org.springframework.boot:spring-boot-starter-data-mongodb-reactive")
    implementation("org.mongodb:mongodb-driver-reactivestreams")

    testImplementation("org.springframework.boot:spring-boot-starter-test") {
        exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
        exclude(group = "junit", module = "junit")
    }
    testImplementation("io.projectreactor:reactor-test")
}

Thanks for helping

Is there any best practices to create in Kotlin Mappers between Entities and DTOs and vice versa? Or any should I use mapper libraries like Dozer or MapStruct?

Hello. Can I declare suspending methods in Spring components in the current Spring Boot version (2.1.6)?

While digging deeper into Webflux, Coroutines and Spring Security I found that I can't access the ServerRequests pricinipal:

reqeust.awaitPrincipal()

always returns null. I'm using coRouter and all I do is:

suspend fun categoriesGet(request: ServerRequest): ServerResponse {
       val principal = request.awaitPrincipal()
       println("PRINCIP: $principal")
}

when I use the standard-non-coroutine router I'm getting the expected result:

fun hello(request: ServerRequest): Mono<ServerResponse> {
        return request.principal()
            .map { it.name }
            .flatMap { userName ->
                ok().contentType(MediaType.APPLICATION_JSON)
                    .syncBody("Hello $userName")
            }
    }

is this a bug?

What am I missing?

I may miss something, but with following Java interface:

public interface Expression {

    @Nullable
	Object getValue(EvaluationContext context, Object rootObject) throws EvaluationException;

    @Nullable
	<T> T getValue(EvaluationContext context, @Nullable Class<T> desiredResultType) throws EvaluationException;
}

And following Kotlin code

val value = expression.getValue(context, String::class.java)

, the method used is the first variant, not the second (with IDEA 2019.2 and Kotlin 1.3.41). Why?

I've create a project to reproduce the issue: https://github.com/corneil/spring-spel-kotlin-test

Why can't I use

.value("fieldName", v)

for inserting using fluent API for R2DBC with

v

as nullable

String?

? I have to check for

null

and use

.nullValue("fieldName")

instead. And it ruins the whole purpose of the fluent API. https://docs.spring.io/spring-data/r2dbc/docs/1.0.0.M2/reference/html/#r2dbc.datbaseclient.fluent-api.insert

Hey, I’m new to Spring. In order to get a

DataJpaTest

working I had to add the annotation

@ComponentScan("com.my.package")

to the class. Is this normal? If so, is it documented?

@DataJpaTest
@ComponentScan("com.my.package")
class UserTest @Autowired constructor(
    private val userService: UserService
): AnnotationSpec() {

    @Test fun `Test that findByEmail handles capitalization inconsistencies`() {
        val user = User(email = "mYeMail@gmail.COm", password = "password")
        val persistedUser = userService.createUser(user)
        val email = "MyEmaIL@GMAil.Com"
        val found = userService.find(UserEmailIdentity(email))
        found.email shouldBe persistedUser.email
    }
}

Is there a comprehensive sample project out there with webflux + netty + coroutines out there? I’m having a rough time getting a basic crud example working properly.

Contribution proposal: is there somebody interested to translate Spring Boot code sample to Kotlin like I did on the Spring Framework refdoc? The refdoc is long but there are not so many code samples so I do think it is doable in a reasonable amount of time.

And the asciidoc extension should probably added to https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-docs/pom.xml

Hi, I'm trying to use spring-configuration processor in a library. It does not work. The setup is gradle 5.5.1, kotlin 1.4.50, Spring Boot 2.0.0.M5 To not hog the channel I moved the question to 😒tackoverflow: https://stackoverflow.com/questions/57769464/

@sdeleuze hi, is there any plans to include https://github.com/konrad-kaminski/spring-kotlin-coroutine/blob/master/spring-webflux-kotlin-coroutine/src/main/kotlin/org/springframework/web/server/CoroutineWebFilter.kt into webflux?

We don't change such default version during the development of a minor version of Boot, but yes you can.