Is it a good pratice to create a kafka topic with Spring, or is creating using the CLI better?

I've just noticed this example in Spring docs:

class PersonForm(
    @get:NotNull @get:Size(max=64)
    private val name: String,
    @get:Min(0)
    private val age: Int
)

Does this mean that we can finally use non-nullable properties in validated pojos and still get a nice validation error instead of kotlin's null passed into non-nullable property?

How do I specify a Kotlin function as the

mainClassName

in the

springBoot

section of the build.gradle.kts? (The rest of the details in the thread)

This message was deleted.

How will the Spring DI Container create TriggerScheduler? You have a parameter 

val scheduledTriggerExecutors: List<ScheduledTriggerExecutor>

 and I don't know how the DI is going to resolve that? You will need to remove @Component from TriggerScheduler and have an @Bean method in a @Configuration class to create this. Then it should behave as expected

Hi everyone. What could be a way to test a service that uses

WebClient

to perform requests ? Mocking

WebClient

does not seem to be a viable solution. I've seen something like

WebClientTest

on the web, but I'm unable to find the correct dependency or documentation about it.

Is it possible to use Moshi to handle json in Spring Boot instead of Jackson or Gson?

hello! I'm looking into implementing some integration tests that require starting up the SpringBoot app, running some tests (through a plugin) and shutting down the app through Gradle. Maven has a built-in support for that (i.e.

start

and

stop

goals https://docs.spring.io/spring-boot/docs/current/maven-plugin/usage.html). Based on https://github.com/spring-projects/spring-boot/issues/3982 and https://github.com/gradle/gradle/issues/1367 looks like there is no out of the box solution for that. Guess this could be done through the custom tasks that rely on Spring Actutator (as suggested here -> https://stackoverflow.com/questions/31407323/running-integration-tests-for-a-spring-boot-rest-service-using-gradle). Any suggestions?

bit random, does anyone know what % of spring initializr projects are built with kotlin as a language ? (we're doing a talk for a Kotlin User Group)

what's the common way to test

suspend

functions in Tests?

runBlockingTest {..}

from kotlinx-coroutines-test or is there some spring equivalent?

Spring 2.2.x folks .. was it just a bootiful dream that one could use Constructor Injection in Junit5 Tests with SpringExtension? 🤔 🍃

How would you do the following with Kotlin, Spring WebFlux + Kotlin Coroutines in a reactive Way: - Extract body (json) from ServerRequest. - Load a (template) ClassPathResource (json) , do String replacements with values extracted from the request? - Would a

Mono

be sufficient with a single map operation on the whole string? - Under the assumption it’s not a

ClassPathResource

but some expensive DiskIO: Would it make sense to Tokenize the File to a

Flux/Flow<String>

What’s the usual Spring/Kotlin/Webflux object to use to intercept incoming reqests to check headers?

what is the difference between

bootJar

and

shadowJar

. Can I use

shadowJar

for Spring boot applications?

hi, I am using Spring Data JPA and creating some entities. I have the kotlin jpa plugin installed in Gradle so it should be making no-arg constructors for my entities. But I still get the error below in IntelliJ. Is there a project setting I need to change so IntelliJ recognizes I'm using the kotlin jpa plugin?

Hi, I am writing a Spring Boot Kotlin micro service. I intend to use spring reactive stack along with Kotlin Flows/Coroutines. I want to log all incoming http request and response body in my micro service. What would be an appropriate approach to do that? Is writing a Filter which intercepts the request/response and reads the stream and then log it is safe and recommended? What other options I can explore? Thanks in advance

and now that you are using everything explicit, you need to... no magic anymore, that’s the trade-off no magic means no instantiation of beans behind your back you need to declare everything by yourself

This will fail to start with:

Description:
A component required a bean of type 'java.util.List' that could not be found.
Action:
Consider defining a bean of type 'java.util.List' in your configuration.

Why is that? Doesn't collection autowiring work with Spring Fu?

what is more preferred? Spring AOP logging or logging using lambdas?

Hi everyone. Coming from Java and trying to understand how to use

@JsonDeserializer

and

@JsonSerializer

. By now all that have discovered is that Kotlin uses

jackson-module-kotlin

without any success though. Thanks for reading and helping this fellow software engineer.

Is there a way to set client id + secret for OAuth2 at runtime for WebClient?

I'm trying out bean & router DSLs:

@SpringBootApplication
class DemoApplication

fun main(args: Array<String>) {
    runApplication<DemoApplication>(*args) {
        beans {
            bean {
                router {
                    GET("hi") { ok().body("hi") }
                }
            }
        }
    }
}

But I get 404 on

localhost:8080/hi

, am I missing something?

@sdeleuze I have an issue when using Web.Fn my metrics per route are not properly showing up in my actuator endpoint. I have this route defined: https://github.com/soudmaijer/spring-webfn-metrics/blob/master/src/main/kotlin/nl/sourcelabs/prometheus/demo/DemoApplication.kt#L31 but in the output of my metrics the path disappears and just displays: root. https://github.com/soudmaijer/spring-webfn-metrics/blob/master/actuator_output.txt#L5 When I convert it back to a @RestController all works fine again. Any ideas?

How to solve this? It can actually run without any problem

Not sure if #spring or #coroutines: It only fails on certain environments

- Kotlin + Depencendices: "1.3.61" - coroutines 1.3.+
- Spring Boot 2.2.4.RELEASE

2020-03-06 12:29:59.485 ERROR 28 --- [boundedElastic-5] reactor.core.scheduler.Schedulers        : Scheduler worker in group main failed with an uncaught exception
java.lang.NoClassDefFoundError: kotlin/coroutines/AbstractCoroutineContextKey
	at java.lang.ClassLoader.defineClass1(Native Method)

Hey guys, is there any alternative to Spring-retry? It doesn't seem to be maintained anymore, and some of the things I need aren't possible to do with it (example a bean with the default retrytemplate)

Hello, I am using reactive spring. Does anyone know how to put file inside

ServerResponse

? I’m creating excel file by

poi

and I can’t find way to put this file inside ServerResponse

is updating to kotlin 1.3.70 planned for boot 2.3 or is 1.3.61 final?