I just expected it to also work with

Boolean

but that would be too much magic

hi there, I'm having a very strange issue with my spring boot 2 test project: when I perform a GET request it works fine, but on POST it always throws a 401 with plain text

CSRF Token has been associated to this client

... any ideas?

I have a batch job I’m working on. I have my processor returning a

Pair

, and a

CompositeItemWriter

that sends half the pair to each of two individual writers. But if something goes wrong, I only want to write to one: normally you can return null from a processor and nothing gets written, but if I return

Pair(object1, null)

, then the writer that receives the null gives me a

Target object must not be null

. Am I approaching this the wrong way, or is there a way around this?

my apologies for not having seen it

Before I spend a bunch of time on a pullrequest... Is it a terrible idea to declare a generated ID as a

lateinit var

in a JPA entity? Right now it fails, because Spring Data's

isNew

check accesses the ID and expects null, this could be patched to allow for

lateinit

. Is that a good idea?

Is it possible to implement a server that responds both HTTP calls and WebSockets using

router { }

block? I've been developing an API without Spring annotations but couldn't understand how to wire them. Here is my last attempt: https://github.com/lucasvalenteds/responder/commit/1e4714304b0a24d59a55e36770b476c954b2dee1

How to make the Main thread wait until the Flux has completed all its feed

@Test
    fun testFnCall_partyAddrByCleanCd() {
        println("\n\n\n\n ---------------- SEE MEE START  ----------------------")
        val start = System.currentTimeMillis()
        val res = ecmDbSvc.callFnGetPartyAddrByExtCleanCd("ECM-123")
        assert(res != null)
        assertTrue(res.count() == 100)
        val fluxOfPartyAddr = Flux.fromIterable(res)
                .delayElements(Duration.ofMillis(100))
                .parallel(4).runOn(Schedulers.parallel())
                .doOnNext { e -> println(e.addrLine1) }

        // fluxOfPartyAddr.blockLast()  --> Invalid when using parallel
        fluxOfPartyAddr.doOnComplete {
            val end = System.currentTimeMillis()
            println("time talen: " + (end - start) + " milliSeconds")
            println("---------------- SEE MEE START COMPLETE ----------------------")

        }

        fluxOfPartyAddr.subscribe()
        //        ??? anything here to make the thread wait ???

    }

The right link for the kapt issue is in fact https://youtrack.jetbrains.com/issue/KT-15040#comment=27-2840615

Considering mbogdanov's comment on the issue, should Spring be updated to support kotlin 1.2.40? https://youtrack.jetbrains.com/issue/KT-23973

Thanks, tried that & ended up with different errors, think I have created a sort of hybrid Unit Test. Will probably just go with the manual creation of the MockMvc for the time being as it allows me to test the controller interface whilst mocking out the backing services.

@Michael Thank's, I'll give it another shot on my commute home tonight

Hey guys, just trying out spring in kotlin and I followed the guides / start.spring.io but I always get told that Application is final, even though I have the allopen plugin.

I also tried by myself with the tutorial from jetbrains: https://kotlinlang.org/docs/tutorials/spring-boot-restful.html

Has anyone ever run in to

No Beans of TestRestTemplate found

? According to the testing guide, if you provide a local port then it should automatically wire it up for you. https://spring.io/guides/gs/testing-web/ For whatever reason that’s not happening.

Hey, here is a first draft version of the Spring Boot 2 + Kotlin tuto I will publish on spring.io. I still need to fix typos, polish the code, write the chapter on

@ConfigurationProperties

, etc. but I would appreciate some early feedback, and eventually some improvements via PR (typos, sentences improvements since I am not native english speaker, etc.). I will start working on the WebFlux + functional API + reactive MongoDB + WebTestClient one next week. Thanks and have a good weekend. https://github.com/sdeleuze/tut-spring-boot-kotlin

Please do not share it yet, the repo address will change.

Are there any common things to watch out for when wiring Properties from a yml file in kotlin?

Good morning everyone. I need a help from you guys. I'm developing a service using Kotlin and Spring with MySQL database, and Spring JPA, in my service I have some custom queries in my database like this one:

@Modifying
    @Transactional
    @Query("DELETE FROM CollectionComicBook WHERE comic_book_id = ?1")
    fun deleteByComicBookId(comicBookId: Long): Int

When I run this query it works ok, I can see in my database that the value is being deleted, however my service return this error:

"Modifying queries can only use void or int/Integer as return type!; nested exception is java.lang.IllegalArgumentException: Modifying queries can only use void or int/Integer as return type!

I've tried to change the return type to Long, Integer (from java), Unit and also leave it blank, but I'm still getting this error. I don't know what I can do to solve this. Anyone can help me with this?

I am almost done with my Spring Boot 2 + Kotlin + JPA tuto, feedback and fixes (via PR) welcome https://github.com/sdeleuze/tut-spring-boot-kotlin

I’ve got some compiler warnings of

Kotlin: Expected type does not accept nulls in Java, but the value may be null in Kotlin

around a

MapSqlParameterSource("key", null)

- but the value can be null, as far as I can tell.

you can make it a bean dependency 🙂

what is the slack channel for Spring Reactor

I applied the all-open plugin , but still I get the error

Caused by: java.lang.IllegalArgumentException: Cannot subclass final class com.winsupply.ecm.job.infa.mdm.EcmBulkCleanUserId

fun updateUserIdDefault(cbPartyXref: CBPartyXref): String {...}

==> this one need to be called from the above

I’m trying to actually use an immutable pojo in my spring project, and I have

jackson-module-kotlin

in my pom dependencies. When I run my

NamedParameterJdbcTemplate

with a

BeanPropertyRowMapper

, though, it’s throwing

Illegal arguments for constructor; nested exception is java.lang.IllegalArgumentException: No argument provided for a required parameter: parameter #0

. What might I be missing?

Hi, I just upgraded from Spring Boot 1.5.9 to 2.0.2 and Spring can no longer create instances of my private components. The following worked in 1.5.9:

@Component
private class ActivityRepositoryImpl(private val dbCursor: DbCursor) {
	...
}

After upgrading Spring greets me with the following stacktrace:

Caused by: java.lang.IllegalAccessException: Class kotlin.reflect.jvm.internal.FunctionCaller$Constructor can not access a member of class com.trireduce.persistence.ActivityRepositoryImpl with modifiers "public"
        at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:102) ~[?:1.8.0_112]
        at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:296) ~[?:1.8.0_112]
        at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:288) ~[?:1.8.0_112]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:413) ~[?:1.8.0_112]
        at kotlin.reflect.jvm.internal.FunctionCaller$Constructor.call(FunctionCaller.kt:66) ~[kotlin-reflect-1.2.41.jar:1.2.41-release-74 (1.2.41)]
        at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:107) ~[kotlin-reflect-1.2.41.jar:1.2.41-release-74 (1.2.41)]
        at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod(KCallableImpl.kt:149) ~[kotlin-reflect-1.2.41.jar:1.2.41-release-74 (1.2.41)]
        at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:111) ~[kotlin-reflect-1.2.41.jar:1.2.41-release-74 (1.2.41)]
        at org.springframework.beans.BeanUtils$KotlinDelegate.instantiateClass(BeanUtils.java:765) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
        at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:170) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
        at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:271) ~[spring-beans-5.0.6.RELEASE.jar:5.0.6.RELEASE]
        ... 22 more

Does anybody have an idea how to solve this?

spring experts : I forked the project (simple spring boot kotlin) by @sdeleuze... and all I did is rearrange the @Configuration classes, the HttpApiTests are failing, can you please take a look, thank you https://github.com/visakha/tut-spring-boot-kotlin.git

junit5 spring kotlin - I get the error

java.lang.Exception: Test class should have exactly one public zero-argument constructor

	at org.junit.runners.BlockJUnit4ClassRunner.validateZeroArgConstructor(BlockJUnit4ClassRunner.java:171)
	at org.junit.runners.BlockJUnit4ClassRunner.validateConstructor(BlockJUnit4ClassRunner.java:148)
	at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:127)
	at org.junit.runners.ParentRunner.validate(ParentRunner.java:416)
	at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84)
	at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
	at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)