kotlinlang #spring

https://spring.io/guides/gs/multi-module/ Spring library can't be built in an MPP project targeting android, ios and jvm(java 8), is it the intended behavior?

nfrankel

01/29/2019, 7:58 AM

any idea how i could make delegated properties in kotlin work with jpa?

Czar

01/29/2019, 12:55 PM

is there a way to get a hold of

InjectionPoint

in SpringFu kofu bean definition DSL?

reik.schatz

02/07/2019, 3:07 PM

@Component
interface EventTransformer<T> where T: Event { ..

@Component
class LoginEventTransformer: EventTransformer<Login> { 

@Component
class FieldValueListRowMapper(transformers: List<EventTransformer<Event>>) { // autowires empty list

alieksie

02/11/2019, 11:17 AM

Hi Spring channel! I am having issue, building ReactiveEndpoint:

@PostMapping(SEARCH_ROUTE)
fun search(@RequestBody searchQuery: SearchQuery): Mono<SearchQuery> = searchService.save(searchQuery)

save(searchQuery)

returns Mono<SearchQuery>. When i return Mono.just(searchQuery), there are no issues. But when i return

someMono.flatMap { ... }

I am getting an error:

...SearchQuery cannot be cast to class java.lang.String

Are there any tricks, or i miss something, when i use

.flatMap

? 🙂

bjonnh

02/12/2019, 7:18 PM

I'm getting an error in IntelliJ saying that it cannot autowire because no Beans of type RoleRepository exist (I'm using :

@Autowired
    private var roleRepository: RoleRepository? = null

The application works properly, is there anything I can do about that?

sdeleuze

02/13/2019, 9:22 AM

For Spring Boot: https://gitter.im/spring-projects/spring-boot

sdeleuze

02/13/2019, 4:01 PM

https://twitter.com/sdeleuze/status/1095710763778535424

sdeleuze

02/13/2019, 4:01 PM

https://twitter.com/sdeleuze/status/1095714310712709120

snowe

02/14/2019, 10:18 PM

-.txt

varpa89

02/15/2019, 1:50 PM

@sdeleuze can we use scheduling in spring-fu. I don't understand how to declare it instead of @enablescheduling annotation

sdeleuze

02/15/2019, 2:58 PM

https://twitter.com/sdeleuze/status/1096423498325651459

❤️ 6

Ivan Feliciano

02/17/2019, 2:32 AM

Anybody here got spring-boot-configuration-processor working with kapt?

sdeleuze

02/18/2019, 1:38 PM

https://kotlinlang.slack.com/archives/C0BJ0GTE2/p1550497039044300

👏🏾 3

🎉 6

👍 2

Steven McLaughlin

02/18/2019, 2:12 PM

This may be a stupid question. It seems like the spring folks seem to like kotlin quite a bit. What is the roadmap with respect to kotlin? Is the idea to take advantage of kotlin under the hood and allow users to do whatever they want with that? Is the idea for it to be more first-class support for kotlin? I saw there were the jafu and kofu things both being developed. In say a year or two, do you anticipate a lot of users starting new spring projects to be using kotlin, or do you expect that most people will still be using java?

bjonnh

02/25/2019, 9:38 PM

Is that the correct way to catch all /doi/<variable> where variable can be 10.10/foo

thanksforallthefish

03/01/2019, 12:02 PM

crossposting, https://kotlinlang.slack.com/archives/C0B8MA7FA/p1551432870022200 the conclusion seems to be that while the interface declares (if we consider javadocs a declaration) the

value

parameter as nullable (https://github.com/spring-projects/spring-hateoas/blob/master/src/main/java/org/springframework/hateoas/server/mvc/UriComponentsContributor.java#L46) spring data commons declares the implementation (

HateoasSortHandlerMethodArgumentResolver

) as not nullable, therefore kotlin prevents to write something like

override fun enhance(builder: UriComponentsBuilder, parameter: MethodParameter, value: Any?)

. is it worth to create an issue?

sdeleuze

03/05/2019, 10:30 AM

https://twitter.com/sdeleuze/status/1102878532680777728

👍 1

Czar

03/05/2019, 12:52 PM

Gotta love websites which do not specify colours, relying on the OS defaults but forgetting the level of customizability of the OS UI.

sdeleuze

03/06/2019, 10:28 AM

You may have a good surprise in upcoming Spring Boot 2.2 M1 which is just around the corner 😉

❓ 4

:kotlin: 8

🤘 1

🤩 2

bulbulpaul

03/07/2019, 4:47 PM

I’m converting from annotation based app to DSL based app.

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY, AnnotationTarget.VALUE_PARAMETER, AnnotationTarget.CLASS, AnnotationTarget.FIELD)
@Retention(AnnotationRetention.RUNTIME)
@Inherited
@Qualifier
annotation class Extra

If there are multiple beans implementing the same interface, we used the Annotation class using the above @Qualifier. This time, I think that there are the following methods when it comes to describing it in Bean DSL. a: Define it as ref<>() where necessary in the Bean DSL. b: Specify with @Qualifier during constructor injection If you know other one how to implement it, please let tell me...😅

poohbar

03/08/2019, 7:58 PM

I upgraded from Spring Boot 2.0.6 to 2.1.3 and now my test beans defined in mockk suddenly stopped working.

Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class com.example.core.feature.general.MyService$ByteBuddy$XNiBjGz8$ByteBuddy$rk2gOXmp: Common causes of this problem include using a final class or a non-visible class; nested exception is org.springframework.cglib.core.CodeGenerationException: java.lang.NoClassDefFoundError-->com/example/core/feature/general/MyService$ByteBuddy$XNiBjGz8$ByteBuddy$rk2gOXmp

I found this: https://github.com/raphw/byte-buddy/issues/486 Could it be somehow related to ByteBuddy? I know that Spring Boot now supports Java 11 for the first time. This is how I define my test mocks.. used to work perfectly:

@Bean
fun myService() = mockk<MyService>(relaxed = true)

reik.schatz

03/11/2019, 10:01 AM

@Value("\${test.user.count.under.test:6}")
    var testUserCountUnderTest: Int = 6

Jonas Bark

03/15/2019, 2:16 PM

Regarding https://github.com/spring-projects/spring-fu/issues/16: We're trying to use the spring-security module but as we're using the functional approach using spring-fu there's no way to use @EnableWebFluxSecurity annotation. Is that correct? Is there a way support both, functional and annotation based processing? The functional approach worked great so far so it would be a real bummer if there's no way to make it work right now.

oleksiyp

03/15/2019, 10:33 PM

@sdeleuze I am wondering if there will be ever STOMP library based on Reactor in Spring. I've done some prototyping and seems Reactor is not the best option for dynamic subscriptions. Particularly there are not many processors that can be used and all have some pros and cons(more cons). I can talk in more detail about it, but my prototype failed. It didn't pass the test of repetitive subscription/unsubscription with 100 ms delay to receive messages. I tried many different approaches while trying to pass this test, fixed memory leaks, thread leak, but at some point, with the best implementation that I could achieve messages anyway just stop coming. Then I tried to do a prototype using coroutines and it was developed a lot faster and passed many different tests without problems. As a plus related to structured concurrency you can have a supervisor job associated with a subscription that finishes everything that was launched per subscription, per destination, per transaction, e.t.c. So the question is what are plans about STOMP in this regard?

lex

03/18/2019, 3:53 AM

@sdeleuze is thtere coroutine suuport in spring data?

qwert_ukg

03/19/2019, 10:11 AM

How to remove

Thread.sleep(1000)

and start second part of test, right directly after launch will be complited?

-.kt

xenoterracide

03/19/2019, 8:15 PM

spring data question

interface InserterPacket100hz {
    fun myInsertAll(list: Collection<Packet100hz> )
}
interface Packet100hzRepo: CrudRepository<Packet100hz, RFID>, InserterPacket100hz

@Repository
internal class Packet100HzInsertImpl(private val jdbc: JdbcTemplate): InserterPacket100hz {

    override fun myInsertAll(list: Collection<Packet100hz>) {
        var sql = "INSERT INTO packet_100hz_secure (rfid, pressure_signal, uo_pressure, chamber_pressure, ultrasonic_signal, \"timestamp\") VALUES "
        for (packet100hz in list) {
            // 6 cols
            sql += "(?, ?, ?, ?, ?, ?)\n" // maybe should use string builder
        }
        val inserts = list.flatMap {
            listOf(
                it.rfid.rfid,
                it.pressureSignal,
                it.uoPressure,
                it.chamberPressure,
                it.ultrasonicSignal,
                it.rfid.timestamp
            )
        }.toTypedArray()
        jdbc.update( sql, inserts )
    }
}

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property myInsertAll found for type Packet100hz!

… well no duh spring… trying to do a custom repository implementation, anyone know what I’m doing wrong?

sdeleuze

03/27/2019, 8:13 AM

Hey, does anybody knows if there is a cleaner way than what I did in https://github.com/spring-projects/spring-fu/blob/master/kofu/src/main/kotlin/org/springframework/fu/kofu/BeanDefinitionDslExtensions.kt (defining 22 reified overloaded methods from

Function1

Function22

) to acheive reflection-less injection of parameters by type?

Czar

03/27/2019, 10:40 AM

I've stumbled upon a strange thing in spring-fu. Tests written in java using

var

, which is JDK10+ feature, while there is this in build.gradle.kts:

tasks.compileJava {
	sourceCompatibility = "1.8"
	targetCompatibility = "1.8"
}

How does this work? My IntelliJ is swearing at me 🙂

Title

Czar

03/27/2019, 10:40 AM

I've stumbled upon a strange thing in spring-fu. Tests written in java using

var

, which is JDK10+ feature, while there is this in build.gradle.kts:

tasks.compileJava {
	sourceCompatibility = "1.8"
	targetCompatibility = "1.8"
}

How does this work? My IntelliJ is swearing at me 🙂

christophsturm

03/27/2019, 10:47 AM

tests are probably compiled via tasks.compileTestJava

Czar

03/27/2019, 10:51 AM

but that one is not configured, so I assume 1.8 is used for both...

christophsturm

03/27/2019, 10:54 AM

i think it stays at the default value

JavaVersion sourceCompatibility
Java version compatibility to use when compiling Java source. Default value: version of the current JVM in use JavaVersion.

Czar

03/27/2019, 11:01 AM

Ok, so that's resolved by specifying JDK 11 for gradle in IntelliJ settings.

Thank you, your comment nudged me in the direction of the solution.

christophsturm

03/27/2019, 12:04 PM

yw! I do think that it should be specified in the gradle file, i was just guessing why it works for some people without.

sdeleuze

03/27/2019, 2:44 PM

https://github.com/spring-projects/spring-fu/commit/56fa18d684cb4daeca7166d9adf36ad09b962787

👍 2

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