Hi guys, posted this question about dealing with sealed classes / Json in #jackson-kotlin (not sure if that channel is alive). I would expect someone has dealt with this issue before with Json: https://kotlinlang.slack.com/archives/C0BLHCSHZ/p1519664898000575

Hey guys, Mixing java + kotlin in a spring boot 2 app along with maven configuration is there any example available? The same app with gradle works fine but not with maven. Any ideas or hints about pom.xml configuration ?

Jackson, with the

@JsonCreator

annotation

is there a way to get Spring web to return a 404 if my controller returns an

Optional

that is not present?

what is the advantage of using runApplication instead of springApplication.run()

I see.. that looks pretty good. Only downside is that it cant be

val

. Thanks

I use spring-boot-2.0.0 with korlin and mongodb, I get this warning every time I start up application,

org.reflections.ReflectionsException: could not create Vfs.Dir from url, no matching UrlType was found [file:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/libatk-wrapper.so]

I read it's nothing too serious, application is working fine. But why is it there ? How can I disable this warning ?

@sdeleuze All my Spring Boot tests are fully written in Kotlin and I am having trouble with context caching. I was wondering how it's supposed to work. I have overall 2 different context (A, B), each has a few tests (denoted by numbers). It runs like this:

Context A starts
Test A1 runs
Test A2 runs
Context B starts
Test B1 runs
Test B2 runs
Context A starts
Test A3 runs

Is this the expected behaviour? I was expecting Spring Boot to "group" the tests by context, but I guess it's just running in whatever order JUnit decided?

Will do

hi there. I have pretty strange question. I think not sure even that it`s possible to solve. I wan't move kafka configuration to the external module and make it reusable with generic(different Pojo in different modules) I'm not sure what subject should I learn about Spring and Kotlin (reflection probably)

@EnableKafka
@EnableAsync
@Configuration
class KafkaConfig<T>(
        @Autowired val objectMapper: ObjectMapper,
        @Value("\${kafka.bootstrap-servers}") val bootstrapServers: String,
        @Value("\${kafka.consumer.group-id}") val groupId: String,
        @Value("\${kafka.consumer.auto-offset-reset}") val autoOffsetReset: String
) {
    @Bean
    fun consumerFactory(): ConsumerFactory<String, T> = DefaultKafkaConsumerFactory(
            consumerConfigs(),
            JsonDeserializer(String::class.java, objectMapper),
            JsonDeserializer(T::class.java, objectMapper)
    )

}

So issue is - T as non a expression can`t provide ::class.java value Can any one help with documentation topic what I should start from?

Hello. I just noticed my

BigDecimal

properties are saved in mongo as

String

. Is this a known issue? I didn’t find anything on it when I googled.

Hi. Is it possible to map request params onto immutable class that has Hibernate Validation annotations (

@NotNull

) ?

Hi, I want to use OAuth2, but : - There's 3 kind of auths, a regular user/password, a phone/sms code, and an email/password (each type of auth is for a different user role), so i guess i need 3 different authorizationservers. - I want to configure a prefix for each type - I want to secure my api with them, AND basic I'm using spring boot 2 and spring security, how can i do that?

try

@field:

The more I look at it the more I think intelliJ itself should support scanning for

@ConfigurationProperties

as part of its Spring support

Is there something planned in either Kotlin or Spring to have the issue with default methods in interfaces for

JpaRepository

solved?

Spring Security will provide an automatically generated web form for user credential login... does the form communicate with the server via a RESTful API or...?

What error ?

Trying to upgrade to spring 5/ spring boot 2. I’ve got a``` Caused by: java.lang.NoClassDefFoundError: kotlin/reflect/full/KClasses ... Caused by: java.lang.ClassNotFoundException: kotlin.reflect.full.KClasses ``` going on.

As documented https://docs.spring.io/spring/docs/current/spring-framework-reference/languages.html#kotlin-requirements 😉

Does someone knows if it's possible to write a DSL to configure the URI of a

WebTestClient

instance? For example, instead of writing

client.get()
        .uri {
            it.path("/get")
                    .queryParam("name", "John Smith")
                    .queryParam("age", 45)
                    .queryParam("isCanadian", true)
                    .build()
        }
        .exchange()
        .expectStatus().isOk
        .expectBody()
        .jsonPath("$.person").exists()

Write something like

client.get()
        .uri("/get") {
            +queryParam("name" to "John Smith")
            +queryParam("age" to 45)
            +queryParam("isCanadian" to true)
        }
        .exchange()
        .expectStatus().isOk
        .expectBody()
        .jsonPath("$.person").exists()

not sure if this has been asked/answered already but has anyone encountered and solved the “error” message in Intellij:

Could not autowire. No beans of '' type found.

when using DSL bean definition?

hi there found funny issue have kotlin config class for kafka

@Configuration
class KafkaConfigurator(
        @Value("\${kafka.bootstrap-servers}") val bootstrapServers: String,
        @Value("\${kafka.consumer.group-id}") val groupId: String,
        @Value("\${kafka.consumer.auto-offset-reset}") val autoOffsetReset: String,
        @Autowired val objectMapper: ObjectMapper

) {
    //bla bla bla, few more beans 
    @Bean
    @Qualifier("producerConfigs")
    fun producerConfigs() = HashMap<String, Any>().apply { //values  }

    @Bean
    @Qualifier("consumerConfigs")
    fun consumerConfigs() = HashMap<String, Any>().apply { //values  } 
}

and I`m using it in 2 modules: one written on koltin+spring (1.5.12). here injections looks like

@EnableKafka
@EnableAsync
@Configuration
class KafkaConfig(
        @Autowired val stringJsonMessageConverter: StringJsonMessageConverter,
        @Autowired @Qualifier("producerConfigs") val producerConfigs: Map<String, Any>,
        @Value("\${kafka.topics.companies}") val companiesTopic: String,
        @Value("\${kafka.topics.customers}") val customersTopic: String
)

and another written on java+spring (1.5.12). here injections looks like

public class Application extends ResourceServerConfigurerAdapter {
    @Autowired
    @Qualifier("producerConfigs")
    Map<String, Object> producerConfigs;

    @Autowired
    StringJsonMessageConverter messageConverter;
}

so issue is that on injection to kotlin module - I have correct map with values that I want to get. But on injection to the java module I got map with key "producerConfigs" and value that contains map that I exactly need. wdyt - should it be reported some were to the spring github or something another?

Can anyone help with a MongoTemplate question? I have got a record structure which has nested arrays and I want to update a specific entry in a 2nd level array. I can find the appropriate entry easier enough by the Set path needs the indexes of both array entries & the '$' only refers to the leaf item. For example if I had an array of teams which contained an array of player I need to generate an update path like :

val query = Query(Criteria.where("teams.players.playerId").`is`(playerId))
        val update = Update()
        with(update) {
            set("teams.$.players.$.name", player.name)
        ...

This fails as the '$' can only be used once to refer to the index in the players array, I need a way to generate the equivalent '$' for the index in the teams array. Any ideas for this Mongo newbie?

FYI, I am starting to write 2 new opinionated guides "Building Kotlin applications with Spring Boot and WebFlux" and "Building Kotlin applications with Spring Boot and Spring MVC" because there are too much possible variants and I feel you don't always find the information because it is splitted in too much distinct places (slides, Framework ref doc, Boot ref doc, https://github.com/sdeleuze/ demo projects, Spring blogs, Kotlin Kdoc). There is a need for a pragmatic and canonical place where to find what look like such applications with all best practices. The WebFlux guide will use functional router DSL and handlers. Both will use Junit 5 +

@Autowired

injection and show how to do integrations tests and mocked tests.

@mp I guess you do it differently?

have u debug it ? add autowire of objectMapper and you will see what kind of mapper u have - 1st rule if you can ask compiler 😁 @poohbar pls continue in thread - we won't be verbose in channel

So I realized I am not actually getting JSON in the

@PostMapping

so it won't use Jackson at all. Can Spring bind form data to Kotlin data class?