springBoot

or did you mean the library for Https responses?

no that’s accurate. you should google “spring boot exception handling”

or check out #spring

would the change be in the logic level (above) or endpoint level?

This could be a decent link https://www.baeldung.com/exception-handling-for-rest-with-spring

What do you use for building Kotlin web applications?

i basically need to mask the

bankAccountNumber

property in the payload

any advice here?

And in case we needed a reminder about the value of masked data in structured logs, up pops a timely example.. 🙃 https://monzo.com/blog/2019/08/05/weve-fixed-an-issue-storing-some-customers-pins/

Hey guys! I'm working now on a server to accept connections and retrieve data. I've tried to implement with raw sockets (https://ktor.io/servers/raw-sockets.html) and it's working on local, but when i try to connect by a external computer with my external IP, I cannot connect. My firewall is turned off. What could be the problem? (My code is the same that the sample of https://ktor.io/servers/raw-sockets.html)

which address(es) are you binding to?

I've tried bind 0.0.0.0 to bind all

Do you have any firewall?

Are you using their client and server?

The firewall is turned off, and i'm using the code of the server, but connecting to it by telnet

can you telnet to anything else on the server?

Yeah. Is it necessary to open anything on the router to accept connections?

Hey guys. I'm hoping someone can help me achieve what I need to do here. My problem - I'm trying to use coroutines in my Spring `@RestController`s to do upstream REST API calls, using Retrofit 2.6.1. I'm getting an unexpected behavior though, when Retrofit throws a SocketTimeoutException. Here's some simplified sample code:

@GetMapping
@Throws(RetrofitCallExecutionException::class)
fun myControllerEndpointMethod() {
    ...
    runBlocking(<http://Dispatchers.IO|Dispatchers.IO>) {
        val deferredUpstreamCall1 = async { upstreamApi.call1() }
        val deferredUpstreamCall2 = async { upstreamApi.call2() }
        val call1ResponseObject = getDeferredRetrofitResponseBody("upstreamApi.call1()", deferredUpstreamCall1, true)
        val call2ResponseObject = getDeferredRetrofitResponseBody("upstreamApi.call2()", deferredUpstreamCall2, true)
       ...
    }
}


open suspend fun <T> getDeferredRetrofitResponseBody(deferredResponseName: String, deferredResponse: Deferred<Response<T>>, throwOnError: Boolean = false) : T? {
	try {
		val response = deferredResponse.await()
		return if(response.isSuccessful) {
			val body = response.body()
			logger.debug("Got successful response for $deferredResponseName: $body")
			body
		} else{
			val errorMessage = "Error getting response for $deferredResponseName! Response Code[${response.code()}] Error Body[${getErrorResponseBody(response.errorBody())}]."
			logger.error(errorMessage)
			if(throwOnError) {
				throw RetrofitCallExecutionException(errorMessage)
			}
			null
		}
	} catch (ioe: IOException) {
		val errorMessage = "IOException while awaiting response for $deferredResponseName!"
		logger.error(errorMessage, ioe)
		if(throwOnError) {
			throw RetrofitCallExecutionException(errorMessage, ioe)
		}
	} catch (re: RuntimeException) {
		val errorMessage = "RuntimeException while awaiting response for $deferredResponseName!"
		logger.error(errorMessage, re)
		if(throwOnError) {
			throw RetrofitCallExecutionException(errorMessage, re)
		}
	}

	return null
}

@ExceptionHandler(RetrofitCallExecutionException::class)
fun handleRetrofitCallExecutionException(exception: RetrofitCallExecutionException) : ResponseEntity<PlatformErrorResponseDto> {
	<http://LOGGER.info|LOGGER.info>("handling RetrofitCallExecutionException raised. message[${exception.message}] cause[${exception.cause}]")
	return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build()
}

Now, lets say

upstreamApi.call1()

throws a SocketTimeoutException. If i step through the code in the debugger, I end up in my

catch (ioe: IOException)

block as expected. But I never end up in my

@ExceptionHandler

annotated method. I end up in my catch-all

@ExceptionHandler

that catches

Exception

, and the exception I'm getting is

UndeclaredThrowableException

, with the

SocketTimeoutException

as the cause and my

RetrofitCallExecutionException

in the list of suppressedExceptions. If I annotate my controller method with

@Throws(SocketTimeoutException::class)

and create an

@ExceptionHandler

method for SocketTimeoutException, I can catch it, and my

RetrofitCallExecutionException

is in the list of suppressedExceptions. So, how can I get Kotlin to throw my

RetrofitCallExecutionException

, so I can trap it in an

@ExceptionHandler

? I'm using Spring Boot 1.x, so I don't have any of the official support for Kotlin that Spring Boot 2.x brings. Could that be my problem?

Hi guys

Where I can find courses Kotlin for spring developing?

Hello someone here?

If you have done spring with java before, I think it would be quiet easy to get going on spring kotlin with this tutorial https://spring.io/guides/tutorials/spring-boot-kotlin/

Ty, I'm not a spring programmer just wanted to learn spring for back dev

I Android dev on Kotlin and want code in back too

You would see more examples and courses in java but you can easily convert them to kotlin with the basic idea

@tjohnn It seems easily tutorial than others. thx 😀

Hello everyone, I start learning Kotlin language and I want create api service by gRPC KrotoPlus that needs kotlin. I started iOS development since 2015.

What are preferred web framework in kotlin now days

Coming from Golang jvm ecosystem is huge