not sure where to put this so I’ll also leave it here: https://kotlinlang.slack.com/archives/C0B8H786P/p1608044068234700

I have created a small project for all those unhappy because of changes and deprecations in Spring Data R2DBC 1.2.0, but lucky enough to use Kotlin in their projects. https://github.com/rjaros/r2dbc-e4k

Hi, how can I use #serialization in spring boot instead of jackson? I tried to exclude json module from spring boot and it worked, but when I add another dependency that uses jackson ie oauth jwt, spring starts using jackson again

Hi,everyone... I'm trying to upgrade from spring-boot 2.3.4 to 2.4.1 However, I'm getting:

Caused by: org.springframework.beans.factory.support.BeanDefinitionOverrideException: Invalid bean definition with name 'conversionServicePostProcessor' defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]: Cannot register bean definition [Root bean: class [org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=conversionServicePostProcessor; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]] for bean 'conversionServicePostProcessor': There is already [Root bean: class [org.springframework.security.config.annotation.web.reactive.WebFluxSecurityConfiguration]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=conversionServicePostProcessor; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/security/config/annotation/web/reactive/WebFluxSecurityConfiguration.class]] bound.

Anyone came across this? I'm using kotlin, reactive web, coroutines, functional router

I'm trying to use spring security kotlin dsl but IntelliJ doesn't suggest imports for the extension functions like

org.springframework.security.config.web.server.invoke

. Is this a known issue or just something on my side?

Heya! I am using

spring-data-jpa

in my project. In some of my entities I am defining associations as a

lateinit

fields. Like so:

@Entity
data class Example(...) {
    ...
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "anotherId", insertable = false, updatable = false)
    lateinit var another: AnotherEntity
}

However, it seems like hibernate does not really play well

latenit

field. After I do

repository.save(example)

, if I try to access

another

field I get

lateinit property has not been initialized

. Did anyone encountered such problem before?

move it to constructor

and data class is not recommended

data

classes are meant for value objects: 2 such objects are equals if all their properties are equals which is not the case for database entities i’d really avoid data classes to model entities

also there is problem with proxying as far as I understand and therefore you have problems with your lazy relationship

Live now: https://tanzu.vmware.com/developer/tv/code

Springing into kotlin

I'm trying to use a jobLauncher I made as a bean in a @configuration class, but I have trouble accessing it

it seems that in java people are using contexts for that, is that the same with Kotlin?

I'm doing it with a applicationContext.getBean(nameOftheBean) but I'm not 100% certain that's the right way

hi there. What do you think about this approach? Do you see some better approach? should be each class using this transactional block be dependant on TransactioManager or is this global approach feasible?

import org.springframework.transaction.PlatformTransactionManager
import org.springframework.transaction.support.DefaultTransactionDefinition
import org.springframework.transaction.support.TransactionTemplate
import java.util.concurrent.ConcurrentHashMap

class DefaultTransactionManagerProvider {
  companion object {
    const val DEFAULT_MANAGER_NAME = "default"
    private val managers = ConcurrentHashMap<String, PlatformTransactionManager>()
    fun registerManager(platformTransactionManager: PlatformTransactionManager, name: String = DEFAULT_MANAGER_NAME) {
      managers[name] = platformTransactionManager
    }

    fun get(name: String = DEFAULT_MANAGER_NAME): PlatformTransactionManager =
      managers[name] ?: throw IllegalStateException("Transaction manager named [$name] not provided")
  }
}

fun <R> transactional(
  transactionManagerName: String = DefaultTransactionManagerProvider.DEFAULT_MANAGER_NAME,
  transactionManager: PlatformTransactionManager = DefaultTransactionManagerProvider.get(transactionManagerName),
  propagationBehaviour: Int = DefaultTransactionDefinition().propagationBehavior,
  isolationLevel: Int = DefaultTransactionDefinition().isolationLevel,
  timeout: Int = DefaultTransactionDefinition().timeout,
  readOnly: Boolean = DefaultTransactionDefinition().isReadOnly,
  name: String? = DefaultTransactionDefinition().name,
  block: () -> R
): R {
  val transactionTemplate = TransactionTemplate(transactionManager)
  transactionTemplate.isolationLevel = isolationLevel
  transactionTemplate.propagationBehavior = propagationBehaviour
  transactionTemplate.timeout = timeout
  transactionTemplate.isReadOnly = readOnly
  name?.let { transactionTemplate.setName(it) }
  val execute = transactionTemplate.execute {
    block()
  }
  return execute!!
}

Hi! I'm very new to Spring Boot, and I made this data class to hold the properties of my SQL item:

@Entity
@Table
class Student(
	@Id
	@SequenceGenerator(name = "student_sequence", sequenceName = "student_sequence", allocationSize = 1)
	@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "student_sequence")
	val id: Long,
	val name: String,
	val email: String,
	val dateOfBirth: LocalDate,
	val age: Int = LocalDate.now().year - dateOfBirth.year
)

I'm trying to access it in this class, and I think I'm supposed to leave out the

id

so it can get filled in automatically, but it's not working. Here is where I try to create it:

@Configuration
class StudentConfig {
	@Bean
	fun commandLineRunner(repository: StudentRepository): CommandLineRunner {
		return CommandLineRunner{
			val theonlytails = Student(
				"TheOnlyTails",
				"<mailto:shacharzidon@gmail.com|shacharzidon@gmail.com>",
				LocalDate.of(2000, Month.JANUARY, 1)
			)

			repository.save(theonlytails)
		}
	}
}

What is going on here?

I guess you have to make id var and

Long?

it did not work

wait a sec

I think it's working

thanks so much!

How do make a data class property transient? I have a data class like this:

@Entity
@Table
data class Student(
    @Id
    @SequenceGenerator(name = "student_sequence", sequenceName = "student_sequence", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "student_sequence")
    var id: Long? = null,
    val name: String,
    val email: String,
    val dateOfBirth: LocalDate,
    val age: Int,
)

Since I have

dateOfBirth

, I can just calculate the age from it, so I want to make it transient. Thing is, I am very new to Spring Boot and SQL, and have no idea how to do this. Googling did not help. Thanks in advance!

first of all using data classes for JPA entities is not recommended and will cause issues when there will be need for proxying of your class

Ok, I'll switch to a regular one. What do I do next?

I would try something like this

@Entity
@Table
class Student(
    @Id
    @SequenceGenerator(name = "student_sequence", sequenceName = "student_sequence", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "student_sequence")
    var id: Long? = null,
    val name: String,
    val email: String,
    val dateOfBirth: LocalDate,
) {
    @Transient
    fun getAge(): Int = somemagic
}

not sure if @Transient is needed in this case

Looks like that worked perfectly! Thank you so much!

suggest a book to Master SpringBoot

Hello I have a private function to test. Since I can’t test private functions, I’m trying to test a function that uses this private function

private fun makeFormData()

fun sendDataToServer() = <http://client.post|client.post>().body(makeFormData())

The function that uses private function sends a http request to another server. Is there a way to capture this request and assert on body data?