Document some non-nullable Kotlin extensions can throw NoSuchElementException

Closes gh-31189

spring-messaging/src/main/kotlin/org/springframework/messaging/rsocket/RSocketRequesterExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -110,6 +110,7 @@ suspend fun RSocketRequester.RetrieveSpec.sendAndAwait() {
 /**
  * Coroutines variant of [RSocketRequester.RetrieveSpec.retrieveMono].
  *
+ * @throws NoSuchElementException if the underlying [Mono] does not emit any value
  * @author Sebastien Deleuze
  * @since 5.2
  */

spring-r2dbc/src/main/kotlin/org/springframework/r2dbc/core/RowsFetchSpecExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,10 +19,12 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.reactive.asFlow
 import kotlinx.coroutines.reactor.awaitSingleOrNull
 import org.springframework.dao.EmptyResultDataAccessException
+import reactor.core.publisher.Mono
 
 /**
  * Non-nullable Coroutines variant of [RowsFetchSpec.one].
  *
+ * @throws EmptyResultDataAccessException if the underlying [Mono] does not emit any value
  * @author Sebastien Deleuze
  */
 @Suppress("DEPRECATION")
@@ -42,6 +44,7 @@ suspend fun <T> RowsFetchSpec<T>.awaitOneOrNull(): T? =
 /**
  * Non-nullable Coroutines variant of [RowsFetchSpec.first].
  *
+ * @throws EmptyResultDataAccessException if the underlying [Mono] does not emit any value
  * @author Sebastien Deleuze
  */
 @Suppress("DEPRECATION")

spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/client/ClientResponseExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -102,6 +102,7 @@ suspend inline fun <reified T : Any> ClientResponse.awaitBody(): T =
  * `KClass` non-nullable coroutines variant of [ClientResponse.bodyToMono].
  * Please consider `awaitBody<Foo>` variant if possible.
  *
+ * @throws NoSuchElementException if the underlying [Mono] does not emit any value
  * @author Igor Manushin
  * @since 5.3
  */

spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/client/WebClientExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -143,6 +143,7 @@ inline fun <reified T : Any> WebClient.ResponseSpec.bodyToFlow(): Flow<T> =
 /**
  * Coroutines variant of [WebClient.ResponseSpec.bodyToMono].
  *
+ * @throws NoSuchElementException if the underlying [Mono] does not emit any value
  * @author Sebastien Deleuze
  * @since 5.2
  */

spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/ServerRequestExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -76,6 +76,7 @@ fun <T : Any> ServerRequest.bodyToFlow(clazz: KClass<T>): Flow<T> =
 /**
  * Non-nullable Coroutines variant of [ServerRequest.bodyToMono].
  *
+ * @throws NoSuchElementException if the underlying [Mono] does not emit any value
  * @author Sebastien Deleuze
  * @since 5.2
  */
@@ -86,6 +87,7 @@ suspend inline fun <reified T : Any> ServerRequest.awaitBody(): T =
  * `KClass` non-nullable Coroutines variant of [ServerRequest.bodyToMono].
  * Please consider `awaitBody<Foo>` variant if possible.
  *
+ * @throws NoSuchElementException if the underlying [Mono] does not emit any value
  * @author Igor Manushin
  * @since 5.3
  */