BAEL-95490 Review warnings in kotlin-build job

core-kotlin-modules/core-kotlin-2/src/main/kotlin/com/baeldung/alias/TypeAlias.kt

@@ -5,12 +5,14 @@ import java.util.concurrent.CompletableFuture
 typealias CreditCard = String
 fun linkCard(card: CreditCard) {
     // omitted
+    println(card)
 }
 
 fun main() {
     val cc: CreditCard = "1234****"
     linkCard(cc)
-    val other = cc.toUpperCase()
+    val other = cc.uppercase()
+    println("CreditCard uppercase: $other")
     linkCard("1234****")
 }
 

core-kotlin-modules/core-kotlin-2/src/main/kotlin/com/baeldung/staticinit/Static.kt

@@ -3,7 +3,7 @@ package com.baeldung.staticinit
 class Static {
 
     companion object {
-        lateinit var answer: String
+        var answer: String
 
         init {
             answer = "42"

core-kotlin-modules/core-kotlin-2/src/test/kotlin/com/baeldung/varargs/Vararg.kt

@@ -10,7 +10,9 @@ fun printStrings(vararg vs: String) {
     vs.forEach { println(it) } // Array<String>
 }
 
-fun createUser(vararg roles: String, username: String, age: Int) {}
+fun createUser(vararg roles: String, username: String, age: Int) {
+    println("Input params. roles: $roles, username: $username, age: $age")
+}
 
 fun main() {
     createUser("admin", "user", username = "me", age = 42)

core-kotlin-modules/core-kotlin-3/src/main/kotlin/com/baeldung/getterssetters/Book.kt

@@ -9,7 +9,7 @@ class Book {
 
     val title: String = DEFAULT_TITLE
         get() {
-            return field.toUpperCase()
+            return field.uppercase()
         }
 
     var rating: Int = 5

core-kotlin-modules/core-kotlin-3/src/main/kotlin/com/baeldung/initblock/Person.kt

@@ -24,5 +24,5 @@ class Person(val firstName: String, val lastName: String) {
 }
 
 fun main() {
-    val p = Person("dehghani")
+    Person("dehghani")
 }

core-kotlin-modules/core-kotlin-3/src/test/kotlin/com/baeldung/getterssetters/BookUnitTest.kt

@@ -18,7 +18,7 @@ class BookUnitTest {
     fun `Given a Book instance, When title property is read, Then custom getter is called`() {
         val book = Book()
 
-        assertEquals(DEFAULT_TITLE.toUpperCase(), book.title)
+        assertEquals(DEFAULT_TITLE.uppercase(), book.title)
     }
 
 

core-kotlin-modules/core-kotlin-4/src/main/kotlin/com/baeldung/hof/HTTPClientStub.kt

@@ -9,9 +9,12 @@ val clientExecutor: ExecutorService = Executors.newSingleThreadExecutor()
 val image = "CDBmleEGw\"V.\t_1᪉-nm@FiUsQuGҘ*-*bQӘ4?`q;?7y1Z~ᡷ}V=BX!%S>TtecHkmdXhi3".encodeToByteArray()
 
 class HTTPClientStub {
-    fun get(imageUrl: URL): Response = Response(200) { image }
+    fun get(imageUrl: URL): Response = Response(200) {
+        println("Image URL is: $imageUrl")
+        image
+    }
     fun put(url: String, body: ByteArray) {
-
+        println("Input params. URL: $url, body: $body")
     }
 }
 

core-kotlin-modules/core-kotlin-4/src/main/kotlin/com/baeldung/hof/HigherOrderFunctions.kt

@@ -60,7 +60,7 @@ fun unrefactoredFunction(imageUrl: URL, objectId: String) {
 
     val imageData = imageResponse.receive()
 
-    val cdnResponse = try {
+    try {
         clientExecutor.submit(Callable { client.put("$CDN_URL/$objectId", imageData) })
             .get(10L, TimeUnit.SECONDS)
     } catch (ex: Exception) {

core-kotlin-modules/core-kotlin-4/src/main/kotlin/com/baeldung/run/RunClass.kt

@@ -14,7 +14,7 @@ class RunClass {
     }
 }
 
-fun main(args: Array<String>) {
+fun main() {
     println("Running the main function")
     RunClass().printInsideClass()
 }

core-kotlin-modules/core-kotlin-4/src/test/kotlin/com/baeldung/varargSpread/VarargSpread.kt

@@ -32,7 +32,7 @@ class VarargSpread {
         val listOfStrings = listOf("ab", "cd")
         assertTrue { concat(*strings) == "abcd" }
         assertTrue { concat2(*strings) == "01abcd" }
-        assertTrue { concat3(strings = *strings, initialValue = "01") == "01abcd" }
+        assertTrue { concat3(strings = strings, initialValue = "01") == "01abcd" }
         assertTrue { concat(*strings, "ef", *moreStrings) == "abcdefghij" }
         assertTrue { concat(*listOfStrings.toTypedArray()) == "abcd" }
     }

core-kotlin-modules/core-kotlin-5/src/test/kotlin/com/baeldung/evenodd/FirstNElementsUnitTest.kt

@@ -2,6 +2,7 @@ package com.baeldung.evenodd
 
 import org.junit.jupiter.api.Test
 import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
 
 class FirstNElementsUnitTest {
 
@@ -45,6 +46,8 @@ class FirstNElementsUnitTest {
   fun `Convert a list to an array`() {
     val list: List<Int> = listOf(1, 2, 3, 4)
     val array: Array<Int> = list.toTypedArray()
+      assertEquals(1, array[0])
+      assertEquals(2, array[1])
   }
 
   @Test

core-kotlin-modules/core-kotlin-6/src/main/kotlin/com/baeldung/deprecation/Date.kt

@@ -34,5 +34,5 @@ fun main() {
     println(epoch.monthNumber())
     println(epoch.month())
 
-    Date.now()
+    LocalDateTime.now()
 }

core-kotlin-modules/core-kotlin-6/src/main/kotlin/com/baeldung/unusedParamter/UnusedParameter.kt

@@ -1,6 +1,6 @@
 package com.baeldung.unusedParamter
 
-fun paramInFunction(num: Int, magic: String) {
+fun paramInFunction(num: Int) {
     println("We only use the Int parameter: $num")
 }
 
@@ -16,7 +16,7 @@ fun paramInFunction3(num3: Int, magic3: String) {
 
 
 fun paramInLambda() {
-    listOf("Kotlin", "Java", "Python").forEachIndexed { idx, value -> println("We only print the of index the element: $idx") }
+    listOf("Kotlin", "Java", "Python").forEachIndexed { idx, _ -> println("We only print the of index the element: $idx") }
 }
 
 fun paramInLambda2() {

core-kotlin-modules/core-kotlin-6/src/test/kotlin/com/baeldung/parseUrl/ParseUrlUnitTest.kt

@@ -20,7 +20,7 @@ class ParseUrlUnitTest {
 
     @Test
     fun `given url when parsed with URL class returns user parameter`() {
-        val url = URL(urlToParse)
+        val url = URI(urlToParse).toURL()
         val userNameFromUrl = url.findParameterValue("user")
         assertThat(userNameFromUrl).isEqualTo("Bob")
         assertThat(url.protocol).isEqualTo("https")

core-kotlin-modules/core-kotlin-7/src/main/kotlin/com/baeldung/runCatchingTryFinally/RunCatchingTryFinally.kt

@@ -1,7 +1,7 @@
 package com.baeldung.runCatchingTryFinally
 
 fun tryToDoSomething(): Int {
-    var result = 0
+    var result: Int
     val resource = acquireResource()
     try {
         // Code that can throw an exception
@@ -24,5 +24,10 @@ fun doSomethingRunCatching(): Int {
 
 
 fun acquireResource() = Any()
-fun releaseResource(any: Any) = Any()
-fun performAction(any: Any) = 1
+fun releaseResource(any: Any) {
+    println("Any is: $any")
+}
+fun performAction(any: Any): Int {
+    println("Any is: $any")
+    return 1
+}

core-kotlin-modules/core-kotlin-8/src/main/kotlin/com/baeldung/exception/LineNumber.kt

@@ -34,17 +34,18 @@ fun basicTryCatch() {
             // Handle exception here
             val stackTrace = e.stackTrace
             // do something with the stackTrace
+            println("Stack trace: $stackTrace")
         }
 
         val result: Result<*> = runCatching {
             // Code that might throw an exception
         }
 
         result.fold(
-            onSuccess = { value ->
+            onSuccess = { _ ->
                 // Handle the successful execution
             },
-            onFailure = { exception ->
+            onFailure = { _ ->
                 // Handle exception here
             }
         )

core-kotlin-modules/core-kotlin-8/src/main/kotlin/com/baeldung/kdoc/Blog.kt

@@ -36,5 +36,6 @@ data class TitledArticle(private val title: String)
 private fun blogSample() {
     val blog = Blog<TitledArticle>("Baeldung on Kotlin")
     val blogCount = blog.add(TitledArticle("An Introduction to KDoc"))
+    println("Blog count is: $blogCount")
 }
 

core-kotlin-modules/core-kotlin-8/src/main/kotlin/com/baeldung/todo/Calculator.kt

@@ -2,10 +2,12 @@ package com.baeldung.todo
 
 class Calculator {
     fun add(a: Int, b: Int): Int {
+        println("Input. a= $a and b= $b")
         TODO("Implement a + b")
     }
 
     fun subtract(a: Int, b: Int): Int {
+        println("Input. a= $a and b= $b")
         TODO("Implement a - b")
     }
 }

core-kotlin-modules/core-kotlin-8/src/test/kotlin/com/baeldung/convertAnyToInt/ConvertAnyToIntTest.kt

@@ -18,7 +18,7 @@ class ConvertAnyToIntTest {
     fun `when casting to Int then exception is thrown`() {
         val anyValue: Any = "Not a number"
         assertThrows<ClassCastException> {
-            val intValue: Int = anyValue as Int
+            anyValue as Int
         }
     }
 
@@ -27,7 +27,6 @@ class ConvertAnyToIntTest {
         val anyValue: Any = "Not a number"
         assertThrows<NumberFormatException> {
             if (anyValue is Int) {
-                val intValue: Int = anyValue
             } else {
                 throw NumberFormatException("Provided value is not a number")
             }

core-kotlin-modules/core-kotlin-9/src/test/kotlin/com/baeldung/underscoreoperator/UnderScoreOperator.kt

@@ -2,21 +2,24 @@ package com.baeldung.underscoreoperator
 // Before Kotlin 1.7
 class Box<T>(value: T) {
     // Some class implementation
+    var a = value
 }
 fun main() {
     val intBox: Box<Int> = Box(42)
+    println("Int box is: $intBox")
     val anyBox: Box<Any> = Box("Some value")
+    println("Any box is: $anyBox")
 }
-fun main1(args: Array<String>) {
+fun main1() {
     val (_, second) = "ignored" to "hello"
     println(second)
 }
-fun mainTwo(args: Array<String>) {
+fun mainTwo() {
     val list = listOf("hi")
     val list2 = list.mapIndexed { _, item -> item }
     println(list2)
 }
-inline fun <T> printElementInfo(element: T) {
+fun <T> printElementInfo(element: T) {
     println("Element: $element")
 }
 fun mainForHOF() {

core-kotlin-modules/core-kotlin-9/src/test/kotlin/com/baeldung/util/Utils.kt

@@ -15,7 +15,7 @@ object MathUtils {
 
 object ExtensionUtil {
     fun String.isPalindrome(): Boolean {
-        val cleanString = this.replace("\\s".toRegex(), "").toLowerCase()
+        val cleanString = this.replace("\\s".toRegex(), "").lowercase()
         return cleanString == cleanString.reversed()
     }
 }

core-kotlin-modules/core-kotlin-9/src/test/kotlin/com/baeldung/whenenum/Enum.kt

@@ -24,7 +24,7 @@ fun getDailyRoutine(day: Day): String {
     }
 }
 
-fun main(args: Array<String>) {
+fun main() {
     val shape: Shape = Shape.Triangle
     when (shape) {
         Shape.Square -> println("I'm a square")

core-kotlin-modules/core-kotlin-advanced-2/src/main/kotlin/com/baeldung/callbacktocoroutine/CallbackToCoroutineExample.kt

@@ -1,6 +1,7 @@
 package com.baeldung.callbacktocoroutine
 
 import kotlinx.coroutines.CoroutineExceptionHandler
+import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
 import kotlin.coroutines.resume
@@ -51,17 +52,17 @@ class CallbackToCoroutineExample {
         return "processed-data"
     }
 
+    @OptIn(DelicateCoroutinesApi::class)
     fun main() {
-        val exceptionHandler = CoroutineExceptionHandler { _, throwable ->
+        val exceptionHandler = CoroutineExceptionHandler { _, _ ->
             // Handle exception
         }
 
         // Calling the fetchData function within a coroutine scope with an exception handler
         GlobalScope.launch(exceptionHandler) {
             val result = fetchDataWithCoroutine()
             // Handle successful result
+            print("Result is: $result")
         }
     }
-
-
 }

core-kotlin-modules/core-kotlin-advanced-2/src/main/kotlin/com/baeldung/callbacktocoroutine/CoroutineExample.kt

@@ -14,12 +14,14 @@ class CoroutineExample {
         return@withContext "processed-data"
     }
 
+    @OptIn(DelicateCoroutinesApi::class)
     fun main() {
         // Calling the fetchData function within a coroutine scope
         GlobalScope.launch {
             try {
                 val result = fetchData()
                 // Handle successful result
+                println("Result is: $result")
             } catch (error: Throwable) {
                 // Handle error
             }

core-kotlin-modules/core-kotlin-advanced-2/src/main/kotlin/com/baeldung/generic/inline/Samples.kt

@@ -6,8 +6,10 @@ value class Wrapper<T>(val value: T)
 fun main() {
     val wrapper = Wrapper<Int>(42)
     val value: Int = wrapper.value // No runtime overhead
+    println("Value is: $value")
     val list = listOf(42)
     val item: Int = list[0] // Boxing and unboxing overhead
+    println("Item is: $item")
 }
 
 @JvmInline

core-kotlin-modules/core-kotlin-advanced-2/src/main/kotlin/com/baeldung/returnmultiple/main.kt

@@ -20,8 +20,8 @@ fun main() {
     val (name, age) = twoPair()
     println("$name is $age years old")
 
-    val (name2, age2, bornOn) = threeValues()
-    val (v1, v2, v3, v4, v5) = fiveValues()
-    val (podName, ip, assignedNode) = getUniquePod()
-    val (publicKey, privateKey) = getRsaKeyPair()
+    val (_, _, _) = threeValues()
+    val (_, _, _, _, _) = fiveValues()
+    val (_, _, _) = getUniquePod()
+    val (_, _) = getRsaKeyPair()
 }

core-kotlin-modules/core-kotlin-advanced-2/src/test/kotlin/com/baeldung/callback/CallbackFunctionUnitTest.kt

@@ -92,7 +92,7 @@ class CallbackFunctionUnitTest {
         }
 
         fun openPDF(bookId: Int){
-            downloadBook { id ->
+            downloadBook { _ ->
                 saveBook(bookId){bookId ->
                     openBook(bookId)
                 }

core-kotlin-modules/core-kotlin-advanced-2/src/test/kotlin/com/baeldung/serialization/defaultValueParameters/DefaultValueSerializationUnitTest.kt

@@ -2,6 +2,7 @@ package com.baeldung.serialization.defaultValueParameters
 
 import kotlinx.serialization.EncodeDefault
 import kotlinx.serialization.Serializable
+import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.decodeFromString
@@ -17,7 +18,7 @@ data class Car1(val type: String, val color: String)
 data class Car2(val type: String, val color: String = "Blue")
 
 @Serializable
-data class Car3(val type: String, @EncodeDefault val color: String = "Blue")
+data class Car3 @OptIn(ExperimentalSerializationApi::class) constructor(val type: String, @EncodeDefault val color: String = "Blue")
 
 class DefaultValueSerializationUnitTest {
 

core-kotlin-modules/core-kotlin-advanced/src/main/kotlin/com/baeldung/logging/LoggerAsExtensionOnAny.kt

@@ -15,7 +15,7 @@ class ExtensionSubclass : LoggerAsExtensionOnAny()
 
 fun <T : Any> T.logger(): Logger = getLogger(getClassForLogging(javaClass))
 
-fun main(args: Array<String>) {
+fun main() {
     LoggerAsExtensionOnAny().log("test")
     ExtensionSubclass().log("sub")
     "foo".logger().info("foo")

core-kotlin-modules/core-kotlin-advanced/src/main/kotlin/com/baeldung/logging/LoggerAsExtensionOnMarkerInterface.kt

@@ -23,7 +23,7 @@ open class LoggerAsExtensionOnMarkerInterface : Logging {
 
 class MarkerExtensionSubclass : LoggerAsExtensionOnMarkerInterface()
 
-fun main(args: Array<String>) {
+fun main() {
     LoggerAsExtensionOnMarkerInterface().log("test")
     MarkerExtensionSubclass().log("sub")
     "foo".logger().info("foo")