K2 Compiler. Overview (#954)

* KTLN-507 source code

* KTLN-507 Core review fixes

* K2 Compiler overview

* Added missing import

Author: mipo256

k2-compiler/pom.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>k2-compiler</artifactId>
+    <name>k2-compiler</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>kotlin-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <properties>
+        <kotlin.version>2.0.0</kotlin.version>
+    </properties>
+
+</project>

k2-compiler/src/main/kotlin/com/baeldung/kotlin/k2/ChildClass.kt

@@ -0,0 +1,3 @@
+class ChildClass : ParentClass() {
+  fun greeting(s: String) = hello(s)
+}

k2-compiler/src/main/kotlin/com/baeldung/kotlin/k2/Examples.kt

@@ -0,0 +1,21 @@
+import java.lang.reflect.InvocationTargetException
+
+fun translateExecution(exception: Throwable?): Throwable? {
+  val isInvocationTargetException = exception is InvocationTargetException
+
+  if (isInvocationTargetException) {
+    return (exception as InvocationTargetException).targetException
+  }
+
+  return exception
+}
+
+fun translateExecutionV2(exception: Throwable?) : Throwable? {
+  val isInvocationTargetException = exception is InvocationTargetException
+
+  if (isInvocationTargetException) {
+    return exception.targetException
+  }
+
+  return exception
+}

k2-compiler/src/main/kotlin/com/baeldung/kotlin/k2/ParentClass.kt

@@ -0,0 +1,3 @@
+open class ParentClass {
+  internal fun hello(s: String) = println("Hello, $s!")
+}

pom.xml

@@ -385,6 +385,7 @@
                 <module>core-kotlin-modules</module>
                 <!-- <module>gradle-kotlin-dsl</module> --> <!-- not a Maven module -->
                 <!-- <module>jee-kotlin</module> -->  <!-- Can't upgrade this project. Arquillian not maintained anymore.-->
+                <module>k2-compiler</module>
                 <module>koin-guide</module>
                 <module>kotlin-kotest</module>
                 <module>kotlin-apache-kafka</module>
@@ -464,6 +465,7 @@
                 <module>core-kotlin-modules</module>
                 <!-- <module>gradle-kotlin-dsl</module> --> <!-- not a Maven module -->
                 <!-- <module>jee-kotlin</module> -->  <!-- Can't upgrade this project. Arquillian not maintained anymore.-->
+                <module>k2-compiler</module>
                 <module>koin-guide</module>
                 <module>kotlin-kotest</module>
                 <module>kotlin-apache-kafka</module>