Last updated on December 21, 2021
Files after download
Download AdoptOpenJDK
AdoptOpenJDK – Open source, prebuilt OpenJDK binaries
OpenJDK11U-jdk_x64_windows_hotspot_11.0.13_8.msi
On install:
Add to PATH, Set JAVA_HOME on local HD.
C:\Users\jekl>java -version
openjdk version “11.0.13” 2021-10-19
OpenJDK Runtime Environment Temurin-11.0.13+8 (build 11.0.13+8)
OpenJDK 64-Bit Server VM Temurin-11.0.13+8 (build 11.0.13+8, mixed mode
Download Kotlin zip
Release Kotlin 1.6.10 · JetBrains/kotlin (github.com)
kotlin-compiler-1.6.10.zip unzip it somewhere
C:\giti2021\Kotlins\kotlin-compiler-1.6.10\kotlinc
Add KOTLIN_HOME and Path
Click on the Edit environment variables for your account shortcut.
Enter “KOTLIN_HOME” as variable name. Enter the [KOTLIN_INSTALL_DIR] as variable value.
Next, we need to configure the PATH environment variable so we can run Kotlin from a command prompt.
Select the PATH variable. Click on Edit, New and add a new path:
%KOTLIN_HOME%\bin
C:\Users\jekl>kotlinc -version
info: kotlinc-jvm 1.6.10 (JRE 11.0.13+8)
Verify home with cmd
echo %JAVA_HOME%
echo %KOTLIN_HOME%
Yields
C:\Program Files\Eclipse Adoptium\jdk-11.0.13.8-hotspot\
C:\giti2021\Kotlins\kotlin-compiler-1.6.10\kotlincConsider project files
Where Main.kt is importing both classes
Compile and run a jar (single class)
# Compile from .
kotlinc -include-runtime -d Main.jar Main.kt
# Run it
java -jar Main.jar
Compile and run a jar (multiple class, will work here since main is referencing 2 classes)
# Compile from .
kotlinc -include-runtime -d Main.jar Main.kt Helper.kt Utility.kt
# Run it
java -jar Main.jar
Result
Note, dependency and red lines in VSC
vscode: cannot access built in declaration. · Issue #153 · fwcd/kotlin-language-server (github.com)
Turns out as soon as I installed gradle, using sdk install gradle, language-server suddenly started functioning as expected. Without adding a gradle project in the directory.
Install Gradle (did not help, but could be nice to learn Gradle)
Microsoft Windows users
Create a new directory C:\Gradle with File Explorer.
Open a second File Explorer window and go to the directory where the Gradle distribution was downloaded. Double-click the ZIP archive to expose the content. Drag the content folder gradle-7.3.2 to your newly created C:\Gradle folder.
Alternatively you can unpack the Gradle distribution ZIP into C:\Gradle using an archiver tool of your choice.
Step 3. Configure your system environment
Microsoft Windows users
In File Explorer right-click on the This PC (or Computer) icon, then click Properties -> Advanced System Settings -> Environmental Variables.
Under System Variables select Path, then click Edit. Add an entry for C:\Gradle\gradle-7.3.2\bin. Click OK to save.
Step 4. Verify your installation
Open a console (or a Windows command prompt) and run gradle -v to run gradle and display the version, e.g.:
Still :
visual studio code – Kotlin, unresolved reference on everything in VSCode – Stack Overflow
Remove Kotlin, but keep kotlin language (did help)
Import java.util.*
Since we are using the JVM from AdoptOpenJDK we can use all libs fra Java.
import java.util.*
class Utility {
fun getStr(): String {
return "Utility str"
}
fun randomJava() {
var ran = Random()
var nr = ran.nextInt(100)
var fl = ran.nextFloat()
println(nr)
println(fl)
}
}Compile it and run it:
kotlinc -include-runtime -d Main.jar Main.kt Helper.kt Utility.kt
java -jar Main.jar
[]
Hello from VSC
12
WORKER1 28
Utility str
30
0.27628368