Kotlin sandbox set up

[tklinchik]

I tried setting up kotlin in a Sandbox but keep getting "Could not find Kotlin compiler in ..". What exactly should the home directory be pointed to?

[patrykcelinski]

I had a similar problem with Scala, it should point to the directory where you have kotlin compiler (kotlinc) installed.

In my case I installed with SDKMAN so it is in:

/Users/patrykcelinski/.sdkman/candidates/kotlin/current/bin/kotlinc

So you need to configure in JitWatch this path:

/Users/patrykcelinski/.sdkman/candidates/kotlin/current/

Unfortunately something is wrong with JitWatch at the moment when it comes to Kotlin - I get:

Error: Unable to access jarfile jitwatch-sandbox-kotlin.jar

It compiles, but returns the above error when executing. It could be system related (I use MacOs) -cp vs -jar. I investigated and it is caused by the relative path used as the last argument in the executed command:

Running: /opt/homebrew/Cellar/openjdk@21/21.0.10/libexec/openjdk.jdk/Contents/Home/bin/java -XX:+UnlockDiagnosticVMOptions -XX:+LogCompilation -XX:LogFile=/Users/patrykcelinski/Programs/jitwatch/sandbox/sandbox.log -XX:+PrintAssembly -XX:-BackgroundCompilation -cp /Users/patrykcelinski/Programs/jitwatch/sandbox/classes:/Users/patrykcelinski/Programs/jitwatch/sandbox/classes/jitwatch-sandbox-kotlin.jar -jar jitwatch-sandbox-kotlin.jar 

I discovered you can fix this by setting the Working Directory to classes folder:

You also need to add the jitwatch-sandbox-kotlin.jar to classpath so your class (for instance HelloKt) appears in the autocomplete dropdown here where you analyze the JIT compilation of it: