• Kotlin in Action, an introductory video
• Functional Programming with Kotlin
• Why Kotlin is my next programming language
• Kotlin: The Good, The Bad, and The Ugly

Troubleshooting

Gradle builds do not work

• Problem: Gradle Kotlin builds do not work:

  :compileKotlin
  Using kotlin incremental compilation
  Caught an exception trying to connect to Kotlin Daemon
  java.lang.ClassNotFoundException: com.sun.tools.javac.util.Context
    
  ...
  
  Could not perform incremental compilation: Could not connect to Kotlin compile daemon
  Could not connect to kotlin daemon. Using fallback strategy.
  java.lang.ClassNotFoundException: com.sun.tools.javac.util.Context
          at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
  

• Solution: terminate the Gradle daemon, e.g. use ./gradlew --stop. If the problem persists, you might want to disable Gradle daemons.