In order to create my first, simple Kotlin project in Eclipse, I followed the steps in Getting Started with Eclipse Luna tutorial from Kotlin official website, i.e.:
- Install Kotlin Plugin for Eclipse from Eclipse Marketplace
- Open the Kotlin perspective and created a Kotlin Project
- Created the file "hello.kt" inside the "src" folder with the
main
method - Right-clicked the file > Run As > Kotlin Application
However, I keep get the following error in Eclipse console:
Error: Could not find or load main class HelloKt
I have double-checked the Run Configuration for my project, and it does set the "Main class" as HelloKt
(which I'm 100% sure it does not exist). Also, when I hit the "Search" button, the only item that Eclipse finds is HelloKt - (default package)
(which, again, does not exist).
For the sake of completeness, find below the code for hello.kt
file:
fun main(args: Array<String>) {
println("Hello, World")
}
I noticed the following divergences between the tutorial and what I did:
- I'm using a different Eclipse version (the tutorial suggests Luna; I'm using Mars.2).
- I'm using a different JDK version (the tutorial DOES not suggest any specific version, but from the images, we can see they have used
jdk1.6.0_45
, while I'm usingjdk1.7.0_79
.
Note that I'm using the latest version of Kotlin Eclipse Plugin, so this is not the same case as in this post. These are the versions in my current installation:
- Kotlin 0.7.2.v20160930-0748
- kotlin-eclipse-policy 0.7.2.v20160928-1525
- kotlin-weaving-feature 0.7.2.v20160928-1525
Can any of these divergences be the cause of the error while running the application?
Do you see/know any potential cause or known bug regarding this scenario?
UPDATE (May 14th, 2017)
Tried with Eclipse Neon.3 (eclipse.buildId=4.6.3.M20170301-0400), JDK 1.8.0_111, Kotlin 0.8.2.v20170314-0957 (kotlin-eclipse-policy 0.8.2.v20170314-0957, kotlin-weaving-feature 0.8.2.v20170314-0957, Equinox Weaving SDK 1.2.0.201701131634). The problem persists.
For me it happened only once. I think this is some glitch from the Kotlin plugin, when you first create a Kotlin file and try run it. Try "new Kotlin class" paste the same content and see if it works. After that you should be able to run both files as it happened to me.
I got same issues as you. I tried a lot of ways but not work (like uninstall plugin, then install plugin again, delete project and create new project...)
How to fix: I created a new workspace and setup the helloworld project again. I see that class file generated and I can run it normally.
Note that, we create new workspace and not project. What I notice is workspace contain .metadata folder that may have lot of information for Eclipse.
I had the same problem, it solved by deleting the JAVA_HOME environment variable.
I have set an old JDK folder that I deleted in the JAVA_HOME environment variable.
Tried with Java 8 (1.8.0_144) and Eclipse Oxygen.1a Release (4.7.1a - build id 20171005-1200) with the following plugin versions:
Kotlin 0.8.2.v20170314-0957 org.jetbrains.kotlin.feature.feature.group JetBrains
kotlin-eclipse-policy 0.8.2.v20170314-0957 org.jetbrains.kotlin.policy.feature.group JetBrains
kotlin-weaving-feature 0.8.2.v20170314-0957 org.jetbrains.kotlin.weaving.feature.feature.group JetBrains
Everything worked as expected, without the need to create a separate workspace and/or use Kotlin File
instead of Kotlin Class
:
This worked for me.... If you go to Window -> Show View -> Navigator It shows you more a physical layout of your workspace rather than the logical view by the Package Explorer. Right click the kotlin file with the main function defined and click Run As -> Kotlin Application. Worked for me, though I'd kill to be able to use a regular run config but such is life.....
来源:https://stackoverflow.com/questions/40506227/unable-to-run-kotlin-application-in-eclipse