John Tyler wrote:
> Hello, I'm trying to verify some behavior I've seen. I defined a file
> MyApp.scala as such:
> class MyApp {
> // blah
> }
>
> object MyApp {
> def main(args: Array[String]) {
> val app = new MyApp
> // blah
> }
> }
>
> I then compiled with "scalac MyApp.scala", but when I run with "scala
> MyApp" from the same directory I get:
> java.lang.NoSuchMethodException: MyApp.main([Ljava.lang.String ;)
You might choose to explicitly declare that def main returns type Unit
But the problem you are hitting is that you have both a class MyApp and
an object MyApp. main won't work in such cases. Rename the class MyApp
and you'll be fine. You'll see that object MyApp compiles to
MyApp.class and MyApp$.class while class MyApp also compiles to
MyApp.class - a collision. Class MyApp dominates instead of there being
a merge (which might be hard with incremental compiling, separate
compiling, etc).
