Editor does not contain a main type

Question

Just going through the sample Scala code on Scala website, but encountered an annoying error when trying to run it.

Here\'s the code: http://www.scala-lang.org/node/

Answer 1

I have this problem a lot with Eclipse and Scala. It helps if you clean your workspace and rebuild your Project.

Sometimes Eclipse doesn't recognize correctly which files it has to recompile :(

Edit: The Code runs fine in Eclipse

Answer 2

One more thing to check: make sure that your source file contains the correct package declaration corresponding to the subdirectory it's in. The error mentioned by the OP can be seen when trying to run a "main type" declared in a file in a subdirectory but missing the package statement.

Answer 3

I had the same problem. I tried all sorts of things. And I came to know that

1. My .java files were not linked and
2. they were not placed in the 'src' folder.

Things I did:

Project properties >> Java Build Path >> Source

• Deleted the original 'src' folder which was empty using 'Remove' option
• Added the source that contained my source .java files using the 'Add Folder' option

This solved the error.

Answer 4

A simpler way is to close the project and reopen it.

Answer 5

Follow the below steps:

1. Backup all your .java files to some other location
2. delete entire java project
3. Create new java project by right click on root & click new
4. restore all the files to new location !!

Answer 6

***

Just close and reopen

*** your project in eclipse. Sometime there are linkage problems. This solved my problem