java expressions with binary operators in xbase not working

Question

I'm using xbase

grammar xolang.Xolang with org.eclipse.xtext.xbase.Xbase

and an

XBlockExpression

where I expect to write my code

When write an expression like

val c = 1 + 1

Then I get the following error

The method +(int) is undefined

The same happens with Strings. In fact it happens with every binary operator: ==, < , >, ... Now I know that xbase supports operator overloading, maybe that has something to do with it? (Maybe I still have to define somewhere that you can add numbers?)

Answer 1

I solved my problem.

You need to add the xbase.lib jarfile (the right version of course) to the buildpath of the project that uses your DSL.

Answer 2

If you wonder how you can easily add the xbase lib in Eclipse: Right Click on your Project that makes use of your DSL, select Build-Path->Add Libraries and choose XTend Library. The XTend Library includes the correct XBase Lib.