Date of First Response: 2009-09-10 00:57:03
Help Desk Ticket Reference: https://jira.jboss.org/jira/browse/JBRULES-1970
securitylevel_name: Public

In Drools 4.0.7 and 5.0.0M5 it was possible to generate linebreaks using \n in an dsl-File.
Since 5.0.0 CR1 this is no longer possible: the \n is simply converted to the letter n which leads to compile-errors concerning the replaced code.

Example DSL:
# Test linebreak-bug since 5.0.0 CR1
[*][]only a simple test = System.out.println \n ("Did it generate a line break?");


Example DSLR:
#created on: 12.03.2009
package linebreak
expander linebreakbug.dsl
rule "line break bugtest"
  when
    #conditions
  then
  only a simple test
end


This leads to the line
System.out.println n ("Did it generate a line break?");


Maybe this bug is related to https://jira.jboss.org/jira/browse/JBRULES-1970 where the handling of #-Characters in DSL-Files had been fixed.

In my special case I'v got an workaround, but that's no workaround for anyone:
Using one DSLR I generate 2 Outputs:
a) using DSLR with dsl-file-A leads to "DLR"-Code: I don't need line breaks here (today, but maybe next month?)
   I don't care if the generated Code is nice or not and if the line is long or not.
   The code works and is executed by the rules-engine. Everything fine here.
  
b) using DSLR with dsl-file-B leads to programming-code in another programming-language. This Code is never executed in Drools, it is simply generated.
The result is taken an copied into the target-system. For that task I have written an own plugin that does that stuff and works like a little post-processor.
So my workaround is to use my own "keyword" $CRLF in an DSL-File and - after the generation that Drools does - replaced that with "\n".
Not where nice but simple...