CongoCC Error after Local Build

wfgilreath

Hello all:

I have been using the CongoCC compiler-compiler in a language project. Before now, successfully. But I wanted to implement a new scanner, and thus did a GitHub fork/copy/download and build. I opted to test on the JavaLexer.ccc example, but go this error. I'm running on an Intel MacBook Pro, with 64G memory.

So some glitch or defect during the build process. Just a FYI.

Best, William Gilreath
https://www.wilgil.me

Here's the terminal output...

~/JavaCC/congo>java -jar congocc.jar JavaLexer.ccc

CongoCC Parser Generator (congocc.jar built by williamgilreath on 2026-07-25)
Go to https://discuss.congocc.org for more information.
(type "java -jar congocc.jar" with no arguments for help)

Exception in thread "main" java.io.FileNotFoundException: JavaLexer.ccc:355:1
at org.congocc.core.Grammar.include(Grammar.java:183)
at org.congocc.parser.CongoCCParser.GrammarInclusion(CongoCCParser.java:13138)
at org.congocc.parser.CongoCCParser.Root(CongoCCParser.java:766)
at org.congocc.core.Grammar.parse(Grammar.java:171)
at org.congocc.app.Main.mainProgram(Main.java:289)
at org.congocc.app.Main.main(Main.java:266)

revusky

Hi. Thanks for the feedback.

The error you're running into more or less contains the answer to your question actually. It says that it is not finding the file specified on JavaLexer.ccc line 355. That is right here: https://github.com/congo-cc/congo-parser-generator/blob/master/examples/java/JavaLexer.ccc#L355

That line 355 is:

  INCLUDE "JavaIdentifierDef.ccc"

Apparently, you copied the JavaLexer.ccc to some directory and did not copy the JavaIdentifier.ccc file. The simplest solution is just to comment out line 355 and uncomment line 354, which is:

 INCLUDE JAVA_IDENTIFIER_DEF

The subtle difference between the two lines is that JAVA_IDENTIFIER_DEF is one of the various aliases you can use to include certain files that are just available in the jarfile. So you don't need that file to be on your file system. It just fishes it out of the jar. In fact, I just changed my own copy so that line 355 is commented and 354 uncommented and that will be in the next commit.

I may also shortly address this issue that John Bradley filed some months ago: https://github.com/congo-cc/congo-parser-generator/issues/233 I did not think much about that because I thought that the exception that bubbled up was clear enough, but apparently not.

But anyway, the above should resolve your problem. I hope so anyway.

Regards,

Jon Revusky