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Editorial Team
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Asked: 2026-05-11T22:25:23+00:00

I’m writing a parser for a very simple grammar in javacc. It’s beginning to

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I’m writing a parser for a very simple grammar in javacc. It’s beginning to come together but at the moment I’m completely stuck on this error:

    ParseException: Encountered "" at line 4, column 15.
Was expecting one of:

The line of input in question is z = y + z + 5

and the production that is giving me problems is my expression which get called from
varDecl():

<ID> <EQL> expression()

Expression looks like this:

        <VAR> (<PLUS> expression())?| <NUM> (<PLUS> expression())? 
        | call() (<PLUS> expression())?

I’m at a loss as to why I’m getting this error – any insight would be greatly appreciated.

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1 Answer

  1. Editorial Team

    Hm, yes, that’s not a very helpful error from JavaCC. What version of JavaCC are you using?

    Also, it’s difficult to troubleshoot these problems without seeing the full grammar… and although I understand you might not be in a position to post that.

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