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javacompiler-constructionlexlexerjflex

Not able to run JFlex generated lexer Java file

So I used JFlex to generate a file called Yylex.java without any problems. When I try to compile it with the command javac Yylex.java, I get 30 errors, originating with this one: 

Yylex.java:13: error: package java_cup.runtime does not exist
import java_cup.runtime.Symbol;

This is obviously caused by the first import in my JFlex file. Since I'm trying to use this with CUP, I read that I need to have the java-cup-11a.jar file and the java-cup-11a-runtime.jar in the same folder as Yylex.java, which I do. Anyone know what's wrong?

Solution

  • Simply putting the jars in the dir is not enough, you have to add them to the classpath using the -cp command line option, so e.g.

    javac -cp ava-cup-11a-runtime.jar Yylex.java