A project I just started working on uses JFlex, and when I try and compile the project using ant, I get the following error:
java.lang.NoSuchMethodError: java_cup.runtime.lr_parser.getSymbolFactory()Ljava_cup/runtime/SymbolFactory
What's causing this? I have the JFlex jar downloaded, and am using it in my project.
Turns out to use the jflex ant tasks, you need to download JFlex from here, unzip it somewhere, then copy the jflex-1.6.1/lib/* files to your ant/lib/ folder, and try again.
I had the same problem when using both JFlex.jar and cup_v10k.jar in the same project in IntelliJ.
The problem lied in the cup_v10k.jar, where the java_cup.runtime.lr_parser class also exists, and the method getSymbolFactory() does not exist in that class.
IntelliJ didn't know which jar to trust when searching for the lr_parser class, and chose the lexicographically first jar - cup_v10k.jar.
My solution/hack was to rename the cup_v10k.jar to something lexicographically after JFlex.jar, for example zcup_v10k.jar. IntelliJ was then able to find the right lr_parser class.
