Antlr4: Hello example not working on Windows after it has been split into separate lexer and parser

[fraschfn]

I had the same issues as in this issue: https://github.com/antlr/antlr4/issues/147 and the fix also worked for me.

I then tried to separate the lexer from the parser and I get an exception when I try to run the TestRig.

file HelloL.g4:

// Define a grammar called Hello
lexer grammar HelloL;

Hello : 'hello' ;
ID : [a-z]+ ;             // match lower-case identifiers
WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines

file HelloP.g4:

// Define a grammar called Hello
parser grammar HelloP;

options { tokenVocab=HelloL; }

r  : Hello ID ;         // match keyword hello followed by an identifier

I then run these commands:

java -cp .;antlr-4.1-complete.jar org.antlr.v4.Tool HelloL.g4
java -cp .;antlr-4.1-complete.jar org.antlr.v4.Tool HelloP.g4

javac -cp .;antlr-4.1-complete.jar Hello*.java

java -cp .;antlr-4.1-complete.jar org.antlr.v4.runtime.misc.TestRig HelloP r -tree sample.txt

I then get this exception:

Exception in thread "main" java.lang.ClassCastException: class HelloP
        at java.lang.Class.asSubclass(Unknown Source)
        at org.antlr.v4.runtime.misc.TestRig.process(TestRig.java:159)
        at org.antlr.v4.runtime.misc.TestRig.main(TestRig.java:143)

Contents of sample.txt

hello parrt

These are the contents of the folder I work in (the batch files contain basically the commands above - but I also tested it directly in the shell):

[parrt]

Try

java -cp .;antlr-4.1-complete.jar org.antlr.v4.runtime.misc.TestRig Hello r -tree sample.txt

w/o the P.

Ter

[fraschfn]

I'm afraid it didn't work:

Can't load Hello as lexer or parser

Since I've split the file "Hello.g4" into "HelloL.g4" (lexer) "HelloP.g4" (parser)
there is no combined grammer "Hello" anymore, only a lexer (HelloL) and a parser (HelloP).

[parrt]

oh right. make it HelloLexer and HelloParser as the names of your items, including the filenames. please don't post questions here.