javac -cp $CLASSPATH Xi*.java maybe ?
Raphael
----- Mail original -----
De: "Sam Kuper" <sampabloku...@posteo.net>
À: "ML debian-java" <debian-java@lists.debian.org>
Envoyé: Jeudi 9 Juillet 2020 02:19:10
Objet: javac - error: package org.antlr.v4.runtime does not exist
Dear all,
I apologise in advance for asking what might be an ignorant question,
but it has been ages since I used Java for anything and so my Java
troubleshooting skills are currently rusty/nonexistent.
On a box running Debian Stretch (oldstable), I am trying to compile an
Antlr4 lexer & parser. The first step (generating the lexer & parser
.java files from .g4 files) works fine, but the second step (compiling
the the lexer & parser) does not. Here's the first step:
$ mkdir /tmp/antlr-test
$ cd $_
$ wget --page-requisites --recursive --level=inf --convert-links \
--no-parent \
https://www.cs.cornell.edu/courses/cs4120/2013fa/handouts/antlr.html
$ cd www.cs.cornell.edu/courses/cs4120/2013fa/handouts/xi
$ ls -1
hello.xi
XiLexer.g4
XiParser.g4
$ antlr4 XiLexer.g4 XiParser.g4 -no-listener ; echo $?
0
$ ls -1
hello.xi
XiLexer.g4
XiLexer.java
XiLexer.tokens
XiParser.g4
XiParser.java
XiParser.tokens
All fine so far, as you can see. Now the second step:
$ javac Xi*.java
XiLexer.java:2: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.Lexer;
^
[SNIP - for full output, see attached file.]
100 errors
Oh dear. What to do?
The [Antlr4
FAQ](https://github.com/antlr/antlr4/blob/master/doc/faq/installation.md_
says, "If you see these kinds of errors, it's because you don't have the
runtime or complete ANTLR library in your CLASSPATH."
I installed Antlr4 via `sudo apt install antlr4` and I installed javac
via `sudo apt install default-jdk` so I would hope that Antlr4 is
reachable by javac, but in case not, I tried manually populating the
CLASSPATH environment variable with the same contents found in the
antlr4 executable, before running javac again:
$ cat /usr/bin/antlr4
#!/bin/sh
CLASSPATH=/usr/share/java/stringtemplate4.jar:/usr/share/java/antlr4.jar:/usr/share/java/antlr4-runtime.jar:/usr/share/java/antlr3-runtime.jar/:/usr/share/java/treelayout.jar
exec java -cp $CLASSPATH org.antlr.v4.Tool "$@"
$ CLASSPATH='.'
$ CLASSPATH+=':/usr/share/java/stringtemplate4.jar'
$ CLASSPATH+=':/usr/share/java/antlr4.jar'
$ CLASSPATH+=':/usr/share/java/antlr4-runtime.jar'
$ CLASSPATH+=':/usr/share/java/antlr3-runtime.jar/'
$ CLASSPATH+=':/usr/share/java/treelayout.jar"; javac Xi*.java
XiLexer.java:2: error: package org.antlr.v4.runtime does not exist
import org.antlr.v4.runtime.Lexer;
^
[SNIP - for full output, see attached file.]
100 errors
No improvement :(
So my question is: how can I make the `javac Xi*.java` command succeed,
*without* having to fall back on a non-Debian-provided Antlr4
installation?
(Two examples of non-Debian-provided Antlr4 installation would be: a
.jar produced by me cloning and building
https://github.com/antlr/antlr4; or if I downloaded this .jar:
https://www.antlr.org/download/antlr-4.7.1-complete.jar ).
Thanks in advance for any help you can provide!
Sam
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