install failed

[mingyueliang]

After install antlr4-tools, run antlr4 failed in cmd.
$ antlr4
Could not get latest version number, attempting to fall back to latest downloaded version...
Traceback (most recent call last):
File "C:\Python38\lib\urllib\request.py", line 1354, in do_open
h.request(req.get_method(), req.selector, req.data, headers,
File "C:\Python38\lib\http\client.py", line 1255, in request
self._send_request(method, url, body, headers, encode_chunked)
File "C:\Python38\lib\http\client.py", line 1301, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "C:\Python38\lib\http\client.py", line 1250, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "C:\Python38\lib\http\client.py", line 1010, in _send_output
self.send(msg)
File "C:\Python38\lib\http\client.py", line 950, in send
self.connect()
File "C:\Python38\lib\http\client.py", line 1417, in connect
super().connect()
File "C:\Python38\lib\http\client.py", line 921, in connect
self.sock = self._create_connection(
File "C:\Python38\lib\socket.py", line 808, in create_connection
raise err
File "C:\Python38\lib\socket.py", line 796, in create_connection
sock.connect(sa)
TimeoutError: [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Python38\lib\site-packages\antlr4_tool_runner.py", line 26, in latest_version
with urlopen(f"https://search.maven.org/solrsearch/select?q=a:antlr4-master+g:org.antlr") as response:
File "C:\Python38\lib\urllib\request.py", line 222, in urlopen
return opener.open(url, data, timeout)
File "C:\Python38\lib\urllib\request.py", line 525, in open
response = self._open(req, data)
File "C:\Python38\lib\urllib\request.py", line 542, in _open
result = self._call_chain(self.handle_open, protocol, protocol +
File "C:\Python38\lib\urllib\request.py", line 502, in _call_chain
result = func(*args)
File "C:\Python38\lib\urllib\request.py", line 1397, in https_open
return self.do_open(http.client.HTTPSConnection, req,
File "C:\Python38\lib\urllib\request.py", line 1357, in do_open
raise URLError(err)
urllib.error.URLError: <urlopen error [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to re
spond>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Python38\lib\runpy.py", line 194, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Python38\lib\runpy.py", line 87, in run_code
exec(code, run_globals)
File "C:\Python38\Scripts\antlr4.exe_main.py", line 7, in
File "C:\Python38\lib\site-packages\antlr4_tool_runner.py", line 131, in tool
args, version = get_version_arg(args)
File "C:\Python38\lib\site-packages\antlr4_tool_runner.py", line 123, in get_version_arg
version = latest_version()
File "C:\Python38\lib\site-packages\antlr4_tool_runner.py", line 36, in latest_version
version_dirs = list(filter(lambda directory: re.match(r"[0-9]+.[0-9]+.[0-9]+", directory), os.listdir(mvn_repo)))
FileNotFoundError: [WinError 3] The system cannot find the path specified: 'C:\Users\mliang2x\.m2\repository\org\antlr\antlr4'

Is there any solution?

[parrt]

That is very strange. I thought that we had set it up so that it looked locally if you could not use the net. @kleinesfilmroellchen any ideas?

[kleinesfilmroellchen]

As far as I can tell, there's both no internet and no old local install. The location looks correct.

[kleinesfilmroellchen]

To detail: The tools can work under one of these conditions:

• The internet is reachable. (Seems to not be the case given the first exception.)
• The local mvn_repo directory already contains an old ANTLR install that was previously downloaded by the tool. (Seems to not be the case; the antlr4 folder and/or its parents do not exist.)
  Therefore, I think this is user error, and I would first try to figure out why the tool cannot download ANTLR.