Error in deploying when sync_reasoner_pellet() is used

[Su]

I tried to deploy this code which works in localhost to Heroku. This code runs fine in localhost since java is already installed in my laptop. I think the problem is because there is no java in the application that is deployed. I am not sure how I can add java file. Your suggestion would be really appreciated.


2020-10-29T12:00:06.166858+00:00 app[web.1]: * Owlready2 * Running Pellet...
2020-10-29T12:00:06.166900+00:00 app[web.1]:     java -Xmx2000M -cp /app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/httpclient-4.2.3.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/jena-iri-0.9.5.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/slf4j-api-1.6.4.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/jena-tdb-0.10.0.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/httpcore-4.2.2.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/owlapi-distribution-3.4.3-bin.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/jcl-over-slf4j-1.6.4.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/xml-apis-1.4.01.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/jena-core-2.10.0.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/pellet-2.3.1.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/jgrapht-jdk1.5.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/antlr-3.2.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/xercesImpl-2.10.0.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/log4j-1.2.16.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/jena-arq-2.10.0.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/aterm-java-1.6.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/commons-codec-1.6.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/slf4j-log4j12-1.6.4.jar:/app/.heroku/python/lib/python3.6/site-packages/owlready2/pellet/antlr-runtime-3.2.jar pellet.Pellet realize --loader Jena --input-format N-Triples --ignore-imports /tmp/tmpq7_1mrbv
2020-10-29T12:00:06.172904+00:00 app[web.1]: [2020-10-29 12:00:06,169] ERROR in app: Exception on /webhook [POST]
2020-10-29T12:00:06.172905+00:00 app[web.1]: Traceback (most recent call last):
2020-10-29T12:00:06.172906+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 2447, in wsgi_app
2020-10-29T12:00:06.172906+00:00 app[web.1]:     response = self.full_dispatch_request()
2020-10-29T12:00:06.172907+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1952, in full_dispatch_request
2020-10-29T12:00:06.172907+00:00 app[web.1]:     rv = self.handle_user_exception(e)
2020-10-29T12:00:06.172907+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1821, in handle_user_exception
2020-10-29T12:00:06.172908+00:00 app[web.1]:     reraise(exc_type, exc_value, tb)
2020-10-29T12:00:06.172908+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
2020-10-29T12:00:06.172908+00:00 app[web.1]:     raise value
2020-10-29T12:00:06.172909+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1950, in full_dispatch_request
2020-10-29T12:00:06.172909+00:00 app[web.1]:     rv = self.dispatch_request()
2020-10-29T12:00:06.172909+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1936, in dispatch_request
2020-10-29T12:00:06.172911+00:00 app[web.1]:     return self.view_functions[rule.endpoint](**req.view_args)
2020-10-29T12:00:06.172911+00:00 app[web.1]:   File "/app/app.py", line 36, in webhook
2020-10-29T12:00:06.172911+00:00 app[web.1]:     res = makeWebhookResult(req)
2020-10-29T12:00:06.172912+00:00 app[web.1]:   File "/app/app.py", line 45, in makeWebhookResult
2020-10-29T12:00:06.172912+00:00 app[web.1]:     graph = ConnectOnto()
2020-10-29T12:00:06.172912+00:00 app[web.1]:   File "/app/app.py", line 24, in ConnectOnto
2020-10-29T12:00:06.172913+00:00 app[web.1]:     sync_reasoner_pellet(my_world)
2020-10-29T12:00:06.172913+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/owlready2/reasoning.py", line 245, in sync_reasoner_pellet
2020-10-29T12:00:06.172914+00:00 app[web.1]:     output = subprocess.run(command, stdout = subprocess.PIPE, stderr = subprocess.PIPE, check = True).stdout
2020-10-29T12:00:06.172914+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/subprocess.py", line 423, in run
2020-10-29T12:00:06.172914+00:00 app[web.1]:     with Popen(*popenargs, **kwargs) as process:
2020-10-29T12:00:06.172914+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/subprocess.py", line 729, in __init__
2020-10-29T12:00:06.172915+00:00 app[web.1]:     restore_signals, start_new_session)
2020-10-29T12:00:06.172915+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/subprocess.py", line 1364, in _execute_child
2020-10-29T12:00:06.172915+00:00 app[web.1]:     raise child_exception_type(errno_num, err_msg, err_filename)
2020-10-29T12:00:06.172939+00:00 app[web.1]: FileNotFoundError: [Errno 2] No such file or directory: 'java': 'java'
2020-10-29T12:00:06.174825+00:00 app[web.1]: 10.9.250.56 - - [29/Oct/2020:12:00:06 +0000] "POST /webhook HTTP/1.1" 500 290 "-" "Google-Dialogflow"
2020-10-29T12:32:50.080887+00:00 heroku[web.1]: Idling
2020-10-29T12:32:50.083039+00:00 heroku[web.1]: State changed from up to down
2020-10-29T12:32:54.677566+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2020-10-29T12:32:54.711873+00:00 app[web.1]: [2020-10-29 12:32:54 +0000] [10] [INFO] Worker exiting (pid: 10)
2020-10-29T12:32:54.712645+00:00 app[web.1]: [2020-10-29 12:32:54 +0000] [11] [INFO] Worker exiting (pid: 11)
2020-10-29T12:32:54.713066+00:00 app[web.1]: [2020-10-29 12:32:54 +0000] [4] [INFO] Handling signal: term
2020-10-29T12:32:54.813502+00:00 app[web.1]: [2020-10-29 12:32:54 +0000] [4] [INFO] Shutting down: Master
2020-10-29T12:32:54.889763+00:00 heroku[web.1]: Process exited with status 0

[Jiba]

Hi,

You need to install Java on the server (not sure you can / you have the right for that). Possibly, Java is already installed but not available as "java", and you need to search where it is installed.

Jiba