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I use Python 3.6 on Azure Jupyter notebooks on a win8.1 64x for my NLP projects. I was trying to install the Stanford NER Tagger. I downloaded java and all three components

1) stanford-ner-2015-12-09,
2) stanford-parser-full-2018-10-17,
3) stanford-postagger-2015-12-09,

and uploaded these three to my directory on Azure Jupyter notebooks. To test the Stanford NER Tagger, I ran the following codes as suggested on https://pythonprogramming.net/named-entity-recognition-stanford-ner-tagger/

# -*- coding: utf-8 -*-

from nltk.tag import StanfordNERTagger
from nltk.tokenize import word_tokenize

st = StanfordNERTagger('/usr/share/stanford-ner/classifiers/english.all.3class.distsim.crf.ser.gz',
 '/usr/share/stanford-ner/stanford-ner.jar',
 encoding='utf-8')

text = 'While in France, Christine Lagarde discussed short-term stimulus efforts in a recent interview with the Wall Street Journal.'

tokenized_text = word_tokenize(text)
classified_text = st.tag(tokenized_text)

print(classified_text)

but I received the below Lookup Error, which basically suggests setting variable on CLASSPATH. I installed many packages on Azure Jupyter notebooks before but this is the first time asked to set CLASSPATH environment. I went thru the available documents online but unfortunately nobody addressed this issue for Azure Jupyter environment so far. I appreciate your help.

---------------------------------------------------------------------------
LookupError Traceback (most recent call last)
<ipython-input-7-b3696afa5972> in <module>
 4 from nltk.tokenize import word_tokenize
 5 
----> 6 st = StanfordNERTagger('stanford-ner.jar',encoding='utf-8')
 7 
 8 text = 'While in France, Christine Lagarde discussed short-term stimulus efforts in a recent interview with the Wall Street Journal.'

~/anaconda3_501/lib/python3.6/site-packages/nltk/tag/stanford.py in __init__(self, *args, **kwargs)
 178 
 179 def __init__(self, *args, **kwargs):
--> 180 super(StanfordNERTagger, self).__init__(*args, **kwargs)
 181 
 182 @property

~/anaconda3_501/lib/python3.6/site-packages/nltk/tag/stanford.py in __init__(self, model_filename, path_to_jar, encoding, verbose, java_options)
 61 self._JAR, path_to_jar,
 62 searchpath=(), url=_stanford_url,
---> 63 verbose=verbose)
 64 
 65 self._stanford_model = find_file(model_filename,

~/anaconda3_501/lib/python3.6/site-packages/nltk/__init__.py in find_jar(name_pattern, path_to_jar, env_vars, searchpath, url, verbose, is_regex)
 719 searchpath=(), url=None, verbose=False, is_regex=False):
 720 return next(find_jar_iter(name_pattern, path_to_jar, env_vars,
--> 721 searchpath, url, verbose, is_regex))
 722 
 723 

~/anaconda3_501/lib/python3.6/site-packages/nltk/__init__.py in find_jar_iter(name_pattern, path_to_jar, env_vars, searchpath, url, verbose, is_regex)
 714 (name_pattern, url))
 715 div = '='*75
--> 716 raise LookupError('nn%sn%sn%s' % (div, msg, div))
 717 
 718 def find_jar(name_pattern, path_to_jar=None, env_vars=(),

LookupError: 

===========================================================================
 NLTK was unable to find stanford-ner.jar! Set the CLASSPATH
 environment variable.

 For more information, on stanford-ner.jar, see:
 <https://nlp.stanford.edu/software>