Error in Stanford Pos Tagger

Question

Hi, I am trying to make a POS tag for a specific sentence using Stanford Pos Tagger. I am using Python 3.4 nltk 3.1 on windows7 The following is the code I used:

import nltk
from nltk.tag.stanford import POSTagger
import os
java_path = r"C:\Program Files\Java\jre1.8.0_66\bin\java.exe"
os.environ['JAVAHOME'] = java_path

St=POSTagger(r"C:\Python34\Scripts\stanford-postagger-2015-12-09\models\english-bidirectional-distsim.tagger",r"C:\Python34\Scripts\stanford-postagger-2015-12-09\stanford-postagger.jar")

tokens = nltk.tokenize.word_tokenize("Sample for tagging a sentence.")
print(St.tag(tokens))

However, I get the following error:

Traceback (most recent call last):
Loading default properties from tagger C:\Python34\Scripts\stanford-postagger-2015-12-09\models\english-bidirectional-distsim.tagger

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory

at edu.stanford.nlp.io.IOUtils.<clinit>(IOUtils.java:42)

at edu.stanford.nlp.tagger.maxent.TaggerConfig.<init>(TaggerConfig.java:146)

at edu.stanford.nlp.tagger.maxent.TaggerConfig.<init>(TaggerConfig.java:128)

at edu.stanford.nlp.tagger.maxent.MaxentTagger.main(MaxentTagger.java:1836)

Called: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 4 more

File "C:\Users\workspace\src\chunking.py", line 15, in <module>
print(St.tag(tokens))
File "C:\Python34\lib\site-packages\nltk\tag\stanford.py", line 59, in tag
return self.tag_sents([tokens])[0]
File "C:\Python34\lib\site-packages\nltk\tag\stanford.py", line 81, in tag_sents stdout=PIPE, stderr=PIPE)
File "C:\Python34\lib\site-packages\nltk\internals.py", line 160, in java     raise OSError('Java command failed!')
OSError: Java command failed!

Please help me resolve this error?

Answer 1

Try adding two more jar files to the two build paths. You will find these files in the lib folder of the downloaded package slf4j-api.jarand slf4j-simple.jar. Check out this tutorial