avanco commented on a change in pull request #385:
URL: https://github.com/apache/opennlp/pull/385#discussion_r541297605



##########
File path: 
opennlp-morfologik-addon/src/main/java/opennlp/morfologik/lemmatizer/MorfologikLemmatizer.java
##########
@@ -47,7 +47,7 @@ public MorfologikLemmatizer(Dictionary dictionary) throws 
IllegalArgumentExcepti
     dictLookup = new DictionaryLookup(dictionary);
   }
 
-  private List<String> lemmatize(String word, String postag) {
+  private synchronized List<String> lemmatize(String word, String postag) {

Review comment:
       Yes, I tried locking only around `dictLookup`, but the List returned by 
`lookup` method (morfologik code) returns a reference for an object that is 
created only once, maybe for performance reasons, I don't know :(




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