Jim Ferenczi created LUCENE-8584:
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             Summary: Japanese UserDictionary should remove duplicate entries
                 Key: LUCENE-8584
                 URL: https://issues.apache.org/jira/browse/LUCENE-8584
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Jim Ferenczi


The Japanese's UserDictionary in the kuromoji module fails to load the 
dictionary if the file contains duplicate entries:

{noformat}
java.lang.UnsupportedOperationException
        at 
__randomizedtesting.SeedInfo.seed([C340BE6DB5DF33E8:A804576E05DF86DF]:0)
        at org.apache.lucene.util.fst.Outputs.merge(Outputs.java:97)
        at org.apache.lucene.util.fst.Builder.add(Builder.java:445)
        at 
org.apache.lucene.analysis.ja.dict.UserDictionary.<init>(UserDictionary.java:135)
        at 
org.apache.lucene.analysis.ja.dict.UserDictionary.open(UserDictionary.java:81)
        at 
org.apache.lucene.analysis.ja.TestJapaneseTokenizer.readDict(TestJapaneseTokenizer.java:55)
        at 
org.apache.lucene.analysis.ja.dict.UserDictionaryTest.testLookup(UserDictionaryTest.java:30)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
{noformat}

Duplicate entries should be ignored or a more descriptive error should be 
thrown.



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