Japanese Tokenizer (Kuromoji) cannot build UniDic dictionary [LUCENE-4056]

I tried to build a UniDic dictionary for using it along with Kuromoji on Solr 3.6. I think UniDic is a good dictionary than IPA dictionary, so Kuromoji for Lucene/Solr should support UniDic dictionary as standalone Kuromoji does.

The following is my procedure:
Modified build.xml under lucene/contrib/analyzers/kuromoji directory and run 'ant build-dict', I got the error as the below.

build-dict:
[java] dictionary builder
[java]
[java] dictionary format: UNIDIC
[java] input directory: /home/kazu/Work/src/solr/brunch_3_6/lucene/build/contrib/analyzers/kuromoji/unidic-mecab1312src
[java] output directory: /home/kazu/Work/src/solr/brunch_3_6/lucene/contrib/analyzers/kuromoji/src/resources
[java] input encoding: utf-8
[java] normalize entries: false
[java]
[java] building tokeninfo dict...
[java] parse...
[java] sort...
[java] Exception in thread "main" java.lang.AssertionError
[java] encode...
[java] at org.apache.lucene.analysis.ja.util.BinaryDictionaryWriter.put(BinaryDictionaryWriter.java:113)
[java] at org.apache.lucene.analysis.ja.util.TokenInfoDictionaryBuilder.buildDictionary(TokenInfoDictionaryBuilder.java:141)
[java] at org.apache.lucene.analysis.ja.util.TokenInfoDictionaryBuilder.build(TokenInfoDictionaryBuilder.java:76)
[java] at org.apache.lucene.analysis.ja.util.DictionaryBuilder.build(DictionaryBuilder.java:37)
[java] at org.apache.lucene.analysis.ja.util.DictionaryBuilder.main(DictionaryBuilder.java:82)

And the diff of build.xml:

===================================================================
— build.xml (revision 1338023)
+++ build.xml (working copy)
`@@` -28,19 +28,31 `@@`
<property name="maven.dist.dir" location="../../../dist/maven" />

<!-- default configuration: uses mecab-ipadic -->
+ <!--


<!-- alternative configuration: uses mecab-naist-jdic

-
+
+ <!-- alternative configuration: uses UniDic -->
+ <property name="ipadic.version" value="unidic-mecab1312src" />
+ <property name="dict.src.file" value="unidic-mecab1312src.tar.gz" />
+ <property name="dict.loc.dir" value="/home/kazu/Work/src/nlp/unidic/_archive"/>
+
<property name="dict.src.dir" value="${build.dir}/${ipadic.version}" />
+ <!--

+ <property name="dict.encoding" value="utf-8"/>
+ <property name="dict.format" value="unidic"/>
+
<property name="dict.normalize" value="false"/>
<property name="dict.target.dir" location="./src/resources"/>

`@@` -58,7 +70,8 `@@`

<target name="compile-core" depends="jar-analyzers-common, common.compile-core" />
<target name="download-dict" unless="dict.available">
- <get src="${dict.url}" dest="${build.dir}/${dict.src.file}"/>
+ <!-- get src="${dict.url}" dest="${build.dir}/${dict.src.file}"/ -->
+ <copy file="${dict.loc.dir}/${dict.src.file}" tofile="${build.dir}/${dict.src.file}"/>
<gunzip src="${build.dir}/${dict.src.file}"/>
<untar src="${build.dir}/${ipadic.version}.tar" dest="${build.dir}"/>
</target>

---
Migrated from [LUCENE-4056](https://issues.apache.org/jira/browse/LUCENE-4056) by Kazuaki Hiraga (@hkazuakey), updated Oct 16 2019
Environment:
```
Solr 3.6
UniDic 1.3.12 for MeCab (unidic-mecab1312src.tar.gz)
```

Attachments: [LUCENE-4056.patch](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-4056/LUCENE-4056.patch)
Linked issues:
- #9860

Reproduce the failure with ant build-dict using lucene/contrib/analyzers/kuromoji/build.xml and the UniDic 1.3.12 source. Start at BinaryDictionaryWriter.java:113 and TokenInfoDictionaryBuilder.java:141, then inspect the attached LUCENE-4056.patch. Done means the UniDic dictionary builds successfully with the reported configuration and remains compatible with Kuromoji.

Written by the indexing model from the issue text.