Java library to transform kanji/katakana/hiragana to romaji

Question

The Japanese language is mostly a combination of 3 alphabets, and it can be transliterated to romaji (Latin script). There are various strategies, Revised Hepburn would be ideal here.
Example: ローマ字 → rōmaji
Requirements:

100% pure Java library
Compatible with GNU-GPLv3

Such a library will most probably need to embed a lot of data to guess the pronunciations correctly as often as possible.

Nicolas Raoul · Answer

Jakaroma does this, and it is based on Kuromoji which is much better at kanji transliteration than Kakasi and even Mecab.

100% Java
Open source: Apache 2 license
Size: 11 MB
Transliteration quality: High

Disclaimer: Maintained by me.

Nicolas Raoul · Answer

Kakasi Java does exactly this.
It also includes a command-line tool so that you can easily try it.

100% Java
Open source: GNU-GPLv2 license
Size: 3.2 MB
Transliteration quality: Poor

Disclaimer: Maintained by me.
Note: Mecab is more accurate at guessing pronunciations but is not 100% Java unfortunately.

Java library to transform kanji/katakana/hiragana to romaji

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