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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.

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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.

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  • You should upload it to maven central. Also, from what I can see Jakaroma only exposes transliteration from kana to romaji? What would I go about transliterating kanji to kana or romaji?
    – 0x6C38
    Commented Nov 6, 2016 at 21:32
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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.

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