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Impressive·Tech· Aug 28, 2026 · 9 min

Reviving a 30-Year-Old 'Java Ring' Became a Full-Blown Java Reunion

A college student's obsession with a 1998 wearable computer brought a legendary crew of veteran engineers back together to bring it to life.

Reviving a 30-Year-Old 'Java Ring' Became a Full-Blown Java Reunion

What's going on

A college student in Japan submitted a request to a long-running TV segment where members of the public ask for help with strange, deeply personal problems. His problem: he's obsessed with the programming language Java, holds the highest-level Java certification available, and while collecting Java-related merchandise, he tracked down and bought something called a "Java Ring" through a secondhand marketplace app.

The Java Ring is real, and it's a genuinely strange artifact: a wearable ring containing a tiny embedded computer, handed out at a technology conference back in 1998. Attendees used it to store their profile and coffee preferences, tapping it against readers to check in at the event or order a drink from a connected coffee machine. Three decades later, the student wanted to get his working again, but after importing period-accurate hardware and hooking it up to a PC, nothing happened. He suspected the ring's internal backup battery had simply died after 30 years — a reasonable guess — but the part was sealed tightly inside the casing, far beyond what he could safely open himself.

So the show assembled a team to help: several of the ring's original engineers from back in the day, and, since none of them could risk cracking the casing themselves, a professional model kit builder brought in purely for his steady hands. What followed became less a repair job and more an impromptu reunion of the people who built the future 30 years too early.

Comments

The competent requester casually hacked the Java Ring’s security to get it working right at the very end lol. Feels like this whole crew is gonna hold a “Java Ring Revival Report Meeting” later www
有能依頼者、最後にさり気なくJAVAリングのセキュリティハックして使えるようにしてて、後日この面子で「JAVAリング復活報告会」を開催しそうwww
Thought it was just some quirky request, but it turned into an episode that actually proves a Java legend lol
物好きな依頼やなぁと思ってたら、なんかJavaの伝説を実証する回になってて草
The smart coffee maker they used supports Alexa, Siri, and Google Assistant — bet it never expected to end up being controlled by a 30-year-old device lol
使われてるスマート全自動コーヒーメーカー「Alexa、Siri、Googleアシスタント対応」 まさか30年前のデバイスで動かされると思ってなかっただろうなw
This is the best episode in years, no joke.
数年ぶりに ベストヒットだなこれ
Calling in former company presidents and making them stand for over an hour — that careless energy is so Knight Scoop lol
元社長さん達を呼んで一時間以上立たせる雑さがナイトスクープらしいw
@NaokiRodionIshihara — Official
It was way more than an hour — we were standing for about two hours before the first break.
1時間どころではなく立ってました。最初の休憩まで2時間くらいかな。
Wait, is this really Mr. Ishihara himself!? Thanks for the comment! Great work on the shoot too — even indoors, that sounds pretty rough… I kept thinking they could’ve at least brought out a chair.
石原さんご本人ですか!?コメントありがとうございます!撮影もお疲れ様でした♪ 室内とはいえ中々ハードですね… 椅子ぐらい用意出来るだろうと思いながら見てました
@NaokiRodionIshihara — Official
I kept thinking “it’s about to open any second now,” so I stayed half-crouched the entire time. Honestly got tired partway through, but there was no way we could take a break before Suetsugu-san did 😂
​@sa-Y-to今にも開けれるのではないかと思って、ずっと中腰のままでした。 さすがに途中で疲れたんですけど、末次さんが休まないのに自分たちが先に休むわけにいかなくて😂
This episode was seriously incredible — loved how a skilled requester managed to pull together specialists, plus experts from totally different fields, all working toward one solution.
この回本当にすごかったな 優秀な依頼者の元に専門のメンバーが集まって別分野の識者もきて解決に向かっていたの面白かった
I love watching people get hyped over stuff that only makes sense to people who actually get it.
こういうわかる人にしかわからないことで興奮する人達見るの好き
Smart rings are only just reaching the mainstream now, but Sun Microsystems was building this stuff 30 years ago. Wild. (Sun Microsystems was the computing company that created Java; it was later absorbed into Oracle.)
スマートリング今やっと一般向けに出てきたけど、それを30年前から作ってたサン・マイクロシステムズ凄すぎ
Bold of network TV to run this — the content is basically built for YouTube.
地上波で、これを扱った勇気 完全にYouTube向きの内容
Getting miniaturization this far back in the ’90s — that’s the dream right there.
90年代にここまでの小型化が実現できてたの夢あるな
Kemu doing a proper job of playing “the guy who doesn’t quite get it” — love that.
ケムがちゃんとよくわかってない人の仕事しててすこ
For them, this was probably a way more meaningful experience than viewers could even imagine.
彼らからすると視聴者の想像以上に有意義な体験だったんだろうなあ
Coming up with the idea of packing an authentication system into a ring 30 years ago — and actually pulling it off — is just incredible.
30年前に指輪のサイズで認証システムを搭載すると考えて実現させたのは凄いな…
Honestly, this episode works great as a piece of historical documentation.
普通に資料として優秀な回だった
The fact that it was a professional model kit builder who opened the ring adds serious style points lol
リングを開けたのがプロモデラーってのも芸術点が高いw
Even as a total layman, I could tell this was “apparently” something amazing.
なんかスゴイこと”らしい”のは素人にも伝わった
The “Java Avengers” lighting up like little kids got me right in the feels.
Javaアベンジャーズの少年のような顔に感動した
Seeing a lineup of veteran engineers as a fellow engineer got me so hyped. That line “if you see an old-timer, assume they’re a survivor” just became real.
エンジニアとしてベテランが並ぶのを見てめっちゃテンション上がった 「老いぼれを見たら生き残りと思え」のセリフが現実になってる
Honestly, the guest lineup is way too stacked. It’s like Nomura personally showing up for some random regional baseball kid’s request. (Hideo Nomo is a legendary Japanese pitcher who went on to play in Major League Baseball.)
てかゲストが豪華すぎる。 地方の野球部員のために野茂が来てくれたくらいある。
The request suddenly getting way too technical is somehow hilarious.
急に技術的すぎる依頼でなんかおもろい
If they put out an English version of this, wouldn’t it go massively viral?
これ英語版出したらめっちゃバズったりしないかな
The “Kayoko” mentioned in the video description has me way too curious, but there’s no video for that one — so frustrating wwww
概要欄のカヨコめちゃくちゃ気になるのにそっちは動画なくてもどかしいwwww
If this got sent out to overseas audiences too, it feels like it’d become a huge topic.
これ海外にも発信したらめちゃくちゃ話題になりそうだな
Really shows the skill of a craftsman — such a clean, sharp technique.
さすがマツダの職人やな、鮮やかな手際でした。
That ending reminded me the Java logo is literally a coffee cup.
最後でJavaのロゴがコーヒーやったことを思い出した
So the whole thing is a pun on the Java icon being a coffee cup.
Javaのアイコンはコーヒーカップだからそれに掛けてるのね
The video description talks about something completely different lol
概要欄の内容全く違うくて草
Archiving this before they fix it: “[Bring back the legendary Java Ring]” — from a woman in Osaka (33). She’s been living with a strange, slightly sad situation for six or seven years and wanted someone to hear about it. One day an elderly man she didn’t know called out of nowhere, and when she picked up, he said, “…Kayoko?” She told him, “No, sorry, I’m not Kayoko,” but the calls kept coming, over and over — more than a hundred times by now. From what she can tell, her current phone number used to belong to a woman named Kayoko. She kept explaining “I’m not Kayoko,” but after such a long stretch of this, there were times she found herself answering as if she were Kayoko. When she did, the man’s voice would go a little lonely and he’d murmur, “Kayoko… you didn’t die on me, did you?” After seven years of him calling the same number looking for Kayoko, she started to grow curious about who he actually was. She doesn’t know his face, his age, or his real name. But after hearing that elderly man’s voice for seven years, she’s come to want to meet him, tell him about Kayoko, apologize for the lie of pretending to be her, and maybe become real friends going forward. She does have his number, so technically she could go alone — but she feels guilty about the lie, and honestly, showing up alone to meet a strange man is scary. So her request was: please come with me.
そのうち修正されそうなので魚拓 【伝説のJavaリングを復活させて】 大阪府の女性(33)から。6、7年前から続いている、少し不思議で、どこか切ない話を聞いてもらいたく応募した。ある日突然、知らない年配の男性から電話がかかってきて、電話に出ると「…カヨコか?」。私は「違いますよ。カヨコさんじゃないです」と伝えても、何度も何度も電話がかかってきて、その間違い電話は100回以上続いている。話を聞いていると、どうやら私の今の電話番号は、昔カヨコさんという女性が使っていた番号だったようだ。「私はカヨコさんではない」と説明し続けていたが、あまりにも長い付き合いになってしまって、たまにカヨコさんみたいに返事をしてしまったこともある。そうすると少し寂しそうな声で「カヨコ、お前死んだんちゃうんか」とポツリ。7年間も同じ番号に電話をかけ続け、カヨコさんを探しているその人のことが、段々気になるようになった。私はその人の顔も、年齢も、本名も知らない。でも7年間、その年配男性の声を聞き続けているうちに、会ってカヨコさんとの話を聞いてみたい、「私はカヨコさん」と嘘をついたことを謝り、これからも友だちとして仲良くなりたいと思うようになった。もちろん電話番号は知っているので、その気になれば自分一人でも会いに行けるかもしれないが、嘘をついてしまった罪悪感もあるし、知らない男性のところへ一人で行くのは正直こわい。だから、一緒に来て欲しい、というもの。
Turns out it’s actually the request from a completely different segment that aired the same day lol
同じ放送日の別の依頼内容になってるね笑
The engineers crossing their fingers and waiting for the result — so heartwarming.
技術者がフィンガークロスして結果を待つの胸熱
This reminded me that I actually knew about the Java Ring back then, from seeing it covered in magazines. It didn’t click for me at the time at all, but watching this finally made me understand what it was and what it did. Getting a glimpse into everyone’s feelings, skills, and experience — the original team from back then, the college student determined to get it working, and the model builder taking it apart — 30 years later, was genuinely interesting.
当時、Javaリングが雑誌などで取り上げられているのを見て知っていたのを思い出した。 その時は全くピンときてなくてこれを見て何をやっていてどういうモノかが分かって30年後 にやっている事と当時の関係者、作動させたい大学生、それを分解するモデラーの人のそれぞれ の思いや技術、経験が垣間見えて面白かった。
Ishihara-san, who’d been pretty stone-faced the whole time, teared up a little the moment it said SUCCESS — that got me.
基本的に無表情だった石原さんがSUCCESSの瞬間にちょっと泣いているのに感動しました。
I figured even if the coffee never came out, that would still prove the Java Ring’s security was properly working — a discovery of the century either way~… and then at the end he just goes and hacks it to actually make the coffee happen, and I fell over backwards. Who even are you, requester…?
仮にコーヒーが出なかったとしても、それはそれでちゃんとJavaリングのセキュリティが働いている証明になるから、世紀の大発見なんやな〜 ...って思ってたら最後にちゃんとハッキングしてコーヒー出せるようになってて後頭部からひっくり返った。依頼者てめぇ何者や...?
I love the “battle-worn veteran” energy from the people who worked on it back then showing up. Really hope this reaches an overseas audience somehow — honestly, they’d probably get even more hyped than we did.
当時の方々が出てきた時の歴戦の老兵感めっちゃ好き これなんとか海外にも届いてほしいわ、むしろ向こうのほうが興奮するだろ
@NaokiRodionIshihara — Official
Actually, before filming, I ran this whole thing by people from Sun’s head office back in the day. I got messages from the Java Ring team’s manager at the time, Miko Matsumura — who did the original Java Ring stage demo — and Tim Lindholm, who basically ran Java ME. Everyone’s genuinely moved and grateful toward Yamazaki-kun. Also, purely by coincidence, a documentary about Java was apparently being filmed in the US around the same time, and it looks like it came out just last week.
実は撮影前にこの件を当時の Sun 本社の人たちに相談していまして、当時の Java Ring チームのマネージャーや、Java Ring のデモをステージで行った Miko Matsumura, Java ME の親玉、Tim Lindholm からはメッセージをもらっています。みんな山﨑さんに感謝感激ですよ。 なお偶然ですが、アメリカでも同時期に Java のドキュメンタリーが撮影されてまして、先週公開されたようてす。
This is exactly the kind of episode Knight Scoop is about — it’s lovely seeing a young person take center stage like this.
これぞナイトスクープの回 こうやって若い人が主役になるの素敵だなー
This is a product born from the dreams of the IT revolution era around the 2000s. Genuinely moved. Also nice seeing a bunch of clearly knowledgeable people in the comments.
2000年前後のIT革命時代の夢が作った代物だなあ 感動した コメ欄も詳しそうな人がちらほらいるのが良い
I recall that afterward, in the studio talk, they mentioned that originally, tapping the ring only sent an automatic order through to the kitchen — and that what he built is actually even more impressive than that. Feels like a pretty essential side note that almost got cut lol
たしかこのあと、当時はリングをピッてしたら、キッチンに自動オーダーが通る仕組みだけで、彼はもっとすごいって話してたっけな。あのスタジオでの話かなり必要な余談なのにw
Quietly shocked it’s already 30 years ago 😂 That was the era when companies were terrified of the Y2K bug and scrambling to hire systems engineers… even humanities students learned programming for the first time right after graduating, then got sent out to client sites late at night. Missing the last train home was just normal back then.
もう30年前なのが地味にショック😂 2000年問題に戦々恐々として企業がこぞってSEを雇った時代… 文系学生も大学卒業してから初めてプログラミングを学んで、深夜に客先でに行ったり。あの頃は終電あたりまえだった。
The soul of Sun lives on, right here…
Sunの魂は、今もここに…
I had no idea something this amazing existed 30 years ago. If it weren’t for Detective! Knight Scoop, I might never have found out at all 🤔
30年前にこんな素晴らしい物が出てたとは知りませんでした。 探偵ナイトスクープが無ければずっと知らずに居たかも🤔

My take

So wearables were already a real thing 30 years ago? Guess that's exactly what you get from a language with a history as long as Java's.
Source & translation note

Comments loosely translated for tone. Reactions collected from Togetter and X threads.

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