JavaOne – you got your browser in my virual machine

“You got your Browser in my virtual mchine! Leveraging sophisticated browser programming modes in your Java applicaion”

Speaker: Ean Schuseller

For more blog posts from JavaOne, see the table of contents

He started by showing a video of the Sophia (and Einstein) robots. They look surpisingly humanoid. Not the video but this is the robot. Relevant in that we need better interfaces than have now. Future: “that was the best customer service person; very patient and immune to me getting angry”

Web Extensions

  • Plugin for browser
  • Needed to use C in the past
  • Browser agnostic APIs
  • Write in JavaScript
  • Have access to browser components like history and open pages
  • Works on Firefox, Chrome, Opera and Edge. Works a bit different on Edge” [not safari yet]
  • Contains manifest.json, html and javascript code for UI, background js (runs when browser opens and state stays until close browser) and content js (what see)

Isomorphic Apps

  • Code that can run on both client and server
  • Ex: Validation logic, business logic

JavaScript in your server
Nashorn is faster in Java 9
[glad I wrote the “throwaway” chapter on Nashorn for our book. Learned a lot]


  • WebWorkers –
    Don’t want intensive logic in main UI thread. WebWorker runs message/task in background.
  • indexedDB transactional persistent data store

It takes a lot to get users to install an app because of trust. Web/online mobile “apps” continue to grow as get more powerful. Will need to have reall good reason to have an app. [irony wih the JavaOne conference app?]

Evolution in JavaScript
Frameworks, immutables reactive, functional programming, etc. Lots of ibraries. Now that more mature, Java can cherry pick from JavaScript.


    React – UI model from Facebook. Very data intensive programming
  • Reducers – Virtual DOM is rerendered based on state change and then diffed against real DOM
  • Redux – extends to single immmutable state. reducer functions “modify” state
  • Helps debugging/testing because can replay actions from older state. Also helps with undo because can just go back a few states

Filter Bubble

  • Cognitive bias from friends, reading, etc. Disagreeable facts never reach us
  • Social networks and search enginges feed us information they think we will like. Not even concious of the bias. Disparity – they know more than you about what you see
  • You trust your spam filter – it controls whether you see a message
  • Filter Bubble web extension – determines where you spend time so you know too. Uses word frequency analysis

My take: Nice to see Oracle is open minded about having JavaScript content at JavaOne. There was even a bit of Java in this talk. Good first session. A mix of things that I didn’t know, things that I knew at one point and forgot. Plus some things I know. Happy to start the day with learning!

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